After I bought my 5th Gen i picked up Subthump's X3 harness, sub box, and amp board to go with some equipment I had laying around.
Thread is here:
At the time Steve told me he was working on another harness to replace the BA amp. And he delivered. I picked up his BA amp harness kit to take my build one step further. I would keep the factory head Unit for now and upgrade my primary amp.
I had a new Discus 4 channel DSC480 in the box lying around. So I decided to use that. But one problem. It is huge. It would never fit in the factory amp location. So i could use SubThump's harness, but I would need to find a mounting spot for this big amp.
After crawling around in my trunk with the amp I found out I had just enough room to mount the amp on the end of my drivers side 10-12 inch sub box. The amp was too large to just screw on so I built a little platform for it:
I then ripped the trunk apart and worked though all the wiring. This took a while, but that was the easy part. I tested the new amp and all was well. Then I mounted the new amp on the sub box and quickly realized this monster was almost too big to fit into the trunk. After several aborted tries I finally got it into the trunk, but only after scratching the amp a little.
Then I pulled all the new wiring around and hooked up the amp. Then I tried to get it into position. It turned out my new amp board was a little too long to fit easily. It is a bit difficult to get the big sub box into position. With my extension it was almost impossible. After a number of tries and repositioning I finally shoved it into place. Phew.
At least it works!
While I had everything apart I decided to anchor the amp board. I want to try autocross and I think the G forces would start the amp board flopping around. That strap is anchored under the PIA plastic cap on the post you see in the pic. Not pretty but solid.
I fiddled around with my head unit tone and the settings on the amp to see how everything fit together. Okay, now on to my review of the upgrade. First eliminating the center channel did improve the sound a little. And the highs and mid range are a bit cleaner at any volume. But the difference is not night and day.
To take full advantage of the amp I think I need to upgrade the speakers. One other thing, the new amp really improved the stock system's bass (as Steve said it would). So much so now my 10 inch high end Kicker hits only slightly harder than the stock (jumpered) 6x9s. Probably I can bump the gain on the sub amp, but really there is no need. Therse is more than enough bass for the music I listen to. Usually I run my bass knob at 1/2 volume.
The end result here does sound really good. But my chimes are a little loud.
I did learn something. I think I can buy a 5 channel mini class D amp like the Alpine PDX-5 and get the same sounding results. Perhaps I can fit it into the stock location. So if I go this way I can return my sub box to its original size and save about 30+ pounds with getting rid of the two big amps and the amp board.
For those of you who do not have Subthump's 10-12 inch sub box already buy this:
The Infinity is a great amp for the $$ and this setup will sound great and save you a lot of trouble. If I was starting over this would be my choice.