Preamp Tone Board 2.1 Channel Sound Source Processor Equalizer Sound NE5532

This tone board uses 4*NE5532

This board is compatible with JRC4558, AD827, OPA2604. Different opamps can be upgraded according to personal preferences, and the tone style is different.
This board has 4 5532, of which 2 are used as the sound effect beautification and amplification of the left and right channels, and the other 2 are composed of 4-stage low-pass filtering subwoofer output.
The frequency can be adjusted from 50HZ to 150HZ.
Potentiometer spacing, 20-20-20-20-30mm,
Voltage is AC double 12v to 18v