Heres my audio build thread.
Truck-03 Supercab FX4 5.4 L with 305-70-17 MTR Kevlars
Painted Calipers
Big-3
Dual straight pipes(no cats)
CAI
Switchblade Grill
Hood scoops
and many more


Audio upgrades
Big 3(All 1 ga. mining wire) (350 amp fused wire to amp d-block)
All amp wires and dblocks (1ga mining wire)-250amp fuse and 100 amp fuse
HU- Alpine CDA 7894, KCA 420i, C701 Processor
Front- 6.5 Focal K2 Powers
Rear- 6x8 Alpine R's
Subs- 2x Full size 10" Type R's
Amps- Focal FFP 4100(95x4 at 4)
Amp - Rockford Power Series T1500-1bdCP (1932 rms at 1)
Custom Enclosed Under seat box - 2 Type R's with approx .74ft^3 per sub
Custom Amp Rack
Custom Rear seat(refabbed)

Here is what I am working on



Headunit and Options
Alpine CDA 7894 (AMAZING SQ and Options) also the green matches the 03's factory lighting. 3 -4V preouts


KCA 420 for Iphone's and Ipods



For the Box
Start of the design.


Here's when I finished the frame and internals of the two 10" type R's box

Notice the down firing spec. By going that route I had about 5.875 top mounting depth.

Also note how I countersinked them about 1/4 ito the MDF to help with some depth

 

I used an old Type R I blew as a guide to go by. Also helped out with making the proper baffle

Heres the double baffle which will serve as a mounting place for the legs to lift the box to give room for excursion of about 20mm.

Heres the ("legs") on top of the baffle to give room for the Xmax

With carpet on it fitting into the back seat slots.

Legs holding it up to breathe and not hit the floor

Notice how flush it is to the rear seat(11.25inches)


Next I upgrades the "big 3" with 1ga mining wire. Then ran the same wire to my dist block for the amps.


Now for the back seat amp rack since I got these in:

Notice the two brackets holding the back seat to the cabin. I had to refab this part to make room for the amp rack. Heres a shot of what I am talking about

 

Now to the welding and bracing part for the back seat frame.
Obviously this requires a welder, heres the one I used.


I had to cut some of the old framing for the back seat off to make room for two 15inch wide amps. Once I cut the excess of I re-welded some steel rods for support(two places where the back seat is held to the cab)



Once I made room it was time to fab the MDF amp itself.
Here is a few shots of the amps being couternsinked into the MDF to leave room for the seats





I also used the amp rack to hold some bolts for a distribution block. I hate paying crazy amounts for stupid fuse blocks and dblocks when you can make one this simple. I used a copper bar on the rear countersinked(covered with plexiglass) to attach a 250, and 100 amp fuses. This was all done with 1ga mining wire.

 

Heres a few shots with the amps in place





I didnt have much room to work with

Made a built in slot to hold relays, and fuses for; Fans, Heatsink Fans, and a better Remote signal(this has a sliding place for a piece of plexiglass)

More relays and switches hid to run 30amp for lights and 4" Vent fans.

I used L brackets to mount it to the stabilizing bar for the cab

 

Final touches





ENJOY and Comments/Suggestions are welcomed.

 

looks great!

do you have any more pics of your big 3 upgrade?

 

thanks, and yea I do. I can post a few more if you need them. Are you looking to upgrade them?

 

Looks good. Love the amp rack.

 

Thanks guys. It took lots and lots of custom fabbing. The measurements took FOREVER. If anyone needs specs on the sizes of the box or amp rack let me know. Hopefully, I can make it easier for the next person to tryies to do this.

 

yeah i was looking at doing it, but im unsure if it would even be worth it or how its done.

 

My problem was, I didn't even know that it could be done. I had never seen anyone do it. Also, the depth is only about 3 inches, even after cuting some the the seat tubing. So I had to pic my amps accordingly.

Let me know if you decide to do it, I could probably help out with some specs. Took me about 3 full days to do the complete install

 

Does the seatback really have to be modified to put amps back there? I'm planning to do this next month (2 amps, 2 subs, 4 speakers). It'll be a mostly Alpine system.

Was it difficult to run wires to all the doors?

 

The seatback is a tough build. The seat hooks(two, one on each side) limit where you can mount the amps. Moreover, it forces you to place the amps in the middle of the seat where the back support is holding the seat in the middle. It a large tbar fram that is connected to the seat frames. Without the middle back support, your seat would push in and fold if it were to have pressure on it.

Hence, for longitudinal (height) you only have about 9 inches to play with. For latitudinal(without modifying) you only have about 18 inches. For depth, you will only have about 1.5" on the bottom where the back support is. Furthermore, making an amp fit in that space is about impossible.

With that said, I don't dont think it would be theoretially possible to find any size "true" 4 channel amp back there, let alone two high powered amps. Also, don't forget air flow. Those AB four channel amps get really hott and need all the room they can get.

Conclusively, yes I think the seat should inevitable be modified. If you get an alpine amp to fit, Id love to see that.

I just wouldnt chance overheating my amps. When you have about 2K behind the seat, you want to give them all the proper air and not have your "METAL" seat back hitting them.

 

looks great!

 

Thanks