MPJA is one of my normal places to go for "enclosed brick" style single output supplies. Pretty easy to use, and MPJA's prices are decent (though you can do better with used goods or clearance sales sometimes). You want a 12V supply for a car amp.
Depending on how much output power you need, just using your PC supply may be a good option since you already have it. Most PC supplies are spec'd to handle a beefy video card and processor which you're likely not using in a jukebox system, so that extra capacity could easily be put to use to power an amp. PC supplies are regulated, but may have some noise on them from the other PC equipment that may leak through your amp, depending on how well filtered your amp's power inputs are.
Easiest way to pull power off a PC supply is one of the hard drive "molex" connectors. Grab a SATA power adapter, Y cable, etc. and hack the end off to get wires, or you can buy the actual connector at places like Fry's (it's a 0.093" variant that will usually be identified as a "disk drive connector"). You only want to pull maybe a few amps off that, though, since it's only a single wire. Be sure to use nice heavy wire (like 18AWG).
A better option for PC supplied power is to use a PCIe connector or multiple HDD connectors. More wires = more current handling capability. The PCIe connector is a 6 position AMP 4.2mm PE series (also sold by Molex under the Mini-Fit series as well as several others). That'll get you 6 beefy wires. You can easily pull 200-400W off of that, assuming your power supply can deliver that much (check the ratings).
However, a simpler option for many people is to just use a stereo/AV receiver. These take line level inputs like from a PC and have speaker outputs which are often capable of driving 4 ohm car speakers (but check the specs). Power for these types of devices is simple: plug it into a wall or power strip.
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Topic: speaker selection questions (Read 3126 times)
