Polyfill question

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Poly fill traps the rear wave of the speaker keeping it from reflecting back and hitting the cone. This reduces 2nd order and 3rd order distortion...
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https://www.amazon.com/dp/B0CJB5TTPB/?tag=caraudiocom-20
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LOL - mine was a higher end model too - iirc deh-9300. Low mileage too, it was sitting around for year collecting dust.
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One or two, they are still subwoofer outs and are mono summed signals from both left and right. Even the 2 RCA subwoofer pre-outs on the 2nd one...
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Doxquzme

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