No my highs and mids are not on an amp yet, but I have a phoenix gold waiting for me at home when I get from vacation to put on the mids and highs. But as it is now its just the sony xplod radio on mb quart speakers. Yes with the U.S. AMP 1600.2 the bass was sick and you could only hear the bass at high volume, it was awesome bass, which is why I was going to add an amp on the mids and highs. But the polk is no where near drowning out my sound. The subs that are in right now are cheapy sony xplodes 10 inch 150 watt RMS 300 max and they surprisingly are very clean and strong. I put these in for vacation, the subs I want to use are the ones at my house but they are 1.6ohm in parallel rockford fosgates P1 made for the HUMMER by GM. Very low ohm subs. THey are ridiculous and slam like no other sub I have heard in a while but the low ohms scare me, less then an ohm each sub SVC. I figured I would see if the amp can handle the sonys, then throw them to the Fosgate wolves, but overheating on those worries me.
I do have good wiring, 4 guage for power and ground but I am using really thin for the speaker wires, maybe need to increase the size of that. Yes the U.S. AMPS are great, it was pushing about 400 watts x 2 at 2ohms RMS so would think comparable to the Polk but not really I guess. There AX series are top notch competing with the best amps and there old amps, but even the xterminator and newer amp by RE are solid and perfect for the price range. My older xterminator that I was using was class D, maybe that can be an issue too, but I dont think my cheap SAS bazooka was class D.
Would a larger fuse at the batter help? What size should that fuse be? Maybe I should get thicker wire, better wire. This should be more watts then my other amps outside of the U.S. AMP but it ran the sonys fine, but could not handle the two fosgates for more then a couple hours because of trying to push less then 1ohm in stereo, pretty tough for any amp lol.