Quote: Originally Posted by
DeathChill 
Power Supply - Carnetix P1900 is what I hear, but then I heard the Mac Pac cable is *NOT* Intel compatible without soldering.
You hear wrong. P1900 is fully compatible with Intel mini. Soldering was only necessary in the old version and even then, it was in the P1900 itself, not on the cable.
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Audio- I am going to be hooking it up to my speakers, subs and amp and want good quality audio; I'm by no means an audiophile, I just want a nice sound.
Try the built-in headphone output first. If you are not happy with the result, start looking for an external USB sounda dapter (such as Edirol UA1).
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As well, is there software that will allow my Mac Mini to control my subwoofers level?
Probably not, this is typically set on the amplifier. A system-wide equalizer might be available.
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Radio - I still want to access my radio if at all possible, so is there some sort of converter so that my Mac Mini can tap into my radio? As well, what piece of software would allow me to control it?
I am not sure what you want. If you connect the audio ouptut to the AUX input of your car radio, you can use the radio's controls to switch the source back to tuner or CD. If you want to control this from the software, you will need to hack the butons or the remote controller for your radio and then use for example a Phidgets I/O board to simulate the buttons.