I think you missed the main point if my question. Sorry I was not clear. The 2313 has preamp outputs but sources internal to the reveiver ie airplay, fm, etc will not pass thru to zone 2. And this is also true for the 3313. You can play music from your iPhone thru airplay on the main speakers, but not on zone 2. If you notice on your 3313 pic submission directly above the preamp out is a series of external analog inputs for the preamp outs. You are restricted to these inputs for Zone 2.