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In Reply to: Re: Power amp high pass filter posted by Keith Lockwood on December 26, 2006 at 08:25:37:
Thanks for your clear and concise info, Keith. My input impedance is 100K, so I'm looking at 0.02uF caps. Thanks for the tip on the V-Cap.
Follow Ups:
Try to put the capacitors as close to the power amp input as possible: even inside if you don't mind opening and modifying it.Also be sure to damp the capacitors against acoustic vibration. Cotton batting and Teflon thread-seal tape are handy materials that are also benign dielectrics for audio use.
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I checked out the reviews at VH Audio, and the bottom line is that these appear to be the best caps available unless one wants to to into three figures - the V-Cap TFTF is around $35... seems like money well spent since I've ordered them. I plan on installing them internally, and will use the cotton to isolate them from vibration as advised. Thanks again.
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Keith, what rolloff slope would this cap mod provide?Also, any thoughts on how this method compares to the inline RCA plug type HPF's available from ACI, Harrison Labs (FMODs) etc?
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