Alpine SWA 10 is on a pioneer gm-a5702 bridge at 4ohms pushing a clean 400watts rms to it. the box that it's in has a little bit of a port chuffing noise but I ordered me some brand new Port tubes and unplugged the second port and extend both of them and hopefully drops the tuning a little bit and that's it to play nice and clean no chuffing but for right now so far in person I have a lot of bass and it plays a lot deeper than the massive audio but not as loud as the hippo.