Thought I would come back a few years later to drop an update on this project.

I ultimately ended up ditching the .50 cal ammo can for a .30 cal can which is almost half the depth and almost half the weight. I also ended up changing to a dta-2 amp and a 3.8ah Li-ion battery pack along with bluetooth 3.0

This setup is about a 40% reduction in size and 60% reduction in weight without a significant decrease in sound quality and battery life is still killer.

The bluetooth range is pretty limited mounted inside the box but as long as its close by all is good.

After tons of tinkering and lots of parts swapping I heavily recommend this setup.

Links for components below:

http://www.amazon.com/gp/product/B002IA9MYK/ref=oh...

http://www.amazon.com/gp/product/B007RQW5WG/ref=oh...

http://www.amazon.com/gp/product/B008AGQMQC/ref=oh...