I had some power problems too when I started turning up the stereo. I ended up just getting a 1000uF cap rated at 20V and stuck it in parallel with the main power in back of the empeg, and all seems to be good now. It only cost $3 at radio shack. Seems to keep the voltage up above 10V. I don't think it needs to be a huge 1Farad cap because the Empeg only draws 1 Amp of current. Try out this cheap solution before spending big money on others.