JTECH SUB+BT Board, 2.1 Channel, Bass and Treble, DC 24V to 40V Dual Power Supply, Inbuilt Gain Control Hard Bass

JTECH 2.1 Channel Bass Treble Board This is an improved passive preamplifier board; the circuit incorporates an improved high Gain Control circuit, giving the sound rich detail, Increase High Sound Gain14.5'Db You may perform high and low Bass And Treble DC 24V to 40V Dual Power Supply