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Tweaks for systems, rooms and Do It Yourself (DIY) help. FAQ.

300hz is too high

Of course this makes sense, and is what I use, along with the acoustic roll off, in my own system as the entire high pass filter to my mid/treble amps and speakers. Be aware that any electrical filter will act in conjunction with existing speaker system response. In other words, if there is already a filter as part of the speaker system, it has a transfer function that will be affected by whatever other filters you add. You don't state what the 400hz filter's slope is, but it will be affected by the 300hz filter at the amp input.

Just as a goal of speaker xovers is to set any filters outside a two octave window of flat response, so should this amp filter be designed accordingly. I wouldn't try anything higher than 100hz. You still will be removing a considerable portion of low frequency energy demand from your amp. For a 100Hz corner freq, you would need a .03uF cap into 50k ohms. Standard cap value is .033uF, which would give 96Hz corner.

And yes, the Jupiter copper foil/wax paper caps are superb for what you're doing. There might be better caps, but I have not heard them.

Tom E
berate is 8 and benign is 9

Edits: 02/03/17

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