I was wondering because I plan on installing my 4 channel amp and D class amp under the other seat, if theres room of course.

My 4 channel measures 14.9"L x 9.3"W x 1.9"H.

Forgot to mention my truck is a 2004 F150 STX 4x4, single cab, rubber floors, cloth seats.

 

If you don't already have a subwoofer under there, it should fit, but I'm just guessing. Don't know about the heat dissipation though...To answer your question though, NOT MUCH!!! oops, I don't know about the Super-Cab's...

 

Im not putting a subwoofer under there, just the amps.

 

Then width, height, and depth-wise, it should fit...Again, don't know about the heat dissipation...Might melt your seat or floor if it gets too hot.

 

Well, Ive installed a bunch of amps under seats before when I did installs for a living and we always put spacers underneath them to keep them about 1in off the floor.

 

cool...good luck