Pick-Up Guitare Acoustique K&K PowerMix Pure XT MiniPowerMix Pure Mini XT The PowerMix XT Preamp is a 2 channel, belt clip mixer that allows you to blend the two pickups of the PowerMix System. It features extremely low noise operation and can process high input peaks without distortion and offers an incredible dynamic range. Aside from its strong bass, midrange, and treble filters (for each channel), it offers internal gain adjustments which set the pre amplification factor from 1 to 10 (per channel).