Originally Posted by raidmaxGuy
is it remotely possible to run a 70w 2 channel AMP off of the 12v leads on a psu?
Yes it is possible. Just make sure the PSU has enough power available to the connector you siphon power from. 70Wx2 means you need around 12A of power. Of course that's continuous and it may need more peak, so go by the fuse in the amp. That can also tell you the quality, because I've seen lower wattage units with high amp fuses meaning they can peak nicely, and I've seen higher wattage units with low amp fuses that can't even handle the wattage number, meaning they are crap and overrated units (just like some PSUs, heh).
If you do not yet have the amp and just want a cheap way to power some speakers, there are better ways to do this. One is to find a used receiver. Last year I picked up a Yamaha receiver that was probably 8 years old and originally sold for around $400, for around $30 fully functional. You can also buy small desktop amps these days. Look up T-amps at PartsExpress.com. They start at $20 for a fully functional Lepai 20Wx2 unit which is sufficient for desktop use. They have 50Wx2 Dayton units for $100. They even have a 15Wx2 Dayton unit that can run off batteries for $35. T-amps have really good efficiency and quality output. Heck, even audiophiles like them (after they mod them - can't leave good enough alone).Edited by Zap - 2/8/11 at 10:36am