I could never get mad at you
drewfx1 I don't get mad at anyone!
I find it easier to just make stereo test signals and pan centre and just measure either the left or right output.
(Analog outputs that is) Usually they are identical as they should be.
Tell you what can be interesting though is to do some polarity tests. Adobe Audition
(ala Cool Edit Pro) can create a special test signal that is not the same above and below the line.
(A sinewave is no good because a CRO will trigger on the one part of the cycle so you cannot tell) You need an oscilloscope but it is interesting to check the polarity of signals leaving your interface as well.
On a previous system I had two audio interfaces running under Logic. Although the waveforms appeared the right way up in the DAW one interface was inverting the signal. Not a big deal unless you had a stereo signal going across two interfaces which you would not do but it was interesting none the less.
Also interesting is to feed this polarity test signal out through a known poweramp
which does not invert the signal of course and into a speaker that is moving the right way. Then I put every microphone I owned in front of the speaker, fed that signal into a preamp that was not inverting the signal
(which it should not of course) and look at the output on a scope. I found some of my microphones were inverting the signal! It is also good to test multiple speakers in your room as well just to make sure. You can run the polarity test signal through various bits of outboard gear.
(and pedals too) You will be surprised what you find.
Also if you are running multiple speakers in a large PA system this test is also invaluable for checking the polarity of all your FOH and monitor low and high frequency drivers. You will also be amazed at what you find.
post edited by JeffinOz - 2011/12/30 15:41:00