Features 1.Three way adjustment type: (treble + bass + total volume) 2.Adopted of high quality electronic components, and precision process, ensure for the durability 3.No power supply, the heating stage front stage tuning board 4.Tone board can adjust the total volume, high voice, low voice, suitable for effect board and high-end stone machine with attenuated passive tone board 5.Only change treble and bass, without affecting the original tone quality timbre Specification Features: Three way adjustment type: (treble + bass + total volume) Adopted of high quality electronic components, and precision process, ensure for the durability No power supply, the heating stage front stage tuning board Tone board can adjust the total volume, high voice, low voice, suitable for effect board and high-end stone machine with attenuated passive tone board Only change treble and bass, without affecting the original tone quality timbre Specification: Channel type: dual channel Adjustment type: three-way (high + low + total volume) Volume control: total volume control High pitch adjustment: 10KHz (plus or minus 10db) Residual noise: < 0.1mVac Input resistance: 100kΩ The output resistance: 600Ω Audio input: 301-3P terminal Audio output: 301-3P terminal Phi with respect to installation size: 76mm (2*Dia.3mm) Weight: Approx.32g/1.1oz Package list: 1 x Passive volume control board Package List