The DLS CP-EBC is a level controller that can be connected to the HLC4.2 line converter. The line converter automatically sums channels 3 & 4 when the level control is connected.
A very nice accessory when HLC 4.2 is installed after the car's original player and after this an amplifier is connected to control the subwoofer. Adjusting the sub level doesn't get any easier than this
