Speaker Insulation?

[Imtjnotu 5,000+ posts]

yes thats it...and what sub are u putting in it...u wont need any polyfil for it at all

 

[NoExperience 10+ year member]

kk good to know, it is a audioque 12" (NEW) Street Duty SDC2.0-12-D4 Subwoofer if you wanna check it out with AUDIOPIPE MINI AMP MONO 300W MOSFET POWER CAR AMPLIFIER | eBay

wanted just an upgrade to my stock system, not a system to rock the five cars next to me lol

 

[whitedragon551 5,000+ posts]

Polyfill in a ported box is not a bad thing. It flattens out the frequency response. A ported box generally has two peaks. One at the cars frequency and one near the box tuning. Polyfill will help it from being less peaky in those situations.