{ "title": "Baseline CDSL Seed Design", "variant_label": "baseline CDSL seed", "summary_label": "Baseline CDSL seed", "summary_search_sentence": "This baseline is fixed by request and was not chosen by the optimizer; the full candidate search is shown only as context.", "asset_slug": "juan-baffleless-cdsl-baseline", "search_results_href": "juan-baffleless-cdsl/candidate_search_results.json", "generated_at_utc": "2026-05-21T21:53:32+00:00", "input_hdf5": { "juan_baffleless": "output/data/polar_data_juan_baffleless.h5", "lx521_system": "output/data/polar_data_lx521_system.h5", "synthetic_output": "output/data/polar_data_juan_cdsl_baseline_synthetic.h5" }, "measurement_conditions": { "gate_left_ms": 0.5, "gate_right_ms": 3.0, "smoothing": 0, "smoothing_str": "None" }, "frequency_grid_hz": { "min": 70.0, "max": 20000.0, "points": 1200 }, "angles_degrees": [ 0, 15, 30, 45, 60, 75, 90 ], "xc_configuration": { "ipsi_angle": 43.6, "contra_angle": 45.8, "ipsi_angle_deg": 43.6, "contra_angle_deg": 45.8, "metric": "SPL43.6 - SPL45.8", "ideal_cosine_dipole_separation_db": 0.33, "geometry": { "speaker_to_ipsi_ear_cm": 127.0, "speaker_to_contra_ear_cm": 140.0, "ear_spacing_cm": 14.0, "speaker_to_listener_tilt_deg": 23.5 } }, "target_spl_db": 76.0, "crossovers": [ { "frequency_hz": 200.0, "type": "LR4", "order": 4, "low_driver": "L26RO4Y", "high_driver": "L22MG (nude)" }, { "frequency_hz": 800.0, "type": "LR4", "order": 4, "low_driver": "L22MG (nude)", "high_driver": "GRS PT6816" }, { "frequency_hz": 2500.0, "type": "LR4", "order": 4, "low_driver": "GRS PT6816", "high_driver": "ND25FW4 (nude 18mm)" } ], "search": { "candidate_count": 54504, "candidate_export_count": 0, "score_direction": "lower is better", "selection": { "method": "fixed baseline seed", "reason": "This baseline is fixed by request and generated with the same gain, delay, mixed-order LR, and sparse flat-EQ process as the chosen design.", "fallback_used": false }, "selected_candidate": { "score": 12.7607, "drivers": [ "L26RO4Y", "L22MG (nude)", "GRS PT6816", "ND25FW4 (nude 18mm)" ], "xovers": [ 200.0, 800.0, 2500.0 ], "xover_orders": [ 4, 4, 4 ], "xover_types": [ "LR4", "LR4", "LR4" ], "ways": 4, "dipole_front_rms_db": 1.895, "dipole_rear_rms_db": 1.817, "null_penalty_db": 0.95, "rear0_rms_db": 1.352, "xover_mismatch_rms_db": 9.038, "validity_penalty": 0.0, "prior_penalty": 1.79, "biquad_budget_penalty": 0.0, "known_effective_thd_2_7_percent": 0.0, "known_thd_coverage_2_7": 0.0, "thd_penalty": 0.087, "hf_polar_ridge_db": 0.0, "hf_polar_slope_excess_db_per_oct": 76.924, "hf_polar_transition_penalty": 1.923, "max_biquads_per_driver_limit": 15, "max_crossover_biquads_per_driver": 8, "max_possible_biquads_per_driver": 14, "total_flat_eq_slots": 34, "total_flat_eq_candidates": 15, "flat_eq_candidate_shortfall_total": 0, "flat_eq_slots_by_driver": { "L26RO4Y": 11, "L22MG (nude)": 9, "GRS PT6816": 7, "ND25FW4 (nude 18mm)": 7 }, "flat_eq_candidate_shortfall_by_driver": { "L26RO4Y": 0, "L22MG (nude)": 0, "GRS PT6816": 0, "ND25FW4 (nude 18mm)": 0 }, "crossover_biquads_within_limit": true, "ipsi_angle": 43.6, "contra_angle": 45.8, "ipsi_angle_deg": 43.6, "contra_angle_deg": 45.8, "xc_ideal_separation_db": 0.33, "xc_separation_median_2_10k_db": 0.399, "xc_separation_p10_2_10k_db": 0.327, "front_ipsi_median_2_10k_db": -4.361, "sep_30_60_median_2_10k_db": 0.399, "sep_30_60_p10_2_10k_db": 0.327, "front30_median_2_10k_db": -4.361, "balanced_rank": 0, "finalist_role": "Baseline fixed seed", "note": "Requested baseline: L26RO4Y below 200 Hz, L22MG 200-800 Hz, GRS 800-2500 Hz, ND25FW above 2500 Hz." }, "finalists": [ { "score": 12.7607, "drivers": [ "L26RO4Y", "L22MG (nude)", "GRS PT6816", "ND25FW4 (nude 18mm)" ], "xovers": [ 200.0, 800.0, 2500.0 ], "xover_orders": [ 4, 4, 4 ], "xover_types": [ "LR4", "LR4", "LR4" ], "ways": 4, "dipole_front_rms_db": 1.895, "dipole_rear_rms_db": 1.817, "null_penalty_db": 0.95, "rear0_rms_db": 1.352, "xover_mismatch_rms_db": 9.038, "validity_penalty": 0.0, "prior_penalty": 1.79, "biquad_budget_penalty": 0.0, "known_effective_thd_2_7_percent": 0.0, "known_thd_coverage_2_7": 0.0, "thd_penalty": 0.087, "hf_polar_ridge_db": 0.0, "hf_polar_slope_excess_db_per_oct": 76.924, "hf_polar_transition_penalty": 1.923, "max_biquads_per_driver_limit": 15, "max_crossover_biquads_per_driver": 8, "max_possible_biquads_per_driver": 14, "total_flat_eq_slots": 34, "total_flat_eq_candidates": 15, "flat_eq_candidate_shortfall_total": 0, "flat_eq_slots_by_driver": { "L26RO4Y": 11, "L22MG (nude)": 9, "GRS PT6816": 7, "ND25FW4 (nude 18mm)": 7 }, "flat_eq_candidate_shortfall_by_driver": { "L26RO4Y": 0, "L22MG (nude)": 0, "GRS PT6816": 0, "ND25FW4 (nude 18mm)": 0 }, "crossover_biquads_within_limit": true, "ipsi_angle": 43.6, "contra_angle": 45.8, "ipsi_angle_deg": 43.6, "contra_angle_deg": 45.8, "xc_ideal_separation_db": 0.33, "xc_separation_median_2_10k_db": 0.399, "xc_separation_p10_2_10k_db": 0.327, "front_ipsi_median_2_10k_db": -4.361, "sep_30_60_median_2_10k_db": 0.399, "sep_30_60_p10_2_10k_db": 0.327, "front30_median_2_10k_db": -4.361, "balanced_rank": 0, "finalist_role": "Baseline fixed seed", "note": "Requested baseline: L26RO4Y below 200 Hz, L22MG 200-800 Hz, GRS 800-2500 Hz, ND25FW above 2500 Hz." } ], "top_candidates": [ { "score": 9.791, "drivers": [ "L26RO4Y", "L22MG (nude)", "SS10F8414G10", "GRS PT6816", "ND25FW4 (nude 18mm)" ], "xovers": [ 120.0, 650.0, 2000.0, 8000.0 ], "xover_orders": [ 4, 4, 4, 2 ], "xover_types": [ "LR4", "LR4", "LR4", "LR2" ], "ways": 5, "dipole_front_rms_db": 1.598, "dipole_rear_rms_db": 1.51, "null_penalty_db": 0.0, "rear0_rms_db": 0.897, "xover_mismatch_rms_db": 7.239, "validity_penalty": 0.0, "prior_penalty": 2.02, "biquad_budget_penalty": 