Install this PAC TOSLINK fiber-optic add-on accessory into an AmpPRO interface for high-quality audio performance. The APA-TOS1 is compatible with any length or brand of TOSLINK cable, creating a pure digital audio output that is less susceptible to hissing and other interference. This TOSLINK fiber-optic add-on accessory creates an instant TOSLINK output for your aftermarket amplifier or DSP. | Pac | | TOSLINK Fiber-Optic Audio Output for AmpPRO Interfaces | Black | Best Buy