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In Reply to: RE: Time Alignment posted by jcmusic on August 05, 2014 at 04:53:57
Do you have the ability to apply delay to one or the other? That requires a DSP and individual amping of the drivers.
Follow Ups:
Yes I can add delay through my eq.
Reverse the tweeter polarity, play a test tone at the crossover frequency, vary the delay until the response notch at the crossover frequency reaches maximum value. When done restore the tweeter polarity. You can use the same procedure to align the mid and woofer.
Well written and easy to understand while at the same time conveying the pertinent information. Another great post Bill.
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?
> 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.
nt
all the best,
mrh
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