0.0, "known_effective_thd_2_7_percent": 0.0265, "known_thd_coverage_2_7": 0.142, "thd_penalty": 0.052, "hf_polar_ridge_db": 0.0, "hf_polar_slope_excess_db_per_oct": 39.815, "hf_polar_transition_penalty": 0.995, "max_biquads_per_driver_limit": 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"xover_orders": [ 4, 4, 4, 2 ], "xover_types": [ "LR4", "LR4", "LR4", "LR2" ], "ways": 5, "dipole_front_rms_db": 1.623, "dipole_rear_rms_db": 1.52, "null_penalty_db": 0.0, "rear0_rms_db": 0.908, "xover_mismatch_rms_db": 7.452, "validity_penalty": 0.0, "prior_penalty": 2.02, "biquad_budget_penalty": 0.0, "known_effective_thd_2_7_percent": 0.0264, "known_thd_coverage_2_7": 0.141, "thd_penalty": 0.052, "hf_polar_ridge_db": 0.0, "hf_polar_slope_excess_db_per_oct": 39.811, "hf_polar_transition_penalty": 0.995, "max_biquads_per_driver_limit": 15, "max_crossover_biquads_per_driver": 9, "max_possible_biquads_per_driver": 15, "total_flat_eq_slots": 39, "total_flat_eq_candidates": 28, "flat_eq_candidate_shortfall_total": 4, "flat_eq_slots_by_driver": { "L26RO4Y": 11, "L22MG (nude)": 9, "SS10F8414G10": 7, "GRS PT6816": 6, "ND25FW4 (nude 18mm)": 6 }, "flat_eq_candidate_shortfall_by_driver": { "L26RO4Y": 0, "L22MG (nude)": 0, "SS10F8414G10": 0, "GRS PT6816": 4, "ND25FW4 (nude 18mm)": 0 }, "crossover_biquads_within_limit": true, "ipsi_angle": 43.6, "contra_angle": 45.8, "ipsi_angle_deg": 43.6, "contra_angle_deg": 45.8, "xc_ideal_separation_db": 0.33, "xc_separation_median_2_10k_db": 0.42, "xc_separation_p10_2_10k_db": 0.341, "front_ipsi_median_2_10k_db": -4.297, "sep_30_60_median_2_10k_db": 0.42, "sep_30_60_p10_2_10k_db": 0.341, "front30_median_2_10k_db": -4.297 }, { "score": 9.9398, "drivers": [ "L26RO4Y", "L22MG (nude)", "SS10F8414G10", "GRS PT6816", "ND25FW4 (nude 18mm)" ], "xovers": [ 160.0, 650.0, 2000.0, 8000.0 ], "xover_orders": [ 4, 4, 4, 2 ], "xover_types": [ "LR4", "LR4", "LR4", "LR2" ], "ways": 5, "dipole_front_rms_db": 1.601, "dipole_rear_rms_db": 1.636, "null_penalty_db": 0.105, "rear0_rms_db": 1.099, "xover_mismatch_rms_db": 6.996, "validity_penalty": 0.0, "prior_penalty": 2.02, "biquad_budget_penalty": 0.0, "known_effective_thd_2_7_percent": 0.0265, "known_thd_coverage_2_7": 0.142, "thd_penalty": 0.052, "hf_polar_ridge_db": 0.0, "hf_polar_slope_excess_db_per_oct": 39.815, "hf_polar_transition_penalty": 0.995, "max_biquads_per_driver_limit": 15, "max_crossover_biquads_per_driver": 9, "max_possible_biquads_per_driver": 15, "total_flat_eq_slots": 39, "total_flat_eq_candidates": 28, "flat_eq_candidate_shortfall_total": 4, "flat_eq_slots_by_driver": { "L26RO4Y": 11, "L22MG (nude)": 9, "SS10F8414G10": 7, "GRS PT6816": 6, "ND25FW4 (nude 18mm)": 6 }, "flat_eq_candidate_shortfall_by_driver": { "L26RO4Y": 0, "L22MG (nude)": 0, "SS10F8414G10": 0, "GRS PT6816": 4, "ND25FW4 (nude 18mm)": 0 }, "crossover_biquads_within_limit": true, "ipsi_angle": 43.6, "contra_angle": 45.8, "ipsi_angle_deg": 43.6, "contra_angle_deg": 45.8, "xc_ideal_separation_db": 0.33, "xc_separation_median_2_10k_db": 0.419, "xc_separation_p10_2_10k_db": 0.341, "front_ipsi_median_2_10k_db": -4.299, "sep_30_60_median_2_10k_db": 0.419, "sep_30_60_p10_2_10k_db": 0.341, "front30_median_2_10k_db": -4.299 }, { "score": 9.9552, "drivers": [ "L26RO4Y", "L22MG (nude)", "GRS PT6816", "ND25FW4 (nude 18mm)" ], "xovers": [ 120.0, 650.0, 7000.0 ], "xover_orders": [ 4, 4, 2 ], "xover_types": [ "LR4", "LR4", "LR2" ], "ways": 4, "dipole_front_rms_db": 1.48, "dipole_rear_rms_db": 1.299, "null_penalty_db": 0.0, "rear0_rms_db": 0.862, "xover_mismatch_rms_db": 8.518, "validity_penalty": 0.0, "prior_penalty": 1.79, "biquad_budget_penalty": 0.0, "known_effective_thd_2_7_percent": 0.0, "known_thd_coverage_2_7": 0.0, "thd_penalty": 0.087, "hf_polar_ridge_db": 0.0, "hf_polar_slope_excess_db_per_oct": 43.909, "hf_polar_transition_penalty": 1.098, "max_biquads_per_driver_limit": 15, "max_crossover_biquads_per_driver": 7, "max_possible_biquads_per_driver": 14, "total_flat_eq_slots": 36, "total_flat_eq_candidates": 20, "flat_eq_candidate_shortfall_total": 0, "flat_eq_slots_by_driver": { "L26RO4Y": 11, "L22MG (nude)": 9, "GRS PT6816": 8, "ND25FW4 (nude 18mm)": 8 }, "flat_eq_candidate_shortfall_by_driver": { "L26RO4Y": 0, "L22MG (nude)": 0, "GRS PT6816": 0, "ND25FW4 (nude 18mm)": 0 }, "crossover_biquads_within_limit": true, "ipsi_angle": 43.6, "contra_angle": 45.8, "ipsi_angle_deg": 43.6, "contra_angle_deg": 45.8, "xc_ideal_separation_db": 0.33, "xc_separation_median_2_10k_db": 0.403, "xc_separation_p10_2_10k_db": 0.343, "front_ipsi_median_2_10k_db": -4.158, "sep_30_60_median_2_10k_db": 0.403, "sep_30_60_p10_2_10k_db": 0.343, "front30_median_2_10k_db": -4.158 }, { "score": 9.9746, "drivers": [ "L26RO4Y", "L22MG (nude)", "SS10F8414G10", "GRS PT6816", "ND25FW4 (nude 18mm)" ], "xovers": [ 120.0, 650.0, 2000.0, 8000.0 ], "xover_orders": [ 4, 4, 2, 2 ], "xover_types": [ "LR4", "LR4", "LR2", "LR2" ], "ways": 5, "dipole_front_rms_db": 1.733, "dipole_rear_rms_db": 1.722, "null_penalty_db": 0.0, "rear0_rms_db": 0.98, "xover_mismatch_rms_db": 7.239, "validity_penalty": 0.0, "prior_penalty": 2.02, "biquad_budget_penalty": 0.0, "known_effective_thd_2_7_percent": 0.0497, "known_thd_coverage_2_7": 0.249, "thd_penalty": 0.025, "hf_polar_ridge_db": 0.0, "hf_polar_slope_excess_db_per_oct": 33.621, "hf_polar_transition_penalty": 0.841, "max_biquads_per_driver_limit": 15, "max_crossover_biquads_per_driver": 8, "max_possible_biquads_per_driver": 15, "total_flat_eq_slots": 42, "total_flat_eq_candidates": 28, "flat_eq_candidate_shortfall_total": 3, "flat_eq_slots_by_driver": { "L26RO4Y": 11, "L22MG (nude)": 9, "SS10F8414G10": 8, "GRS PT6816": 7, "ND25FW4 (nude 18mm)": 7 }, "flat_eq_candidate_shortfall_by_driver": { "L26RO4Y": 