Ok guys, I am taking it upon myself to design a generic two-way subwoofer crossover. My basic idea is to make PCB's available at cost to folks here. Now, it's my design, so I retain total authority over what's involved, but I'm soliciting suggestions anyway.
Basic idea: symmetrical, 4th order LR type. Stereo full range L/R inputs, highpass L/R outputs, mono subwoofer output. Additional 2nd order highpass rumble filter on the subwoofer that can be defeated. Also, MAYBE an incorporated Linkwitz Transform circuit, useable with or without the rumble filter to kill out unecessary <20Hz gain of the LT ckt (also defeatable). Phase delay compensation on sub out.
Places where I need help? Making this thing easily adjustable in terms of crossover frequency. I don't want folks to have to pop open the box and swap out resistors or caps to change out the xo freq. I want discrete, fraction-of-an-octave spaced selectable xo frequencies. I don't know how to do this - any suggestions are very much welcome! I don't know if I could do it with resistor arrays and relays to set resistor values in the sallen-key filters or what. I don't know what type of relays are good (low noise) for audio.
So, Discuss! Let me know what recommendations you might have. I could probably do these at Advanced Ckts for the 3 for $33 deal they have, or I could do it with their Bare Bones PCB service (though I really hate not having a solder mask and ref designators on a board).
Also, I would probably make it buildable into one of these:
I've used them at work and they are nice. They also have plastic front and back plate options for those not wanting to drill aluminum end plates.
Basic idea: symmetrical, 4th order LR type. Stereo full range L/R inputs, highpass L/R outputs, mono subwoofer output. Additional 2nd order highpass rumble filter on the subwoofer that can be defeated. Also, MAYBE an incorporated Linkwitz Transform circuit, useable with or without the rumble filter to kill out unecessary <20Hz gain of the LT ckt (also defeatable). Phase delay compensation on sub out.
Places where I need help? Making this thing easily adjustable in terms of crossover frequency. I don't want folks to have to pop open the box and swap out resistors or caps to change out the xo freq. I want discrete, fraction-of-an-octave spaced selectable xo frequencies. I don't know how to do this - any suggestions are very much welcome! I don't know if I could do it with resistor arrays and relays to set resistor values in the sallen-key filters or what. I don't know what type of relays are good (low noise) for audio.
So, Discuss! Let me know what recommendations you might have. I could probably do these at Advanced Ckts for the 3 for $33 deal they have, or I could do it with their Bare Bones PCB service (though I really hate not having a solder mask and ref designators on a board).
Also, I would probably make it buildable into one of these:
I've used them at work and they are nice. They also have plastic front and back plate options for those not wanting to drill aluminum end plates.
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