I'm looking to improve hifi playback quality for my 'living' room system. Initially I'm looking to plug my old Pioneer A400 amp in to the preout connection on the back of the Yamaha AV amp to see if I get any stereo CD playback improvement. Wouldn't be hard it has to be said. Anyhow the first question I have is - will I do any harm to the amps doing this - obviously I'm talking about using the perout connection on the AV amp and putting it into something like the AV in or CD in connection on the A400 amp. Will this work or is there a better way to do this without causing damage. I suppose the second question would be "Is the Yamaha actually any good as a preamp"? I have designs on moving from the A400 which will obviously be fiddly to get to work properly (ie its integrated!) to a dedicated power amp - possibly a Roksan or equivalent. Again though how do I get the components to match without destroying the surroudn effect?? Any advice or experiences very welcome!