0, "L22MG (nude)": 0, "SS10F8414G10": 0, "GRS PT6816": 3, "ND25FW4 (nude 18mm)": 0 }, "crossover_biquads_within_limit": true, "ipsi_angle": 43.6, "contra_angle": 45.8, "ipsi_angle_deg": 43.6, "contra_angle_deg": 45.8, "xc_ideal_separation_db": 0.33, "xc_separation_median_2_10k_db": 0.427, "xc_separation_p10_2_10k_db": 0.362, "front_ipsi_median_2_10k_db": -4.492, "sep_30_60_median_2_10k_db": 0.427, "sep_30_60_p10_2_10k_db": 0.362, "front30_median_2_10k_db": -4.492 }, { "score": 9.9843, "drivers": [ "L26RO4Y", "L22MG (nude)", "GRS PT6816", "ND25FW4 (nude 18mm)" ], "xovers": [ 120.0, 650.0, 10000.0 ], "xover_orders": [ 4, 4, 2 ], "xover_types": [ "LR4", "LR4", "LR2" ], "ways": 4, "dipole_front_rms_db": 1.406, "dipole_rear_rms_db": 1.289, "null_penalty_db": 0.0, "rear0_rms_db": 0.866, "xover_mismatch_rms_db": 9.051, "validity_penalty": 0.0, "prior_penalty": 1.79, "biquad_budget_penalty": 0.0, "known_effective_thd_2_7_percent": 0.0, "known_thd_coverage_2_7": 0.0, "thd_penalty": 0.087, "hf_polar_ridge_db": 0.076, "hf_polar_slope_excess_db_per_oct": 34.882, "hf_polar_transition_penalty": 0.986, "max_biquads_per_driver_limit": 15, "max_crossover_biquads_per_driver": 7, "max_possible_biquads_per_driver": 15, "total_flat_eq_slots": 36, "total_flat_eq_candidates": 24, "flat_eq_candidate_shortfall_total": 3, "flat_eq_slots_by_driver": { "L26RO4Y": 11, "L22MG (nude)": 9, "GRS PT6816": 8, "ND25FW4 (nude 18mm)": 8 }, "flat_eq_candidate_shortfall_by_driver": { "L26RO4Y": 0, "L22MG (nude)": 0, "GRS PT6816": 3, "ND25FW4 (nude 18mm)": 0 }, "crossover_biquads_within_limit": true, "ipsi_angle": 43.6, "contra_angle": 45.8, "ipsi_angle_deg": 43.6, "contra_angle_deg": 45.8, "xc_ideal_separation_db": 0.33, "xc_separation_median_2_10k_db": 0.412, "xc_separation_p10_2_10k_db": 0.337, "front_ipsi_median_2_10k_db": -4.095, "sep_30_60_median_2_10k_db": 0.412, "sep_30_60_p10_2_10k_db": 0.337, "front30_median_2_10k_db": -4.095 }, { "score": 10.01, "drivers": [ "L26RO4Y", "L22MG (nude)", "SS10F8414G10", "GRS PT6816", "ND25FW4 (nude 18mm)" ], "xovers": [ 120.0, 650.0, 2000.0, 7000.0 ], "xover_orders": [ 4, 4, 4, 2 ], "xover_types": [ "LR4", "LR4", "LR4", "LR2" ], "ways": 5, "dipole_front_rms_db": 1.629, "dipole_rear_rms_db": 1.522, "null_penalty_db": 0.0, "rear0_rms_db": 0.899, "xover_mismatch_rms_db": 7.403, "validity_penalty": 0.0, "prior_penalty": 2.02, "biquad_budget_penalty": 0.0, "known_effective_thd_2_7_percent": 0.0265, "known_thd_coverage_2_7": 0.142, "thd_penalty": 0.052, "hf_polar_ridge_db": 0.0, 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"flat_eq_candidate_shortfall_by_driver": { "L26RO4Y": 0, "L22MG (nude)": 0, "SS10F8414G10": 0, "GRS PT6816": 5, "ND25FW4 (nude 18mm)": 0 }, "crossover_biquads_within_limit": true, "ipsi_angle": 43.6, "contra_angle": 45.8, "ipsi_angle_deg": 43.6, "contra_angle_deg": 45.8, "xc_ideal_separation_db": 0.33, "xc_separation_median_2_10k_db": 0.424, "xc_separation_p10_2_10k_db": 0.339, "front_ipsi_median_2_10k_db": -4.268, "sep_30_60_median_2_10k_db": 0.424, "sep_30_60_p10_2_10k_db": 0.339, "front30_median_2_10k_db": -4.268 } ], "score_terms": { "psychoacoustic_weighting": "broad log-frequency weighting centered near 2.6 kHz, limited to the evaluated band and strongly de-emphasizing the top-octave region above 10 kHz", "dipole_front_rms_db": "psychoacoustic-weighted front normalized polar fit to cosine dipole for 15-75 degrees", "dipole_rear_rms_db": "psychoacoustic-weighted rear normalized polar fit to cosine dipole for 15-75 degrees", "null_penalty_db": "psychoacoustic-weighted penalty for weak 90 degree nulls", "rear0_rms_db": "psychoacoustic-weighted rear 0 degree magnitude symmetry relative to front 0 degree", "xover_mismatch_rms_db": "adjacent-driver normalized polar mismatch around each LR2/LR4 crossover", "hf_polar_transition_penalty": "8-12 kHz penalty for narrow normalized-contour ridges and steep frequency-axis changes at side/rear angles", "xc_separation_median_2_10k_db": "psychoacoustic-weighted median front SPL43.6 - SPL45.8 from 2-10 kHz", "known_effective_thd_2_7_percent": "passband-weighted system THD proxy from available REW THD traces only", "prior_penalty": "small local evidence penalty for distortion/SPL uncertainty or known caveats", "biquad_budget_penalty": "hard rejection only when cascaded crossover filters exceed the 15-biquad/channel cap" } }, "driver_directivity_audit": [ { "driver": "L22MG (nude)", "band": "650-2000 Hz", "front_dipole_rms_db": 4.411, "rear_dipole_rms_db": 2.101, "xc_separation_median_db": 0.517, "xc_separation_p10_db": 0.341, 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"fundamental_spl_p90_db": 84.247, "thd_median_db": -54.16, "thd_p90_db": -49.771, "thd_median_percent": 0.1959, "thd_p90_percent": 0.3247, "frequency_points": 174 }, { "driver": "SS10F8414G10", "sample": "single", "band": "2-10 kHz", "source_file": "measurements/juan/ScanSpeak 10F8414G10/SS10F8414G10 0 F.mdat", "measurement": "SS10F8414G10 0 F", "has_distortion_data": true, "fundamental_spl_median_db": 83.411, "fundamental_spl_p10_db": 82.414, "fundamental_spl_p90_db": 84.236, "thd_median_db": -54.161, "thd_p90_db": -48.646, "thd_median_percent": 0.1959, "thd_p90_percent": 0.3696, "frequency_points": 223 }, { "driver": "SS10F8414G10", "sample": "single", "band": "7-10 kHz", "source_file": "measurements/juan/ScanSpeak 10F8414G10/SS10F8414G10 0 F.mdat", "measurement": "SS10F8414G10 0 F", "has_distortion_data": true, "fundamental_spl_median_db": 82.591, "fundamental_spl_p10_db": 81.165, "fundamental_spl_p90_db": 84.051, "thd_median_db": -54.452, "thd_p90_db": -45.705, "thd_median_percent": 0.1894, "thd_p90_percent": 0.5186, "frequency_points": 49 }, { "driver": "SS10F8424G00", "sample": "sn074", "band": "1-7 kHz", "source_file": "measurements/juan/ScanSpeak 10F8424G00/FRONT/SS10F8424G00 0 F sn 074.mdat", "measurement": "SS10F8424G00 0 F", "has_distortion_data": true, "fundamental_spl_median_db": 83.576, "fundamental_spl_p10_db": 75.933, "fundamental_spl_p90_db": 86.299, "thd_median_db": -55.388, "thd_p90_db": -53.899, "thd_median_percent": 0.17, "thd_p90_percent": 0.2019, "frequency_points": 270 }, { "driver": "SS10F8424G00", "sample": "sn074", "band": "2-7 kHz", "source_file": "measurements/juan/ScanSpeak 10F8424G00/FRONT/SS10F8424G00 0 F sn 074.mdat", "measurement": "SS10F8424G00 0 F", "has_distortion_data": true, "fundamental_spl_median_db": 84.445, "fundamental_spl_p10_db": 83.019, "fundamental_spl_p90_db": 86.331, "thd_median_db": -54.738, "thd_p90_db": -52.48, "thd_median_percent": 0.1833, "thd_p90_percent": 0.2377, "frequency_points": 174 }, { "driver": "SS10F8424G00", "sample": "sn074", "band": "2-10 kHz", "source_file": "measurements/juan/ScanSpeak 10F8424G00/FRONT/SS10F8424G00 0 F sn 074.mdat", "measurement": "SS10F8424G00 0 F", "has_distortion_data": true, "fundamental_spl_median_db": 84.165, "fundamental_spl_p10_db": 82.931, "fundamental_spl_p90_db": 86.235, "thd_median_db": -54.814, "thd_p90_db": -51.995, "thd_median_percent": 0.1817, "thd_p90_percent": 0.2513, "frequency_points": 223 }, { "driver": "SS10F8424G00", "sample": "sn074", "band": "7-10 kHz", "source_file": "measurements/juan/ScanSpeak 10F8424G00/FRONT/SS10F8424G00 0 F sn 074.mdat", "measurement": "SS10F8424G00 0 F", "has_distortion_data": true, "fundamental_spl_median_db": 83.663, "fundamental_spl_p10_db": 82.795, "fundamental_spl_p90_db": 84.388, "thd_median_db": -56.03, "thd_p90_db": -49.932, "thd_median_percent": 0.1579, "thd_p90_percent": 0.3187, "frequency_points": 49 }, { "driver": "SS10F8424G00", "sample": "SN086", "band": "1-7 kHz", "source_file": "measurements/juan/ScanSpeak 10F8424G00/PAIR MATCHING SPL/SS10F8424G00 0 F SN 086.mdat", "measurement": "SS10F8424G00 0 F", "has_distortion_data": true, "fundamental_spl_median_db": 83.956, "fundamental_spl_p10_db": 76.249, "fundamental_spl_p90_db": 86.657, "thd_median_db": -55.639, "thd_p90_db": -53.703, "thd_median_percent": 0.1652, "thd_p90_percent": 0.2065, "frequency_points": 270 }, { "driver": "SS10F8424G00", "sample": "SN086", "band": "2-7 kHz", "source_file": "measurements/juan/ScanSpeak 10F8424G00/PAIR MATCHING SPL/SS10F8424G00 0 F SN 086.mdat", "measurement": "SS10F8424G00 0 F", "has_distortion_data": true, "fundamental_spl_median_db": 84.722, "fundamental_spl_p10_db": 83.33, "fundamental_spl_p90_db": 86.668, "thd_median_db": -55.061, "thd_p90_db": -51.873, "thd_median_percent": 0.1766, "thd_p90_percent": 0.2549, "frequency_points": 174 }, { "driver": "SS10F8424G00", "sample": "SN086", "band": "2-10 kHz", "source_file": "measurements/juan/ScanSpeak 10F8424G00/PAIR MATCHING SPL/SS10F8424G00 0 F SN 086.mdat", "measurement": "SS10F8424G00 0 F", "has_distortion_data": true, "fundamental_spl_median_db": 84.519, "fundamental_spl_p10_db": 83.353, "fundamental_spl_p90_db": 86.517, "thd_median_db": -55.117, "thd_p90_db": -51.194, "thd_median_percent": 0.1755, "thd_p90_percent": 0.2756, "frequency_points": 223 }, { "driver": "SS10F8424G00", "sample": "SN086", "band": "7-10 kHz", "source_file": "measurements/juan/ScanSpeak 10F8424G00/PAIR MATCHING SPL/SS10F8424G00 0 F SN 086.mdat", "measurement": "SS10F8424G00 0 F", "has_distortion_data": true, "fundamental_spl_median_db": 84.102, "fundamental_spl_p10_db": 83.394, "fundamental_spl_p90_db": 84.64, "thd_median_db": -56.17, "thd_p90_db": -48.91, "thd_median_percent": 0.1554, "thd_p90_percent": 0.3586, "frequency_points": 49 }, { "driver": "MU10RB-SL", "sample": "A", "band": "1-7 kHz", "source_file": "measurements/juan/SEAS MU10RB SL POLARES/FRONT/SEAS MU10RBSL A 0 F.mdat", "measurement": "SEAS MU10RBSLA 0 F", "has_distortion_data": true, "fundamental_spl_median_db": 81.866, "fundamental_spl_p10_db": 75.075, "fundamental_spl_p90_db": 84.013, "thd_median_db": -45.425, "thd_p90_db": -43.333, "thd_median_percent": 0.5355, "thd_p90_percent": 0.6813, "frequency_points": 270 }, { "driver": "MU10RB-SL", "sample": "A", "band": "2-7 kHz", "source_file": "measurements/juan/SEAS MU10RB SL POLARES/FRONT/SEAS MU10RBSL A 0 F.mdat", "measurement": "SEAS MU10RBSLA 0 F", "has_distortion_data": true, "fundamental_spl_median_db": 82.9, "fundamental_spl_p10_db": 80.673, "fundamental_spl_p90_db": 84.612, "thd_median_db": -44.715, "thd_p90_db": -42.877, "thd_median_percent": 0.5811, "thd_p90_percent": 0.7181, "frequency_points": 174 }, { "driver": "MU10RB-SL", "sample": "A", "band": "2-10 kHz", "source_file": "measurements/juan/SEAS MU10RB SL POLARES/FRONT/SEAS MU10RBSL A 0 F.mdat", "measurement": "SEAS MU10RBSLA 0 F", "has_distortion_data": true, "fundamental_spl_median_db": 82.336, "fundamental_spl_p10_db": 78.59, "fundamental_spl_p90_db": 84.331, "thd_median_db": -44.592, "thd_p90_db": -42.638, "thd_median_percent": 0.5894, "thd_p90_percent": 0.7381, "frequency_points": 223 }, { "driver": "MU10RB-SL", "sample": "A", "band": "7-10 kHz", "source_file": "measurements/juan/SEAS MU10RB SL POLARES/FRONT/SEAS MU10RBSL A 0 F.mdat", "measurement": "SEAS MU10RBSLA 0 F", "has_distortion_data": true, "fundamental_spl_median_db": 78.666, "fundamental_spl_p10_db": 77.504, "fundamental_spl_p90_db": 81.306, "thd_median_db": -43.87, "thd_p90_db": -42.496, "thd_median_percent": 0.6405, "thd_p90_percent": 0.7502, "frequency_points": 49 } ], "effective_system_thd": [ { "band": "1-7 kHz", "effective_known_thd_percent_weighted": NaN, "effective_known_thd_p90_percent": NaN, "known_fundamental_coverage_weighted": 0.0, "front0_spl_weighted_median_db": 