I've been using HiFonics since back in 1989 and have owned several models. They make some of most durable and clean sounding amps you'll ever hear. They are impossible to blow (trust me... I've tried) with three levels of built-in protection, this is because they are overbuilt and are underrated. While not very well know to the main stream public, they are extremely respected on the competition circuit. The four channel design saved space (and money) in addition to making the installation easier, plus it's very flexible so I can upgrade later. I'm running my front speakers in stereo with 55 watts using the front channels (1 & 2) and the subwoofer is running bridged mono with 220 watts off the rear channels (3 & 4).

The following pictures detail how I got the amp, CD changer and DSP processor into the small area behind the seats of my Quad Cab.

This is the area you have to work in on the back cab wall of the Quad Cab once the rear seats are out, not much room at all. The black lines are where my amp (passenger side near the jack) and my CD-changer (drivers side) are going to go. The line down the middle is just for reference so I can align a wood template later on.

Using the wood templates (a right and left side) you can see the final position of the amp and CD Changer will go. Notice how I had to work around the cab exhaust vents.

This detail shot shows the custom amp brackets and the cut-out that goes around the cab exhaust vents

This is a close-up view of those custom tabs that allowed us to counter sink the amp for maximum depth behind the seats.

There are four tabs total (one in each corner). Here you are looking at the template from behind, the cut out on the right side is for the RCA jacks, while cut-out on the left is for cab exhaust vents.

Here you can see the custom tabs again along with a line showing the plastic I had to remove to get the RCA jacks and amp in.

As you can tell I've covered the cab exhaust vents with carpet (from the stock panel I removed) and placed some carpet where the amp and CD changer will go to keep them from touching the cab wall's metal surface.

Here the edge has been removed and covered with door trim molding for a custom look. You can see some of the wiring that will soon be tucked under the carpet once everything is in and tested.

This is how the edge looks once the template has been carpeted and the amp put into place along with the Monster Cable Interlink RCA interconnect cables & jacks.

Here is how everything looks before I put the seats back in. All wires are routed and tied down with zip-ties and cable clamps so nothing moves or gets caught in the seat brackets. The unit with all the RCA jacks (above the CD Changer) is my DSP signal processor. The black wires running forward that are not under the carpet are for the subwoofer that will go between the front console and rear seats.

With the passenger side rear seat in the down position the amp has plenty of room to stay cool. The seat can still be lifted to allow access to the jack as well.

Here you can see just how close the amp comes to the seat bracket... another 1/4" and it would not have fit!

What your looking at here is where the hood release cable goes through the firewall. With some modifications (and much resistance) I got the Monster Cable 8# power wire to go through this hole. The shaft with the orange sticker goes to the steering column/wheel for reference.

This is where my Stinger SE (AGU) Fuse Holder is, near the battery and main fuse/relay box. I used one of the bolts from the side of the ABS brake computer to hold it in place.