Some of you have seen the threads and posts I have made on the subject of low-cut filters. While exploring my options there, I picked up this Harrison Labs PFMOD passive filter--it's pretty cool, and it does the job, but now it's time for somebody else to experiment with it.
FWIW the "perfect" solution I eventually found was a custom active module by [sfx].
Again this is a passive device, no batteries or other power needed. It is meant to be used at line level, but it also works at instrument level. It is
not to be put between your amp and your speaker cab. It was originally designed as two
separate -12 dB filters, with RCA in/outputs. I hardwired the two filters in series, and connected 1/4" unbalanced in/out instrument jacks. The remaining RCA jacks are nonfunctional, I just left them in because I didn't need to remove them. I realize it looks bogus having the jacks hanging out in the breeze like that, but I didn't feel like drilling a new housing for it. That would be an easy project though.
The filters each can be set for 20, 25, 30, or 35 Hz; since they are hardwired in series, you can get some interesting and useful slopes by setting each filter differently--or set them the same for a steeper drop with the one corner frequency. The settings are chosen by moving the position of the two jumper tabs in the middle. As a passive device, it will reduce the level of your signal a little bit, but it won't distort easily even with high input levels.
Brand new it cost me $40 plus $10 postage. I'm selling it here for $25 shipped. Come 'n' get it!