76.077, "known_trace_drivers": "", "missing_trace_drivers": "L26RO4Y, L22MG (nude), GRS PT6816, ND25FW4 (nude 18mm)", "method": "front 0-degree driver contributions weighted by measured REW THD traces and combined incoherently" }, { "band": "2-7 kHz", "effective_known_thd_percent_weighted": NaN, "effective_known_thd_p90_percent": NaN, "known_fundamental_coverage_weighted": 0.0, "front0_spl_weighted_median_db": 75.946, "known_trace_drivers": "", "missing_trace_drivers": "L26RO4Y, L22MG (nude), GRS PT6816, ND25FW4 (nude 18mm)", "method": "front 0-degree driver contributions weighted by measured REW THD traces and combined incoherently" }, { "band": "2-10 kHz", "effective_known_thd_percent_weighted": NaN, "effective_known_thd_p90_percent": NaN, "known_fundamental_coverage_weighted": 0.0, "front0_spl_weighted_median_db": 75.959, "known_trace_drivers": "", "missing_trace_drivers": "L26RO4Y, L22MG (nude), GRS PT6816, ND25FW4 (nude 18mm)", "method": "front 0-degree driver contributions weighted by measured REW THD traces and combined incoherently" }, { "band": "7-10 kHz", "effective_known_thd_percent_weighted": NaN, "effective_known_thd_p90_percent": NaN, "known_fundamental_coverage_weighted": 0.0, "front0_spl_weighted_median_db": 75.986, "known_trace_drivers": "", "missing_trace_drivers": "L26RO4Y, L22MG (nude), GRS PT6816, ND25FW4 (nude 18mm)", "method": "front 0-degree driver contributions weighted by measured REW THD traces and combined incoherently" } ], "distortion_level_notes": [ "Raw REW .mdat THD was extracted from each driver's front 0-degree measurement; harmData[0] is treated as REW's THD trace and harmData[1] as the fundamental SPL trace.", "In the 2-7 kHz THD band, L10NEO's median fundamental SPL is 86.6 dB (+3.0 dB vs SS10F8414G10 single, +1.9 dB vs SS10F8424G00 SN086, +3.7 dB vs MU10RB-SL A), so it was not measured at a lower level than the ScanSpeak references.", "L10NEO 2-7 kHz median THD is 0.157% (-56.1 dB), which is not worse than the available 8414/8424 raw REW THD traces.", "These are not perfectly level-matched sweeps; distortion rankings should be treated as measured-at-level evidence, not normalized maximum-SPL evidence." ], "l10_scanspeak_rationale": [ "Raw REW evidence does not favor ScanSpeak on THD: L10NEO is 0.157% median THD at 86.6 dB SPL in 2-7 kHz, while the best available ScanSpeak trace is SS10F8424G00 SN086 at 0.177% and 84.7 dB SPL.", "The baseline is a fixed seed, not an optimizer-selected rejection of L10NEO; use it only as the requested reference stack.", "Conclusion: L10NEO must not be rejected on distortion/SPL evidence; any non-L10 selection has to be justified by directivity/crossover integration, not by the available raw THD traces." ], "filter_topology": { "architecture": "cascaded mixed-order Linkwitz-Riley split tree with shared high-pass carryover (LR4 / LR4 / LR4)", "diagram": "Input\n +-- LR4 HP 70 Hz (2 biquads, global boundary)\n +-- LR4 split @ 200 Hz\n +-- LR4 LP 200 Hz (2 biquads) -> L26RO4Y\n +-- LR4 HP 200 Hz (2 biquads) -> next split\n +-- LR4 split @ 800 Hz\n +-- LR4 LP 800 Hz (2 biquads) -> L22MG (nude)\n +-- LR4 HP 800 Hz (2 biquads) -> next split\n +-- LR4 split @ 2500 Hz\n +-- LR4 LP 2500 Hz (2 biquads) -> GRS PT6816\n +-- LR4 HP 2500 Hz (2 biquads) -> ND25FW4 (nude 18mm)", "stages": [ { "stage": 1, "driver": "L26RO4Y", "passband_hz": [ 70.0, 200.0 ], "global_boundary_hp_biquads": 2, "inherited_upstream_hp_biquads": 0, "own_branch_hp_biquads": 0, "own_branch_lp_biquads": 2, "effective_crossover_biquads": 4, "effective_lr4_biquads": 4, "flat_eq_biquads": 2, "effective_total_biquads": 6, "polarity": 1 }, { "stage": 2, "driver": "L22MG (nude)", "passband_hz": [ 200.0, 800.0 ], "global_boundary_hp_biquads": 2, "inherited_upstream_hp_biquads": 0, "own_branch_hp_biquads": 2, "own_branch_lp_biquads": 2, "effective_crossover_biquads": 6, "effective_lr4_biquads": 6, "flat_eq_biquads": 3, "effective_total_biquads": 9, "polarity": 1 }, { "stage": 3, "driver": "GRS PT6816", "passband_hz": [ 800.0, 2500.0 ], "global_boundary_hp_biquads": 2, "inherited_upstream_hp_biquads": 2, "own_branch_hp_biquads": 2, "own_branch_lp_biquads": 2, "effective_crossover_biquads": 8, "effective_lr4_biquads": 8, "flat_eq_biquads": 1, "effective_total_biquads": 9, "polarity": 1 }, { "stage": 4, "driver": "ND25FW4 (nude 18mm)", "passband_hz": [ 2500.0, 20000.0 ], "global_boundary_hp_biquads": 2, "inherited_upstream_hp_biquads": 4, "own_branch_hp_biquads": 2, "own_branch_lp_biquads": 0, "effective_crossover_biquads": 8, "effective_lr4_biquads": 8, "flat_eq_biquads": 6, "effective_total_biquads": 14, "polarity": 1 } ], "summary": { "xover_types": [ "LR4", "LR4", "LR4" ], "xover_orders": [ 4, 4, 4 ], "shared_tree_crossover_biquads": 14, "standalone_channel_crossover_biquads": 26, "shared_tree_lr4_biquads": 14, "standalone_channel_lr4_biquads": 26, "flat_eq_biquads": 12, "shared_tree_total_biquads_with_eq": 26, "standalone_channel_total_biquads": 38, "max_biquads_per_driver_limit": 15, "max_effective_total_biquads_per_driver": 14, "per_driver_limit_met": true }, "notes": [ "Shared-tree count assumes the DSP can route a high-pass bus into the next split stage.", "Standalone-channel count is what is exported per driver when each output channel must contain all inherited upstream filters.", "LR2 splits use one Q=0.5 biquad per edge and invert the next/downstream branch; LR4 splits use two Q=0.7071 biquads per edge without a required polarity inversion.", "Flat-EQ is capped after crossover filters so every exported driver channel stays at or below 15 total biquads.", "Gain, delay, and polarity are not counted as biquads." ] }, "flatness_optimization": { "target_db": 76.0, "fit_domain_hz": [ 160.0, 