Ultra Digital Subwoofer Surround Center Board.Used in Original Ic 4CHANNEL Stereo Out .Inbuilt Sub Sonic Filter(Low Pass Filter 35hz to 300hz) Volt Dc15v to 40v Max Dual Supply

Stereo To 4 Channel Output Inbulit Surround + L.R+ CEN Out Subwoofer Prime Output Gain Adjustable Preset Inbuilt Subsonic And Low Pass Filter (35Hz To 300Hz) USE IN LM324 Texas ORIGINAL IC Volt Dc15v To 40v Max Dual Supply