I just installed a 4-channel Rockford Fosgate Prime R250X4 class A/B amp in my Trailblazer to power my Polk Audio DB6501 and DB652 speakers. I did have them running off my Pioneer head unit but the tweeters were way to harsh and the woofers were barely putting anything out, so I figured it needed more juice since they were rated for 100w. The 652's in the back sounded nice, but they were components and didn't need as much juice. They still did not have the punch I have heard them produce in other vehicles. I wanted to get the 400X4 class D amp, but I got a deal on this one and it will work till I get the funds. They are the same size anyway and will be a plug-in-play setup later. I can't complain about this one though: sounds nice and gets plenty loud.
I didn't want to install it under the front seats because I was worried about it getting water on it from the kids spilling something in the back seat. Up under the passenger rear seat there is a box for the Onstar under a plastic clamshell. Since the 2002's use the old analog system for the network it was useless without the upgrade so I removed the box and found a nice flat surface to mount the amp. I just had to place a piece of plywood over the bracket to make it larger. A mini amp would mount perfectly to it, like one of the Boosted Rail amps.
I routed the cables under the carpet without even removing it. I just had to remove the jack tool carrier (3 nuts) and the drivers side passenger seat bottom (4 nuts) to cut out slots to pull the cable through to the center console. This way when everything was reinstalled the slits int the carpet were hidden under the hardware. The power cable was ran along the drivers side door sill to the rear fuse box and then across to the tool mount using the same method.
Sounds amazing and looks almost stock.
I didn't want to install it under the front seats because I was worried about it getting water on it from the kids spilling something in the back seat. Up under the passenger rear seat there is a box for the Onstar under a plastic clamshell. Since the 2002's use the old analog system for the network it was useless without the upgrade so I removed the box and found a nice flat surface to mount the amp. I just had to place a piece of plywood over the bracket to make it larger. A mini amp would mount perfectly to it, like one of the Boosted Rail amps.
I routed the cables under the carpet without even removing it. I just had to remove the jack tool carrier (3 nuts) and the drivers side passenger seat bottom (4 nuts) to cut out slots to pull the cable through to the center console. This way when everything was reinstalled the slits int the carpet were hidden under the hardware. The power cable was ran along the drivers side door sill to the rear fuse box and then across to the tool mount using the same method.
Sounds amazing and looks almost stock.
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That's a better use for that real estate, anyway. 
