| 1. Intelligibility (Spectral Variance) |
70% – 75% |
80% – 85% (Directional mic array) |
95% – 98% (Flat response) |
Negligible (Speech is well above floor rumble) |
| 2. Ambient Noise Floor (dBSPL) |
50% Abs / 90% Rel |
60% Abs / 92% Rel (Uncalibrated) |
98% Abs / 99% Rel (Factory Calibrated) |
HIGH (Floor rumble creates fake low-end noise floor) |
| 3. Signal-to-Noise Ratio (SNR) |
85% – 90% |
88% – 92% (Low preamp noise) |
95% – 98% (High dynamic range) |
Moderate (Raises background floor, reducing SNR) |
| 4. Feedback Stability (Peak Persistence) |
90% – 95% |
92% – 95% (Exact peak detection) |
98% – 99% (Exact spectral peaks) |
Low (Feedback is >250Hz; vibration is <80Hz) |
| 5. Digital Clipping Ratio |
98% – 100% |
100% (Exact sample ceiling) |
100% (Exact A/D ceiling) |
None (Pure digital threshold check) |
| 6. Estimated RT60 (Pause Decay) |
65% – 75% |
70% – 80% (Passive estimation) |
90% – 95% (Precise impulse decay) |
Moderate (Sub-bass rumble extends low-end decay) |
| 7. Speech Modulation (Clarity Proxy) |
60% – 70% |
68% – 75% (Mid-band proxy) |
88% – 92% (Exact early/late energy) |
Low (Early window isolates airborne sound) |
| 8. Magnitude Ripple (Smoothness) |
75% – 80% |
80% – 85% (Uncalibrated mic response) |
95% – 98% (True room mode peaks/nulls) |
HIGH (Adds false low-frequency room mode spikes) |
| 9. True NC Curve Fitting (ISO Rating) |
50% Abs / 85% Rel |
60% Abs / 88% Rel (MEMS roll-off) |
95% Abs / 98% Rel (Full Octave SPL) |
HIGH (Inflates 63Hz / 125Hz NC octave bands) |
| 10. PAG - NAG Gain Margin |
80% – 85% |
85% – 90% (Geometric calculation) |
95% – 98% (Calibrated SPL gain) |
Low (Geometric distance equation dominant) |
| 11. Sub-Bass Coherence Ratio |
85% – 90% |
90% – 95% (High chassis sensitivity) |
92% – 96% (True airborne sub-bass) |
PRIMARY DETECTOR (Specifically flags floor rumble) |