SeM20 Filter Single Channel

Marsoni

M251S

$165.00

Get it in 3 business days with 1 day shipping. Friday, May 29

SeM20 Filter Single ChannelThe SeM20 is a 2 pole state variable filter loosely based on the Oberheim SEM's filter with the resonance section of the MS20 grafted on for extra bit of grit. It won't self oscillate, usually, but with an input, or the High Pass out plugged into the Input, it will howl. The Input section is set up much like the input of the OSCar, when the input is at 5 it's full volume. Beyond 5 the filter will begin to overdrive and distort.

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I use this on many builds to dampen the metal echo in cars, vans, and trucks. Just one sheet in the center of a body panel is a huge difference maker. You can also cover the entire surface and get added insulation value. The noise is greatly depleted and it's easy to install with a roller tool. Looks Great when done. Good Product I will use again!

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Reviewed in the United States on December 29, 2025

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chris cook

Los Angeles, US

★★★★★ 5

Great, affordable upgrade

Style: 36 Sqft 80 mil

Easy to use and install. Great upgrade

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Reviewed in the United States on May 8, 2026

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Sbushlnzl

Whiting, US

★★★★★ 5

Nice sound deadening, self adhesive mats

Style: 18 Sqft 80 mil

These mats should work fine for my application. I’m applying it to the back sides of the hollow core doors on the closet where my HVAC is installed to reduce the “hum” from passing through. If I were sound deadening my automobile, I would probably use a heavier gage material. Overall, good product at a reasonable price.

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Reviewed in the United States on March 21, 2026

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vivian johnson

Alexandria, US

★★★★★ 5

Very good product

Style: 36 Sqft 80 mil

Easy to install, very sticky. Will buy again.

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Reviewed in the United States on May 20, 2026