18000.0 ], "primary_constraint": { "smoothing": "one_third_octave", "band": "200-10k", "max_peak_to_peak_db": 0.7, "max_rms_error_db": 0.25 }, "constraint_met": false, "optimizer_cost": 4.676, "optimizer_nfev": 9, "filters_tested": 15, "max_biquads_per_driver": 15, "flat_eq_capacity_by_driver": { "L26RO4Y": 11, "L22MG (nude)": 9, "GRS PT6816": 7, "ND25FW4 (nude 18mm)": 7 }, "flat_eq_used_by_driver": { "L26RO4Y": 2, "L22MG (nude)": 3, "GRS PT6816": 1, "ND25FW4 (nude 18mm)": 6 }, "final_biquads_by_driver": { "L26RO4Y": 6, "L22MG (nude)": 9, "GRS PT6816": 9, "ND25FW4 (nude 18mm)": 14 }, "max_flat_eq_filters_allowed": 15, "filters_kept": 12, "front_sum_flat_eq_filters_kept": 12, "high_frequency_polar_eq": { "before": { "hf_polar_ridge_db": 0.0, "hf_polar_slope_excess_db_per_oct": 76.5735, "hf_polar_transition_penalty": 1.9143 }, "after": { "hf_polar_ridge_db": 0.0, "hf_polar_slope_excess_db_per_oct": 76.5735, "hf_polar_transition_penalty": 1.9143 }, "accepted_filters": [], "method": "grid-search optional +/- PEQ cuts/boosts around 7.5-12.5 kHz, accepted only if the front-sum flatness degradation stays within a small tolerance" }, "full_fit_filters_needed": 14, "method": "sparse least-squares: solve full candidate pool, rank by fitted correction magnitude, then try the smallest ranked sets against the smoothed summed-response constraint; if no capped set satisfies it, keep the best-scored set while capping every exported driver channel at 15 total biquads; then try optional +/- high-frequency PEQs for 8-12 kHz polar smoothness only if they do not materially degrade front-sum flatness", "before": { "raw": { "80-18k": { "median_db": 76.225, "min_error_db": -6.06, "max_error_db": 2.432, "peak_to_peak_db": 8.491, "rms_error_db": 1.638 }, "200-10k": { "median_db": 76.256, "min_error_db": -3.27, "max_error_db": 2.4, "peak_to_peak_db": 5.67, "rms_error_db": 1.298 }, "2-10k": { "median_db": 75.626, "min_error_db": -2.64, "max_error_db": 2.507, "peak_to_peak_db": 5.147, "rms_error_db": 1.098 } }, "one_sixth_octave": { "80-18k": { "median_db": 76.197, "min_error_db": -5.571, "max_error_db": 2.439, "peak_to_peak_db": 8.01, "rms_error_db": 1.615 }, "200-10k": { "median_db": 76.251, "min_error_db": -2.52, "max_error_db": 2.385, "peak_to_peak_db": 4.905, "rms_error_db": 1.281 }, "2-10k": { "median_db": 75.568, "min_error_db": -1.837, "max_error_db": 2.527, "peak_to_peak_db": 4.364, "rms_error_db": 1.058 } }, "one_third_octave": { "80-18k": { "median_db": 76.197, "min_error_db": -5.755, "max_error_db": 2.382, "peak_to_peak_db": 8.137, "rms_error_db": 1.591 }, "200-10k": { "median_db": 76.243, "min_error_db": -2.194, "max_error_db": 2.336, "peak_to_peak_db": 4.53, "rms_error_db": 1.254 }, "2-10k": { "median_db": 75.595, "min_error_db": -1.546, "max_error_db": 2.386, "peak_to_peak_db": 3.932, "rms_error_db": 1.007 } } }, "after": { "raw": { "80-18k": { "median_db": 75.968, "min_error_db": -7.582, "max_error_db": 1.469, "peak_to_peak_db": 9.051, "rms_error_db": 1.39 }, "200-10k": { "median_db": 76.016, "min_error_db": -1.789, "max_error_db": 0.898, "peak_to_peak_db": 2.687, "rms_error_db": 0.342 }, "2-10k": { "median_db": 75.972, "min_error_db": -1.745, "max_error_db": 0.942, "peak_to_peak_db": 2.687, "rms_error_db": 0.474 } }, "one_sixth_octave": { "80-18k": { "median_db": 75.968, "min_error_db": -7.582, "max_error_db": 1.154, "peak_to_peak_db": 8.736, "rms_error_db": 1.377 }, "200-10k": { "median_db": 76.014, "min_error_db": -1.066, "max_error_db": 0.714, "peak_to_peak_db": 1.78, "rms_error_db": 0.29 }, "2-10k": { "median_db": 75.968, "min_error_db": -1.019, "max_error_db": 0.761, "peak_to_peak_db": 1.78, "rms_error_db": 0.388 } }, "one_third_octave": { "80-18k": { "median_db": 75.979, "min_error_db": -7.594, "max_error_db": 1.03, "peak_to_peak_db": 8.624, "rms_error_db": 1.367 }, "200-10k": { "median_db": 76.019, "min_error_db": -0.421, "max_error_db": 0.355, "peak_to_peak_db": 0.776, "rms_error_db": 0.192 }, "2-10k": { "median_db": 75.988, "min_error_db": -0.323, "max_error_db": 0.387, "peak_to_peak_db": 0.71, "rms_error_db": 0.232 } } } }, "upper_mid_side_feature": { "search_band_hz": [ 1600.0, 3200.0 ], "min_f90_minus_f0_db": -47.066, "min_frequency_hz": 2694.6, "max_f90_minus_f0_db": -24.717, "max_frequency_hz": 3193.3, "interpretation": "The dark feature at 90 degrees is a side null, not an off-axis SPL peak. It is dominated by the upper-mid crossover/driver transition and should not be filled with on-axis EQ unless the design goal changes." }, "local_evidence_notes": [ "Juan's screenshot notes rank 8424 distortion/SPL best, 8414 close behind, and MU10 worst among the 8424/8414/MU10 upper-mid comparison.", "Raw REW .mdat THD extraction adds L10NEO to the comparison and does not support describing L10NEO as worse-distortion than the ScanSpeak pair.", "The same notes flag 8424 rear-side directivity and high-angle order as weaker than 8414, especially above 2 kHz.", "GRS is treated as the measured dipole/directivity-order reference, but it does not provide the largest configured x-c angle separation above 2 kHz.", "L10NEO remains a high-separation alternate; it is not selected in the balanced primary due to the composite directivity/crossover score, not because of worse raw THD evidence.", "Driver contribution peaks are not automatically flattened when they are helping the complex 0-degree sum; the search now separately penalizes narrow 8-12 kHz normalized-contour ridges and steep side/rear polar transitions." ], "mounting_geometry_notes": [ "The synthetic HDF5 is a horizontal 0-180 degree sum of separately suspended driver measurements; it does not model vertical-plane lobing from center-to-center spacing.", "Non-GRS cone/dome