Hey that sucks that you didn't get your power supply! But you can use any 12V DC power supply as long as the tip is (+), in this case it's the inner part of the barrel connector.

I run my Empeg (Rio Car) into the AUX in of my Pioneer 9200R it sounds great! I can't tell between it and a CD! (My files are encoded at 192kbps CBR.
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Ben Rio Car 10GB + 60GB Toshiba ([green]Green[/green]) - Serial # 30102833