Headphones
Save routing and a fixed reference at a low, repeatable volume. Repeat it after a cable, device or software change.
Run Headphones — Day-1 acceptanceLocal baselines
Compare to when it was new.
Keep a known-good electrical-loopback reference in your browser, then assess changes only when the method and measurement floor support it.
Acceptance protocols
Establish a reference once.
Headset
Record output routing and repeat a microphone check using the same connection mode, distance and phrase.
Run Headset — Day-1 acceptanceAudio interface
Only with a safe electrical return path: run loopback, read eligibility, then save the local baseline.
Run Audio interface — Day-1 acceptanceInterpretation rules
History does not change the math.
Method matches first
If a signal method or the reported input settings change, the comparison warns you rather than passing off unlike runs as a regression.
Below the floor is not a finding
A small delta is shown as within the measurement floor. WaveLocus does not call it significant.
Retention is separate
A future paid history layer may retain more baselines or run batches. It cannot change a measured delta, floor or confidence decision.