fiber optic output goes to a separate digital audio decoder or processor's input,
there are no amps that i know of that will accept a fiber optic (toslink) input. not to say it cant be done but if they are available they would be extremely expensive and hard to acquire. there are some higher end zapco amps (if im not mistaken) that will accept a semi-propietaty SPDIF digital audio connection but I am sure I have the wrong brand name in mind. its been a while since i have heard anything about that. its is pretty lame considering almost all home theater setups use some form of digital audio or video connections. why is the ICE (incar entertainment) industry so far behind? its not a durability issue, in fact, digital connections would be far less succeptable to road noise and interference. i say we all email the big 3 (sony, alpine, pioneer) and tell them to get on the ball.