ITEM NAME:2 Pieces DX338A HIFI Preamp Pre-amplifier Tone Board Kits Volume Control AC 12V img *{margin:0;padding:0;.With equal loudness and through switch for improving sound characteristics. The circuit board has reasonable wiring, low noise, and beautiful component layout. AA-type tone circuit technology, capable of driving composite dynamic impedance load headphones, combined with attenuated tones.
