Features： 1、Dual Operation: Tonality controller high performance, low noise, dual operational amplifiers, integrated circuits are similar to many standard operational amplifiers. 2、Low Noise: Power amplifier tuning board has better noise performance, output drive capability and relatively high small signal bandwidth. 3、Good Contact: The input part adopts double linfa seats, in order to be better compatible with other power amplifiers, with good contact performance and long life. 4、Wide Voltage: On the power input, a wide voltage power supply is used, and the rated voltage can be balanced on the dual 12V, IC, and the power supply is stable. 5、Wide Application: Pre amplifier tonality controller is suitable for application in professional musical equipment, instruments, control circuits, etc. Specification： Item Type: Pre Amplifier Tonality Controller Material: Plastic Power Supply Requirements: AC Dual 12V ± 2V Power Consumption: 5W Appearance Size:Approx. 100 x 60mm / 3.9 x 2.4in(without Knob Protruding Part) Installation Hole Distance: K=M3, J=Approx. 53 x 93mm / 2.1 x 3.7in Front Chip: NE5532 Input Interface: Standard Linfa Socket Output Interface: 2.54-3P Number of Channels: Two Channels Speed Control Type: 4 Channels (Treble,Midrange,Bass,Total Volume) Package List： 1 x Pre Amplifier Tonality Controller 4 x Knob Accessories(Sets )(3 Small Pieces Per Set) 1 x Cable