c.director

The most volume you can get would be 3.5 cubes with a 14.5" x 3.5" port 25" long tunes to 34-35Hz. (using you max dimensions).

If these dimensions fit this should work: HxWxD=16", 29", 25" Port: 14.5"x4"x21 Long (along the back wall) Tunes to roughly 35-36 Hz and gives you 4 ft^3 after all displacements. Plenty of port too. EDIT: Somebody might want to chime in on how they will handle 2000 watts on 4 cubes, but for the 1200 it will give you the most out of it.

Yea, on that design the port would need to be the height of the box minues the wood thickness on both sides, so if it was 16" tall and you were using 3/4" MDF, you would want to plan with the port height being 14.5"

go for 3 or 4 cubes for sure (after displacement), experiment with position in your trunk to see whats loudest. They will do good tuned to 35 hz, may want to make sure you have a subsonic filter set appropriately. Everything seems good to me.

Sonic Electronix, $70 I think, it's the cheapest I could find lol

Ive put two 12's in a rear deck before, probably not the best idea for 4k though.

Test Hook up http://www.youtube.com/watch?v=VKrzSoPVhxk&list=UUhDnHNzl7djuuMdz4zyTZyA&index=1&feature=plcp

Whats the reason behind this? isolator cuts the rear battery off from getting charged from the alt. so the voltage is going to be at like 12.8 and drop from there. once the voltage drops enough, something like in the 10's and low 11's, the isolator will switch so that the rear battery will be charging now. alts HATE charging dead batteries. it puts a shit ton of stress on them, since they're made to keep an already charged battery charged. no...Thats an isolator...This is a relay..which means that when the car is on the relay allows turns on and connects the two batts..So technically whenever the engine is running the batteries would be charging like normal and when the ignition goes off they would be seperated.... or so i understand I think this it too, you should be good to go if that's the case.

Whats the reason behind this? isolator cuts the rear battery off from getting charged from the alt. so the voltage is going to be at like 12.8 and drop from there. once the voltage drops enough, something like in the 10's and low 11's, the isolator will switch so that the rear battery will be charging now. alts HATE charging dead batteries. it puts a shit ton of stress on them, since they're made to keep an already charged battery charged. I agree there, I didn't realize the isolator switch's only once the second battery is discharged? I thought it isolates them when the vehicle isn't running, so they are always in parallel when the vehicle is running.

Whats the reason behind this?

doesn't this harm the agm over time though? And if so wouldn't the relay help protect the agm while the car is off? Idk the exact relay your referring too but yes

The paper work sundown provides say they are well suited to 4th orders.

2 16 in ports is what it means

If the box is vibrating your losing output anyway, so make the box strong and you'll be fine.

looks good, was there anything there before? and just get that cable tucked away!