Hello, I have a PT cruiser and I am looking at the Q12s or Q15s (4 of each) I have the back seats removed and have about 17.875 cuft to work with, the box would be: WIDTH is 39 in. HEIGHT is 24 in. DEPTH is 33 in. Would there be enough room in that box for (4) Q15s sealed? Maybe able to add 2 more inches to the Depth! I will running about 1500 watts rms to each subwoofer, will the Q12s or 15s without the power opt. handle that much power in a sealed box? thanks.....Brian

You have more than enough room for (4) 15s in that box.

If you have a true 1500 RMS per sub, I would add the BP power. If you are good at controlling the volume and keeping the power clean, you should be ok without it. Just remember, no warranty for burnt coils

Brian