I misunderstood what you were saying. When I replied I thought you were just wanting to keep you 730 and redo the rest of your system.
Like you probably already know, I think the JL cleansweep only works when your running the cleaned up sound to an amp. But honestly, they're not going to tone down the Alpine premium sound system
If they can make it sound better otherwise. Most factory premium sound systems just can't handle the power it takes to have good sound quality. My old Infinity (in my 2dr) claimed to be "378" watts... Yeah, that's not rms, that's probably just the max wattage. So your alpine system is probably like that... But I'm in the dark really. I don't know anything about that system.