Alright, so I found someone that is selling a zx750.1 for 200$ cash. And I can take my current one back to BB and get 190 plus they will refund my service plan so I can pretty much trade straight accrost. I was looking at the zx750 specs and it looks like the only bad thing is that there is no sub-sonic filter on the amp or on my deck, so trade anyway and keep the gains low? Most songs dont have below 30hz anyway so will I even have to worry about it?