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In Reply to: RE: Questions about high pass filter and balanced bridge posted by Tube747 on June 13, 2017 at 09:28:57
You do need the input impedance of the amp. However just because you are bridging the amps doesn't mean the impedance is cut in half. There is probably a phase inversion circuit at the amps input that may need to be taken into account.
What amp are you using?
The amplifier is Linar A105. Here is the manual.
With the amps fully balanced inputs, you can expect the impedance to be the 53k between the phases, so your assumption that you need the crossover spec'd for half of that is probably correct. But since they are a little vague on how the impedance is specified I'm not 100% certain.
Refer to their website, FMOD 70Hz high pass filter should be 140hz if the input impedance is smaller or equal to 10k.
So I assume the actual filter for 70Hz high pass should be around 80hz range I guess with the input impedance of amp at 53.3k.
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