I have two Aiyima 07 amp's driving my tower speakers and a subwoofer. The signal goes from my DAC into the first amp that drives the tower speakers. I use the AUX output to go to a electronic cross over which drives the second Aiyima 07 amp for my subwoofer.
I would like a high pass filter of 40 Hz in the first amp to unload the tower speakers and continue using the AUX to drive the second amp.
Is this possible or is there a other way? any input is welcome 🙂🙂
I would like a high pass filter of 40 Hz in the first amp to unload the tower speakers and continue using the AUX to drive the second amp.
Is this possible or is there a other way? any input is welcome 🙂🙂
Yes, just add it before the amplifier. Use f = 1 / ( 2Pi x R x C )
Series C and shunt R, which could be the amp's input impedance.
More info about the amp and source?
Series C and shunt R, which could be the amp's input impedance.
More info about the amp and source?
You want an active or passive filter? How sharp do you want the cutoff to be?
I would go with a fourth order active Butterworth or Bessel filter. They’re easy to build on a perf board and have very modest power requirements. Two opamp chips and an handful of resistors and capacitors. NE5533 will do fine, but you can use higher end opamps if you feel like it.
I would go with a fourth order active Butterworth or Bessel filter. They’re easy to build on a perf board and have very modest power requirements. Two opamp chips and an handful of resistors and capacitors. NE5533 will do fine, but you can use higher end opamps if you feel like it.
I have a Aiyima 07 class D amp and source is a DAC dongle connected to a notebook. I need a unfiltered signal to feed my subwoofer. The signal now passes the first amp and then goes by AUX to the second amp for the sub.
@njswede I prefer a simple passive filter, possibly (?) in the amp, 6 dB or 12 dB is fine. The thing is that the input signal passes the first amp and goes by AUX to the second who needs all low frequencies for the sub. I don't know if this could be done.. i know the Douk audio A has adjustable high pass witch is basically what i want.
Is the crossover filter really a crossover filter or only a low-pass filter? In other words, has it got high-pass outputs as well?
I’m not sure I understand what you mean, but I’ll give it a shot: If you don’t want the tower speaker to see the low frequencies, you have two alternatives:
1. Do all the filtering after the first amp. The high pass has to be a high power passive filter after the speaker output.
2. Split the line level input signal and do the filtering on the branch that goes to the first amplifier and bypass the unfiltered signal to the sub.
It sounds like you want to “unfilter” the signal that comes out of the AUX on the first amplifier. You can’t do that. (*)
(*) In theory you could do that with a low pass filter with gain, but you’d end up amplifying a lot of noise and the overall frequency curve would all over the place.
Good shot, thanks. 2: "Split the line level input signal and do the filtering on the branch that goes to the first amplifier and bypass the unfiltered signal to the sub" is probably he best way to go for me. Does splitting the signal affect the output of these two signals?
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It's a electronic crossover, a Boss bx55 they use for car's but works well with a 12 dB slope 40 Hz. The AUX signal from the first amp feeds it.
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It shouldn’t. If you’re going want to be really fancy you can add buffers.
Can't you just send the signal from the DAC to the crossover, the crossover's high-pass outputs (front outputs) to the first amplifier that drives the tower speakers and the crossover's low-pass output (subwoofer output) to the second amplifier that drives the subwoofer?
@MarcelvdG, thanks for your question. Yes i could do that with this Boss BX55 electronic crossover but the signal will pass the pre-amp / filter in the Boss BX55 crossover and will add distortion to the signal. It's a simple, but not bad, car electronic crossover. For the subwoofer it does not matter so much because it works there under 40 Hz / 12 dB. but i will give it a try again to test the sound.
Splitting the signal and feeding the hi-pass / amp and the sub crossover separately would maintain the signal quality.
Splitting the signal and feeding the hi-pass / amp and the sub crossover separately would maintain the signal quality.
I tried it like you suggested, it works really good about high / low pass filtering (12 dB) with the tower speakers and the sub. After listening and reversing to the original setup the sound from the tower speakers is much better and refined. The boss crossover is no match for the DAC, JCally JM20 and A07 amp. ;-)