Sound Quality Diagnosis - Phase Test

Sound Quality Diagnosis - Phase Test

Special Tools Required

- Diagnostics CD 07AAZ-SDBA100
Use the following tests to check sound quality.

NOTE: Before beginning the following tests, write down the client's bass, treble, fader and balance settings, then set them to their center positions for the testing.

Phase Test

Do this test to confirm proper speaker phasing.

1. Insert the audio diagnostic CD (T/N 07AAZ-SDBA100) into the audio unit.

2. Play track No. 2 (phase) at a normal, or slightly higher than normal, volume level.

3. The voice should sound centered and focused when it is in-phase.

4. The voice should sound diffused, and have less bass when it is out of phase.
- If the voice changes from in-phase to out of phase as indicated by the prompt, the phasing is correct. Go to electrical noise test. Sound Quality Diagnosis - Electrical Noise Test

- If the voice always sounds out of phase, phasing is not correct. Check for:
- Crossed speaker wire

- Faulty amplifier

- Faulty audio unit