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Dirty-South Blues Harp forum: wail on! >
Low Pass Filter with significant volume drop
Low Pass Filter with significant volume drop
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derwood.blues
4 posts
Jan 12, 2026
2:14 PM
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I had created a tone knob in a box for my Pignose Amp to cut the highs and reduce feedback. It worked great until I tried it with my wireless. Then it did nothing. So I had the great idea of putting the capacitor into my microphone before the wireless. I tested it first by putting the tone knob in a box between the mic and the wireless. It worked, so I got some on/off/on dpdt switches and some .01mp and .02mp capacitors and made a 3 option low pass filter,
While I assembled it I tested it with the pignose because it was easy to put on my workbench. It worked great. Feedback in the middle capacitor bypass position and no feedback when either capacitor was engaged. I put it in 3 mics. A CR with an A500 volume pot, a turner ceramic with an A500 volume pot (The 1M pot broke when I was putting it together) and a NOS ceramic element with a 1M volume pot. All three worked great with the pignose.
Though the pignose was the initial use case, I thought this would be a great solution for jams and such when I have no control over the rig I plug into.
Then I took them downstairs and plugged them into my Sonic Pipe Windy City and the CR worked great. But the other two had a huge volume drop when I engaged the capacitors. I went back to the pignose and they both worked great. I tried them with a cable to see if it was the wireless and got the same volume drop. I tried it on another tube amp and got the same issue.
I am a bit baffled. Could it be the interaction of the impedances of the element, volume pot and amplifier? Do I need to change out the volume pot? Why does it work with the pignose but not other amps? Any electrical expertise would be appreciated.
Derwood
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derwood.blues
5 posts
Jan 12, 2026
9:29 PM
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Here is a diagram of the circuit:
ToneCircuit
Last Edited by derwood.blues on Jan 12, 2026 9:34 PM
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nacoran
10468 posts
Jan 16, 2026
2:14 PM
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Above my pay grade!
I wonder if you reached out to someone like Greg Heumann would be able to make some suggestions, or at least point you to someone who could.
He's over on FB, or you could reach out to him at https://blowsmeaway.com/
I know he wrote a whole guide on impedance matching.
There are some FB and reddit groups that specialize in stuff like that.
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