Well actually here's the idea so far, Getting 4~15" or 18" Icons and running 7k to them. Adding a couple new batteries. Either getting another AQ3500 and strapping it to the one I have now or, Selling it, and getting a different amp. The amp decision would dictate the coil configuration so, I guess I need to solve that issue once I decide exactly what sub I want to run next. Kinda on the fence on this. Either 2 ways about it, I wanna break 150 with some "basement of hell lows"! I love the sound of the Icons I have now and don't really have the $$$ or power to run Zcons. So, I thought I'd put the new series of Icon up to the challenge. The new enclosure will surely compliment the new Icons. I just need to sell The R/F T1500-1bd I have now and make a choice on the amp I want to use.