Professional Tone Control Mono Bass Expander and Subwoofer

This is a kit professional tone control mono with tone adjusting : Volume , Treble , Bass Expander and Subwoofer filter. What the special? Tone is quite amazing control, tone control is modify from C828 Tone Control and combined by the circuit subwoofer filter. So that makes this circuit are very interested for audio enthusiasts. See Kit Professional Tone Control Mono Bass Expander :