what would be my safest bet on wich amplifier to use on three 10" L7's dual 4ohm, at the moment I am running a ultimate T3-1000d but I think they should handle quite a bit more? I will post pics of my box that I built for them tomorrow, but the outside numbers are 36"wide x 17" high x 24" deep, with each sub having its own chamber and the ports are 3.5" wide by 19" long I figure that each sub has about 1.6 cubic feet and tuned to around 46htz

 

I'd say you are looking for 2000w @ 2.7ohms, so about 2300w @ 2 ohms.

Personally, I'd get a 4th driver, wire em to half ohm and get a Powerbass 2400d :P...