get the t10001 bd amp its rated at 1400 watts if u have ho alt t20001 is for 2 t2 subs you will destroy 1 t2 with the 20001 bd because you will be giving a 1000 watt sub 2600 watts with a ho alt
whatever u want.. like lil jon brought up though (i think) make sure your charging system will handle it.. with the 4000bd your lookin at like 300 amp alt you will want isolated batteries too so thats additional costs but if money isnt a factor get the 4000bd and 4 T2's?
Lol. Yea, you'll need a bigger alternator. And if $ isn't an option, then why not go with Zapco 4kw or two C2K9.0s? I run two Eclipse DA7232's at 4kw a peice... But I have a lot of upgrades to my electrical system, and it's still not enough...