After Later Audio SUM+INV

Marsoni

M251S

$89.00

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

After Later Audio SUM+INVTwo identical channels with two inputs and two outputs. For the first output the two inputs are summed (at unity) and the second output the sum (at unity) is inverted. The second channel is identical to the first channel but it normals channel one summed output to the first input. This enables a 3: 1 configuration with both a summed and inverted output. This is a great companion to the COCO system. Width: 2hp 12V: 10mA 12V: 10mA Product Specs Item

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Good product, not much to say. The product arrived quickly, looks to be of high quality construction, fit perfectly and took me only a couple of minutes to install. I love it when a product is no frills and delivers as advertised. I've used various filters from K&N before and have always had very good success with them so I will be buying more of these for sure when the time comes.

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Reviewed in the United States on November 9, 2025

Verified Purchase

john A.

Los Angeles, US

★★★★★ 5

Better than most.

Size: (Pack of 1)

Looks good, perfect fit.

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Reviewed in the United States on May 25, 2026