Interpret dBFS, SNR, latency and distortion only within the route and processing settings shown in Evidence.
IP-AUD-01 / PCM LEVEL / DEVICE PATH
Speaker Frequency Sweep Test
Play a logarithmic 20 Hz to 20 kHz reference and listen for gaps, rattles or imbalance.
A speaker or headphone driver sounds uneven or rattles at some frequencies.
This focused entry uses the shared Audio protocol. The measurement logic and Evidence version remain identical to the complete lab.
Remove the easiest false alarms first.
01
Close calls and recording apps, select the intended route and keep system gain fixed.
02
Use a moderate safe volume and avoid changing microphone distance during a protocol.
03
Treat acoustic and confirmed fixed-gain loopback sessions as different measurement paths.
Run one repeatable protocol.
- 01
Start at a moderate safe volume.
- 02
Run the full eight-second logarithmic sweep.
- 03
Note audible gaps or rattles, then repeat on the other channel.
Evidence the result should expose.
DIRECT / INFERREDSweep frequency
DIRECT / INFERREDCompletion
DIRECT / INFERREDHuman observation
Separate observed, review and inconclusive.
Repeat with fixed gain, then compare wired, Bluetooth and direct loopback paths one variable at a time.
Acoustic measurements include speaker, room, microphone, OS and browser; they are not device specifications or hearing diagnoses.
Start with the likely path, then retest.
01
Driver resonance
02
Seal or fit
03
Room mode
04
Hearing range