drivers are assumed approximately axisymmetric when reasoning about vertical behavior, but the GRS planar is not axisymmetric and needs measured or modeled vertical data.", "A first-order vertical lobing model is feasible if driver coordinates and acoustic-center offsets are supplied, but it would only cover source interference, not pseudo-baffle diffraction.", "The pseudo-baffle/diffraction from a vertical mounting spine, neighboring motor structures, wiring, and driver frames is not identifiable from the current individual-driver HDF5 data; it needs CAD/BEM or assembly measurements.", "Recommendation: use this synthetic model for driver/filter shortlisting, then measure the actual stacked fixture horizontally and vertically before treating the crossover as final." ], "validation_warnings": [ "L26RO4Y source is a 25 cm deep / 32 cm diameter cylindrical-baffle measurement, not a nude baffleless capture.", "Processed phase was reconstructed from separately loaded measurements after per-measurement impulse peak alignment; synthetic complex summation is therefore preliminary.", "Rear polarity convention is inherited from the measurement files and existing 0-180 mapping; it has not been independently validated with raw impulse polarity.", "Absolute SPL and maximum-SPL claims remain limited by the available local evidence; raw THD is extracted for available 0-degree REW files but not normalized to matched drive level.", "DI and beamwidth figures match the existing repo convention and use front-horizontal data only, not a full 3D power response.", "Vertical-plane beaming and pseudo-baffle diffraction from the final stacked mounting geometry are not modeled.", "The 10 kHz/top-octave behavior is treated as suspect validation territory; search and comparison weights emphasize 2-10 kHz and do not let a narrow top-octave feature decide the design." ], "generated_files": { "synthetic_hdf5": "output/data/polar_data_juan_cdsl_baseline_synthetic.h5", "html_report": "docs/juan-baffleless-cdsl-baseline.html", "asset_root": "docs/juan-baffleless-cdsl-baseline", "driver_directivity_audit_csv": "output/juan-baffleless-cdsl-baseline/driver_directivity_audit.csv", "distortion_thd_audit_csv": "output/juan-baffleless-cdsl-baseline/distortion_thd_audit.csv", "effective_system_thd_csv": "output/juan-baffleless-cdsl-baseline/effective_system_thd.csv" }, "drivers": [ { "role": "Low", "driver": "L26RO4Y", "passband_hz": [ 70.0, 200.0 ], "source": "measurements/juan/L26RO4Y POLARES EN BAFFLE CILINDRICO VER NOTA", "gain_db": -13.295, "delay_ms": 0.0, "polarity": 1, "rationale": "Best measured low-frequency candidate, but captured in a cylindrical baffle.", "filters": [ { "type": "highpass", "fc_hz": 70.0, "q": 0.7071, "gain_db": 0.0, "source": "LR4 global boundary high-pass" }, { "type": "highpass", "fc_hz": 70.0, "q": 0.7071, "gain_db": 0.0, "source": "LR4 global boundary high-pass" }, { "type": "lowpass", "fc_hz": 200.0, "q": 0.7071, "gain_db": 0.0, "source": "LR4 branch low-pass" }, { "type": "lowpass", "fc_hz": 200.0, "q": 0.7071, "gain_db": 0.0, "source": "LR4 branch low-pass" }, { "type": "peaking", "fc_hz": 110.0, "q": 1.0, "gain_db": -1.2, "source": "flat-EQ" }, { "type": "lowshelf", "fc_hz": 95.0, "q": 1.0, "gain_db": -0.534, "source": "flat-EQ" } ] }, { "role": "Lower mid", "driver": "L22MG (nude)", "passband_hz": [ 200.0, 800.0 ], "source": "measurements/juan/SEAS L22MG NUDE MIC ON AXIS", "gain_db": 12.533, "delay_ms": -0.48, "polarity": 1, "rationale": "Strong low-mid bridge with nude front/rear data and useful coverage below 500 Hz.", "filters": [ { "type": "highpass", "fc_hz": 70.0, "q": 0.7071, "gain_db": 0.0, "source": "LR4 global boundary high-pass" }, { "type": "highpass", "fc_hz": 70.0, "q": 0.7071, "gain_db": 0.0, "source": "LR4 global boundary high-pass" }, { "type": "highpass", "fc_hz": 200.0, "q": 0.7071, "gain_db": 0.0, "source": "LR4 branch high-pass" }, { "type": "highpass", "fc_hz": 200.0, "q": 0.7071, "gain_db": 0.0, "source": "LR4 branch high-pass" }, { "type": "lowpass", "fc_hz": 800.0, "q": 0.7071, "gain_db": 0.0, "source": "LR4 branch low-pass" }, { "type": "lowpass", "fc_hz": 800.0, "q": 0.7071, "gain_db": 0.0, "source": "LR4 branch low-pass" }, { "type": "peaking", "fc_hz": 500.0, "q": 1.0, "gain_db": -4.535, "source": "flat-EQ" }, { "type": "peaking", "fc_hz": 330.0, "q": 1.0, "gain_db": 3.239, "source": "flat-EQ" }, { "type": "peaking", "fc_hz": 620.0, "q": 1.0, "gain_db": -0.497, "source": "flat-EQ" } ] }, { "role": "Upper/directivity band", "driver": "GRS PT6816", "passband_hz": [ 800.0, 2500.0 ], "source": "measurements/juan/GRS PT6816 A MIC ON AXIS", "gain_db": 4.024, "delay_ms": 0.025, "polarity": 1, "rationale": "Best local constant-directivity and front/rear symmetry reference.", "filters": [ { "type": "highpass", "fc_hz": 70.0, "q": 0.7071, "gain_db": 0.0, "source": "LR4 global boundary high-pass" }, { "type": "highpass", "fc_hz": 70.0, "q": 0.7071, "gain_db": 0.0, "source": "LR4 global boundary high-pass" }, { "type": "highpass", "fc_hz": 200.0, "q": 0.7071, "gain_db": 0.0, "source": "LR4 cascaded upstream high-pass" }, { "type": "highpass", "fc_hz": 200.0, "q": 0.7071, "gain_db": 0.0, "source": "LR4 cascaded upstream high-pass" }, { "type": "highpass", "fc_hz": 800.0, "q": 0.7071, "gain_db": 0.0, "source": "LR4 branch high-pass" }, { "type": "highpass", "fc_hz": 800.0, "q": 0.7071, "gain_db": 0.0, "source": "LR4 branch high-pass" }, { "type": "lowpass", "fc_hz": 2500.0, "q": 0.7071, "gain_db": 0.0, "source": "LR4 branch low-pass" }, { "type": "lowpass", "fc_hz": 2500.0, "q": 0.7071, "gain_db": 0.0, "source": "LR4 branch low-pass" }, { "type": "peaking", "fc_hz": 2800.0, "q": 