try audioassult or caraudio direct . . .they sell rockford iirc.
you want hair tricks . . .are you going to be walling / no wall in stall?
as i doubt 2 x 12" woofers would be up for the job!
i had 6 in a tunnel box and it would just about make the Mrs hair flinch...and Liam B who had 6 in a wall, that would throw anything around!
your going to need about 1.5 meters for TB3!
and as for the "bass controller" the ones you get, that plug into the amp arnt worth it!
your either going to want an RCA split bass booster, to allow more power done the RCA cabled! giving a better signal or something that an Epicenter! <--- that being your best option!
im going for a new install at the moment, looking at 4 x 15" Orion HCCA in a wall install! and will be getting an epic for that, for certain!
http://www.caraudiodirect.co.uk/audi...-epic-160.html
thats the one ill be getting!
you can pick them up 2nd hand for around 150-200 bucks!
remeber power caps are crap.
and for the 2nd battery, well, ive never done split charging systems, but if your going big, id reccemend it! just remeber to use the right size fused circuit breaker!