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In Reply to: RE: Oh dear ... let me rephrase posted by Paul Joppa on July 05, 2014 at 21:54:08
Hi Paul
I believe the crossover frequencies is around 2,500Hz and first order slope. I am thinking that for the signal I feed my SET if I keep the cutoff at below 400Hz I should keep all the phase issues I will introduce well away from being audible or bothering the tweeter.
The bass driver and signal I am not touching.
thanks
Cleet
Follow Ups:
That helps a bit. A first order crossover has only 90 degrees of phase difference between the highpass and lowpass signals, and (ignoring temporarily the response of the drive units) the tweeter signal is still substantial two octaves below the crossover (625Hz in this case).
Without writing a book on crossover design, I think you'll get the fastest and most reliable answers by experimenting. Put in the capacitor that Tre' described, but lay in a supply of several values. Use clipleads or a switch so you can compare the sound with the cap in and out, or between caps. Don't listen for sonic quality, just the frequency response/tonality.
It is not uncommon to reverse the tweeter phase, especially in first and third order crossovers, looking for the best sound. Add that to the experiment if you have thee time and patience.
You may well end up with something different from the designer's intent, but that works better in your room with your music etc... But if you do the experiment, you will know what compromises and choices you have made, and will have no need to worry whether it might have been done better.
The post from Tre' to which I referred seems to have changed or disappeared, so my reference has no meaning anymore. I was talking of an RC filter and so was the post that has gone away. Sorry for the confusion.
For what it's worth, higher order filters have more phase shift.
I took a class in filter design in grad school; it barely scratched the surface of what matters in speaker crossovers. That's why I suggest experimenting, and I suggest keeping the experiments simple with few variables at first. Or, of course, asking the designer of the speakers you are considering.
It didn't go anywhere and I didn't edit it.
Tre'
Have Fun and Enjoy the Music
"Still Working the Problem"
That's teh one. It didn't show up yesterday for some reason. Thanks.
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