Headway EDB2 H.E Acoustic Pre-amp for for Guitar, Double Bass or Violin/Mandolin

Headway ~ Hearing Way Ahead. “The Swiss Army Knife for the Gigging Acoustic Musician” ( or two). Range Switches (HPF) for Guitar, Bass or Violin/Mandolin via each channel. Improved Class “A” Inputs & top Pro Audio Circuit – Producing a huge 32dB of Low Noise Gain.

eBay