I'm looking to get a nice build going for my '02 GMC Envoy. I just replace the junk factory radio today with a Pioneer AVH-P8400BH and also decided to pick up a ND-BC5 back up camera. Now its time to get the sub-stage rolling.

Currently my truck runs on a stock 150amp alt which will need a upgrade. So I am limited to a single h/o alt for this build due to no room under the hood. I'm leaning towards a dc 270amp alt. With this alt and a power cell or 2 will I have trouble keeping up the demand of a Crecendo BC3500 with possibly 500-1k watts to spare for my front stage?

I want to pick up a pair of SSA XCONS for this amp but I'm having trouble on deciding to go with 2-12's or 2-15's. I know the more cone area the better. The fact is I don't want the box to take up my hole trunk. Current dimensions I'm dealing with is 18h x 45w x 22d. Thats keeping it below the window but covers the whole cargo area (rear seats to rear hatch, wheel well to wheel well). Approx 10.5ft3. I want subs to fire up, port back. I was thinking more of a 7.5ft3 net box tuned around 32hz for 2-15 XCONS, that sound about right? I listen to allot of Dubstep, Hip hop, and on occasion rock. Also will the Crescendo BC3500 be a good match for these 2-15's?

Is the Envoy still NA? As long as that alt does what it is supposed to you'll be fine....although I am having a hard time understanding how/why you are going to have 1kW on your front stage.

7.5 cuft out to fill the hole in your trunk area nicely. It will also be fine for a pair of Xcon 15's. In that size box you'll get more out of the 15's than the 12's although upping the size a bit wouldn't hurt either. The C'do will be fine powering the subs. "upgrading" further won't really yield you an audible difference in the box you describe.

Please explain what you mean by NA? For the front stage I am just giving a rough estimate, I haven't looked that far yet for the build. As far as upping the size for the 15's go, are you talking about maybe to 8ft3 as stated in ssa's box specs as "optimal ported", or even larger than that?

He means Naturally Aspirated.

Yes its naturally aspirated. Sorry thought it was some sort of electronic lingo.