The amp is something like 700W max and the HU is 180W max. When it's turned up it is enough to dim the lights.
The UPS I tried was back when I was using a regular ATX power supply. The one I picked up had all the bells and whistles. Voltage regulation, line conditioning, battery backup, surge protection.....
I have to say I'm really impressed with the amount of help and advice being offered up. This is by far the best forum I've ever been on.