AmpPRO simplifies the installation of upgraded amplifiers in data-bus controlled amplified sound systems. With AmpPRO, you can improve audio performance while keeping an original radio’s fit, finish and features. The APA-TOS1 is a fiber-optic audio output add-on accessory for use with an AmpPRO interface. The APA-TOS1 easily installs in your AmpPRO interface and instantly provides a digital Toslink output. APA-TOS1 is compatible with any brand and length of Toslink cable for connection into a Toslink equipped DSP, or amplifier. Simplify speaker wire connections when adding aftermarket amplifiers with our Speaker Connection Harness. Amplifiers can be easily added with no need to cut or modify a vehicle’s original wiring.