ZLD MKII | Zone Controller / PreampZLD MKII takes marine audio to the next level with high definition signal processing and independent zone control for cabin, tower and subwoofer level control. The MKII is redesigned from the ground up. We wanted to make the MKII a true statement piece for your boat. On the outside, the controls are separated for independent zone control (Cabin Tower Sub). The controls are LED illuminated and push button "pop up" style for simple control. Input gains