Uhhh I'm getting sick of these almost incoherent ramblings by vsmlibs. A >40A power supply is a bit of an ambitious project for a beginner and as Wolfe said, by far the best idea is for you to try to find a 12V PSU on ebay. You could try using a lesser rated 13.8V PSU such as those sold for CB radios which you can usually get rated up to 20A. Be aware that your amp will start clipping a fair way below it's maximum volume if you use something like this.
Well, 45a would definitely not be a constant load. 45a would be the maximum load. That stated, it's possible that a 20a power supply, coupled with a big capacator or two, could be perfectly capable of running the amplifier. It might be interesting to try and run the amplifier of a computer PS. As for the wiring being too thin, much of what's done in car amps is completely absurd, and even entirely for appearance. Admittedly, you shoud probably use several of the power leads joined together, but as long as the leads are not very long, it should be fine. vsmlibs...... WTF?
Indeed. I'm not a fan of switching PSUs for audio applications, but it's more than likely that the amplifier itself has a switching power supply in it to reach it's output power rating so it should be fine. You may find that the PSU shuts off though if you have some fat capacitors on the rails to help with the peak current situation. I'm struggling to find anything wrong with the info on that link, it's all perfectly fine so what are you talking about them being wrong?
