if you plan on using external amp for audio via the "headphone jack" you can completely omit the +12 too.
Interesting. So you could just use a 5V P/S. Which brings me to my original question. How many amps are needed. I looked at the manual but that doesn't mention minimum req. for power.
PS. I always use an external amp, but a real small one, just the circuit board type. Only because I find it very easy to adjust the volume with a pot rather than going through the menu