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5.1 Preamplifier independent channel volume and low frequency adjustment DC power supply 12-24V PRE51. Used in the pre-amplifier, send cable 6 volume independent adjustment, convenient positioning adjustment, adjustable bass frequency, solves the problem that some pre-stage players are not convenient to adjust   Electrical parameters: Input power: DC power supply 12-35V, current is about 10MA. Input signal: 5.1 input 1V Output signal: 5.1 output 2V   Features: Automatic mute, used for the power amplifier board, the installation is very simple. Multi-channel power amplifier modules are muted to reduce most energy consumption. There is no total volume adjustment and it can be adjusted on the player. It is also possible to add a volume potentiometer.