I have an APC 15 that I picked up for $238 to my door on a Black Friday deal and have been very happy with it. I didn't notice a significant change with it, but it certainly didn't degrade anything. One nice feature is that it has two outlets specifically for high current components (i.e. amplifier and subwoofer), but it looks like you have two subwoofers that might be one too many. I think you can reconfigure the outlets to add another one with the higher current allowance, but you'll need to confirm before making a purchase.