They're suggesting outputting DTS over a single optical output. Great in theory, it's a 1.5 megabits per second multi channel lossy codec so actually sounds rather good. The problem is you'd have to licence the encoder source code from DTS and then integrate it into your DSP source code. It might be do-able, but I doubt it would be cost effective.It's just not defined as 4 or 5 channel. Unless you mean 2 x optical but then all the crap "receivers" would need a 2 x optical input...... Or am I somehow nuts and missing something late night?