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In Reply to: RE: Time Alignment posted by Bill Fitzmaurice on August 05, 2014 at 06:57:00
Bill when you say play a test tone at the xover frequency, what exactly do you mean? Also can I just physically move the tweeters back and forth and look at the RTA for the deepest null?
Follow Ups:
> Bill when you say play a test tone at the xover frequency, what exactly do you mean? Also can I just physically move the tweeters back and forth and look at the RTA for the deepest null?
If the crossover is, for instance, 2.5kHz, then you'd play a 2.5kHz sine wave tone. You may move the tweeter back and forth to get the same result.
Hey Bill tried this today using 6khz and moving the tweeters with flipped polarity and RTA, strange I am getting a peak instead of a null???
> Hey Bill tried this today using 6khz and moving the tweeters with flipped polarity and RTA, strange I am getting a peak instead of a null???
That means the tweeter polarity was flipped to begin with. The usual cause of that is 2nd order crossovers. It also means that something else isn't right, as the summed response of the mid and tweeter when they are in phase should be flat, or close to it, not a peak.
Thanks Bill.
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