The conference center had three sound engineers across three shifts: morning, afternoon, and evening. Each had system processor access. None of them talked to each other. The results were predictable in the way that car accidents are predictable when three people grab the same steering wheel.

Engineer A (morning) measured a 6 dB room mode at 160 Hz. He applied a -6 dB notch. Correct, professional, well-documented in his notebook. Engineer B (afternoon) arrived, saw the 160 Hz notch, assumed it was an error, and boosted 160 Hz by 4 dB 'to compensate.' He also noticed a brightness issue and cut 8 kHz by 5 dB. Engineer C (evening) heard the muffled highs (from B's cut) and boosted 8 kHz by 6 dB. She also noticed 160 Hz sounded odd (because it was now at -2 dB from the stack of corrections) and applied a broad low-mid shelf boost.

After one week of this rotation, the system processor had forty-seven active EQ filters, some cancelling each other, others stacking constructively. The frequency response looked like an ECG during cardiac arrest. A visiting consultant bypassed all processing and discovered the raw PA was within ±3 dB — the room was fine. Every 'correction' had been correcting the previous person's correction.

The Moral: Document your system EQ. Lock it. Communicate it. SonaVyx's stored traces and before/after comparison create an objective baseline that everyone can reference — because when three engineers tune independently, the system loses every time.