ZDACT – Specialist controller for use with the ZDA4.6 digital signal processor and amplifier The ZDACT is a specialist controller for use with the ZDA4.6 digital signal processor and amplifier. This controller gives you the ability to control volume and other pre-set functions from the front o It also features a USB port giving you the option to connect your PC in the front, without cables running through the car when making your DSP adjustments to the amplifier. Product Specifications: Compatible with the ZDA4.6 4-channel Amplifier Controls volume and other pre-sets Connects to PC via helpful USB functionality