4 15's in a fiberglass box

[autosportsunltd 10+ year member]

ok i just hooked up all 4 of my PB 2Xl's on a us xt4000d. They are in a sealed fiberglass box that i built. I only had 2 of them hooked up at first and the 2 hit harder and sounded better than all 4. could it be the box or the amp?

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[morgans432 10+ year member]

check how you have them wired from the amp to the subs

 

[chinxtaboi 10+ year member]

check your wire config, pretty sure thats the xfactor.

 

[ultimate157 5,000+ posts]

probably wired them out of phase.

 

[dbhittin 5,000+ posts]

well that amp is only like 1000rms

 

[ultimate157 5,000+ posts]

well that amp is only like 1000rms

Rated for 1500w into 1.

You're increasing the power from 450 to 1500, so power per sub is increasing by ~125w.

Should be a hell of a lot louder.