Being the destitute home theater nut I was thinking about using some car audio equipment that I had sitting around for a makeshift amp and sub just to see how it would sound. (I wasn't overly impressed with the Velodyne CHT-12 that is within my budget). I quickly found the info that a car battery recharger doesn't work and that you need a regulated and filtered dc power supply. Well, my amp (Orion HCCA 225 - around 500 watts) can draw at the very least 30 amps peak. The power supplies I saw that supply that are like $200 http://www.sacramentoelectronics.com...directory.html Are there power supplies that will improvise for less? I'm not shelling out bills to test this out, but I'm curious. Now, I wonder do home amps/receivers use dc current amps and how do they manage if regulated and filtered power supplies are so expensive? I own one of the newer Onkyo's and I didn't know about the power supply issues with them until after the purchase. I wasn't aware of just what role the power supply played until my research for my little idea.