1.0, "gain_db": -0.373, "source": "flat-EQ" } ] }, { "role": "Top", "driver": "ND25FW4 (nude 18mm)", "passband_hz": [ 2500.0, 20000.0 ], "source": "measurements/juan/DAYTON ND25FW4 ANIDADOS 18 MM NUDE", "gain_db": 1.16, "delay_ms": -0.125, "polarity": 1, "rationale": "Treble extension candidate; measured 2-10 kHz pattern is wider than the 10 cm candidates.", "filters": [ { "type": "highpass", "fc_hz": 70.0, "q": 0.7071, "gain_db": 0.0, "source": "LR4 global boundary high-pass" }, { "type": "highpass", "fc_hz": 70.0, "q": 0.7071, "gain_db": 0.0, "source": "LR4 global boundary high-pass" }, { "type": "highpass", "fc_hz": 200.0, "q": 0.7071, "gain_db": 0.0, "source": "LR4 cascaded upstream high-pass" }, { "type": "highpass", "fc_hz": 200.0, "q": 0.7071, "gain_db": 0.0, "source": "LR4 cascaded upstream high-pass" }, { "type": "highpass", "fc_hz": 800.0, "q": 0.7071, "gain_db": 0.0, "source": "LR4 cascaded upstream high-pass" }, { "type": "highpass", "fc_hz": 800.0, "q": 0.7071, "gain_db": 0.0, "source": "LR4 cascaded upstream high-pass" }, { "type": "highpass", "fc_hz": 2500.0, "q": 0.7071, "gain_db": 0.0, "source": "LR4 branch high-pass" }, { "type": "highpass", "fc_hz": 2500.0, "q": 0.7071, "gain_db": 0.0, "source": "LR4 branch high-pass" }, { "type": "highshelf", "fc_hz": 18000.0, "q": 1.0, "gain_db": 8.0, "source": "flat-EQ" }, { "type": "peaking", "fc_hz": 10000.0, "q": 2.0, "gain_db": 6.31, "source": "flat-EQ" }, { "type": "peaking", "fc_hz": 12000.0, "q": 1.0, "gain_db": -4.59, "source": "flat-EQ" }, { "type": "peaking", "fc_hz": 16500.0, "q": 1.0, "gain_db": 3.83, "source": "flat-EQ" }, { "type": "peaking", "fc_hz": 9000.0, "q": 2.0, "gain_db": -3.108, "source": "flat-EQ" }, { "type": "peaking", "fc_hz": 14000.0, "q": 1.0, "gain_db": -1.31, "source": "flat-EQ" } ] } ], "baseline_comparison": [ { "metric": "Weighted 2-10 kHz SPL43.6 - SPL45.8 (dB)", "weight_percent": 22, "direction": "higher", "chosen": 0.43628741601328397, "baseline": 0.40431990072665236, "baseline_minus_chosen": -0.03196751528663161, "winner": "chosen", "note": "Ipsi/contra angular separation is the main CDSL target; weighting emphasizes the ear-sensitive 2-7 kHz center and downweights the suspect top octave." }, { "metric": "Crossover-local polar mismatch RMS (dB)", "weight_percent": 17, "direction": "lower", "chosen": 7.239, "baseline": 9.038, "baseline_minus_chosen": 1.7990000000000004, "winner": "chosen", "note": "Keeps adjacent driver radiation patterns close through each acoustic handoff, which is why the chosen mixed LR2/LR4 stack is not judged by SPL alone." }, { "metric": "8-12 kHz polar transition/ridge penalty", "weight_percent": 16, "direction": "lower", "chosen": 2.3039204849943355, "baseline": 1.9143373120568807, "baseline_minus_chosen": -0.3895831729374548, "winner": "baseline", "note": "Penalizes narrow contour ridges and steep frequency-axis changes at side/rear angles, so a bright 10 kHz side-energy stripe is not accepted as benign." }, { "metric": "Weighted 90-degree leakage excess RMS (dB)", "weight_percent": 13, "direction": "lower", "chosen": 0.025009254265610115, "baseline": 0.0, "baseline_minus_chosen": -0.025009254265610115, "winner": "baseline", "note": "Penalizes energy above a -18 dB side-null target where crosstalk cancellation is most sensitive." }, { "metric": "Weighted front dipole polar error RMS (dB)", "weight_percent": 10, "direction": "lower", "chosen": 2.1138301368031147, "baseline": 2.055277595683166, "baseline_minus_chosen": -0.058552541119948565, "winner": "baseline", "note": "Keeps the front lobe close to a cosine/dipole shape rather than just maximizing one angle pair." }, { "metric": "Weighted rear dipole polar error RMS (dB)", "weight_percent": 7, "direction": "lower", "chosen": 2.3511867009629275, "baseline": 1.3514230336855213, "baseline_minus_chosen": -0.9997636672774062, "winner": "baseline", "note": "Checks whether the rear radiation stays dipole-like instead of becoming an uncontrolled back lobe." }, { "metric": "Weighted rear/front symmetry RMS (dB)", "weight_percent": 5, "direction": "lower", "chosen": 2.105757082970072, "baseline": 1.0673326994304677, "baseline_minus_chosen": -1.038424383539604, "winner": "baseline", "note": "Dipole behavior needs rear 0-degree magnitude close to front 0-degree after filtering." }, { "metric": "Weighted 200-10k flatness RMS (dB)", "weight_percent": 6, "direction": "lower", "chosen": 0.18218952773483213, "baseline": 0.21146733484085659, "baseline_minus_chosen": 0.029277807106024456, "winner": "chosen", "note": "Uses one-third-octave front-sum trend with the same broad psychoacoustic weighting; filter count is only a cap, not a score." }, { "metric": "Effective known system THD, 2-7 kHz (%)", "weight_percent": 4, "direction": "lower", "chosen": 0.0572, "baseline": NaN, "baseline_minus_chosen": NaN, "winner": "insufficient coverage", "note": "Uses filtered driver contributions and available REW THD traces; incomplete coverage is reported separately." }, { "metric": "Known THD contribution coverage, 2-7 kHz", "weight_percent": 0, "direction": "higher", "chosen": 0.2091, "baseline": 0.0, "baseline_minus_chosen": -0.2091, "winner": "context", "note": "Coverage is not a winner metric; it tells how much of the weighted fundamental has measured THD traces." } ], "baseline_constraints": [ { "variant": "Chosen", "xover_types": "LR4 / LR4 / LR4 / LR2", "max_biquads": 15, "limit": 15, "biquad_cap_met": true, "flatness_rms_db": 0.166, "flatness_peak_to_peak_db": 0.818, "flatness_met": false }, { "variant": "Baseline", "xover_types": "LR4 / LR4 / LR4", "max_biquads": 14, "limit": 15, "biquad_cap_met": true, "flatness_rms_db": 0.192, "flatness_peak_to_peak_db": 0.776, "flatness_met": false } ] }