Aluminum Universal RCA Bass Knob 
Allows for bass level adjustment closer to the driver for convenience
Perfect for balancing the system to change music styles
Connects between the amplifier and stereo via RCA's
Works with most head unit / amplifier combinations
Available in 6 different colors!
     Specs:
1.25" x 1.25" x 3"
30" ECO RCA Cable
Over-Kill strain Relief Gland