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Analog Line Level Preamplifiers , Passive Pre-amps, Crossovers, etc.

Variable LPF & Gain for ICEPower amp input
Variable LPF & Gain for ICEPower amp input
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Old 19th October 2019, 01:03 AM   #1
Brinkman is online now Brinkman  United States
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Join Date: Aug 2007
Location: Oakland, CA
Variable LPF & Gain for ICEPower amp input
Default Variable LPF & Gain for ICEPower amp input

So Iím 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 Iíve 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 Iíd much rather have an ICEpower unit to repurpose later if I go to a DSP based setup.
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Old 19th October 2019, 10:45 PM   #2
Brinkman is online now Brinkman  United States
diyAudio Member
 
Join Date: Aug 2007
Location: Oakland, CA
Variable LPF & Gain for ICEPower amp input
So it looks like I may be able to combine two of Rod Elliotís 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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File Type: gif 044C95FC-E74A-488B-8C3F-4FE68F5501E9.gif (3.6 KB, 26 views)
File Type: gif A2EFE7B2-B3F0-4C48-86D4-89D2FFB3BCB1.gif (7.2 KB, 26 views)
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