AudioControl D-4.800 4/3/2 Channel Amplifier with Matrix DSPAudioControl has paired our award winning amplifier technology with our powerful Matrix DSP into the D 4. 800. This single unit solution provides unprecedented power and tuning flexibility when you require audio perfection from your factory or aftermarket sound system. The D 4. 800 features active speaker level inputs, line level inputs and outputs plus, using AudioControls DM Smart DSP app gives you complete control over all features including 30