Variable LPF & Gain for ICEPower amp input

Brinkman

Member
Paid Member
2007-08-17 5:48 pm
Oakland, CA
So I’m looking for a stable, quiet input circuit I can use just upstream of an ICEpower amplifier that provides variable F3 for a 2nd order low pass filter (80-250Hz) and some gain for level matching.

The closest thing I’ve come across is this:
Variable Low Pass Filter Electronic Subwoofer Crossover Preamp Board with Gain Control

This combination is intended to power a pair of stand-alone mid-bass modules I would like to run beneath my sealed mains. I have found some plate amplifiers of questionable quality that purport to meet my needs but I’d much rather have an ICEpower unit to repurpose later if I go to a DSP based setup.
 

Brinkman

Member
Paid Member
2007-08-17 5:48 pm
Oakland, CA
So it looks like I may be able to combine two of Rod Elliot’s projects, his Subwoofer Phase Controller (Project 103) and for a continuously variable 2nd order low pass filter requirement, his State Variable Filter (Project 148).

I still need a implement a basic gain control.

The circuits for both projects are attached.
 

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