Opinions on BTL 15 vs. current setup.

[931yota 0]

Off the top I want to go ahead and thank anyone for any help they give since I am a new guy on here.

I want to get some opinions from some people familiar with Fi before I change my current setup in my car which is a 2000 Toyota Solara. I am currently running two Soundstream T4 Tarantulas in a 4.5cu. box powered off of a US Amps MD2D (2004 model). I have an optima yellow top up front with an extra batery in back along with the Big3 and 0/1 gauge for power. Also have a seperate eq w/ 8 volt pre outs. The last time i metered it was at 141db. (42hz peak)

I am planning on running 1 BTL 15" powered off 2 US Amps MD2Ds in a 4- 4.5 cu box tuned 30-32hz. I will also add another Optima. What would be your opinion on this change, is it worth it, think it could register more, etc? I appreciate any help guys. Oh and it will be ran daily for music not just spl of course.

[BKOLFO4 29]

What size are the T4's?

4.5 each, or for the pair?

Sealed or ported?

[931yota 0]

Woops sorry thought i listed that. The T4s are 12" in a box that is 4.5cu for the pair and it is ported. box tuned at 32 hz peaking in the car at about 42