In another post I was directed to the Denon AVR2105 (or possibly the AVR1905) as a more economical answer to my needs. The difference between the two units appears to be mostly that the 2105 has Denon's auto-setup feature, where a microphone automatically balances the channels. The price difference is about $150. My question is whether there is anyone here who can offer an opinion as to how the auto-setup works and whether it's worth the cost. BTW - A friend of mine has the AVR3805. At twice the price of the 2105, it does NOT include the auto-setup mirophone which is listed as 'included' with the 2105. Curious, I thought. Does that suggest that with better units the owner is more likely to set up using meters (or just ears)?