The 1705 doesn't have pre-amp outputs. That makes it pretty hard to hook it up to an amp. You would need to find something to turn the speaker level outputs into a line level RCA output (they do make these and they were on the site not too long ago just can't remember where).
I'm guessing that you wanted to run all channels to the amp, if you only wanted a couple of channels for a home audio set up you could more than likely use the zone 2 outputs.