Hi all, question/opinions?
I'm working on a pair of WMTMW speakers.
I redesigned the midrange crossover, which has turned out to be huge improvement over the previously existing design. These are pre-built speakers, with all Scanspeak drivers. The original mid xover had a poorly implemented bsc, and a layout that created a 2 ohm minima with a +57 degree phase angle. It wasn't a very easy drive for a couple different amplifiers.
Anyway, it's substantially improved now. The previous crossover used a single Audyn 100uF Q4 for the mid/tweeter highpass. I reused that, and it is currently a very good phase match to the woofers, having a 27 db null with reversed phasing.
My question, pertaining to the 100uF is,
Would you suggest;
A) Leaving it alone?
B) replacing it with a "better" capacitor?
C) adding a bypass with a very good 1 uF?
D) adding a bypass with a very good .01 uF?
E) or other?
Since all mid/tweet signal passes through this cap, I am wondering if some type of upgrade might be beneficial. All upstream caps are higher quality (not that the Q4 is bad). And it does sound very good now.
Thanks in advance - Rick
I'm working on a pair of WMTMW speakers.
I redesigned the midrange crossover, which has turned out to be huge improvement over the previously existing design. These are pre-built speakers, with all Scanspeak drivers. The original mid xover had a poorly implemented bsc, and a layout that created a 2 ohm minima with a +57 degree phase angle. It wasn't a very easy drive for a couple different amplifiers.
Anyway, it's substantially improved now. The previous crossover used a single Audyn 100uF Q4 for the mid/tweeter highpass. I reused that, and it is currently a very good phase match to the woofers, having a 27 db null with reversed phasing.
My question, pertaining to the 100uF is,
Would you suggest;
A) Leaving it alone?
B) replacing it with a "better" capacitor?
C) adding a bypass with a very good 1 uF?
D) adding a bypass with a very good .01 uF?
E) or other?
Since all mid/tweet signal passes through this cap, I am wondering if some type of upgrade might be beneficial. All upstream caps are higher quality (not that the Q4 is bad). And it does sound very good now.
Thanks in advance - Rick
If all the mid / tweet signal goes through this, I'd at least experiment with the 1u bypass - see if you hear anything positive. If so, then leave it or replace with a better 100u.
See? It never ends! ;')
See? It never ends! ;')
Bypasses must make up a significant fraction of the total capacitance to work, something like 30%. I would assume a lower fraction (say 10%) also works, if the cap is sized for midrange frequencies and the bypass only has to work at high frequencies. But 1 or 0.1 µF will not do much within the audio range.
I would leave it alone.
I would leave it alone.
Last edited: