Posted by Wayne Parham [ 70.234.106.162 ] on July 15, 2008 at 15:41:08:
In Reply to: No imagery posted by Tom Daugherty on July 15, 2008 at 00:36:46:
An easy way to check phase is to set balance all the way to one speaker and compare it with the sound with both sides playing. Do this first with the fronts and then with the rears. After that, do front to back.
What you're listening for the the tonal balance, not the overall volume. If both speakers are connected properly, then bass and treble will increase volume equally when both speakers are playing. If one is reversed, then the deepest bass frequencies will not increase when both are playing, in fact, they'll go down a bit. The midbass, midrange and treble will increase but not the real deep bass.
Isolate one speaker at a time. For example, first have the faders set forward, and compare left and right. Once you know that's right, set fader for full rear and do the same process. After you've verified the rears, do the same process front-to-back to verify the front pair and rear pair are phased properly.
This only works for bass frequencies. The reflections inside the car and the number of sound sources make interference very complex above midrange frequencies, so polarity reversals aren't immediately obvious at high frequencies. So this process won't work to verify your tweeters.
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