From the manufacturer Rockville RGHR45 4 Zone Marine Gauge Hole Receiver Bluetooth/Radio/Wired Remote 4 Zones! This marine receiver has 4 zones that each have independent volume control.

There are 3 zones for full range and a 4th zone for a subwoofer.

Here is how it works.

Zone 1 is the built in powerful 4 channel amplifier and zones 2 and 3Yo you can connect up to 6 additional channels using one or more external amplifiers and then you can control the volume in each of those zones both from the unit as well as from the included wired remote.

3” TFT display Our built in 3” TFT display is crystal clear and it makes it easy to navigate your tracks and settings.

We also include a rear view camera input as well as an aux A/V input.