Ken, the sound sounds like R2D2 at a very low level and only last less than a second. It has been some time since I did any testing, but I was thinking I heard the noise the very first time I played anything, whether the Auto mode is on or off. Either way, I think the noise is normal and something internal waking up. I know Alan talked about a special/nifty little circuit built into these new 350's the gooses the performance and makes it Almost as good as a 500 in some respects. \:\)

M80s VP180 4xM22ow 4xM3ic EP600 2xEP350
AnthemAVM60 Outlaw7700 EmoA500 Epson5040UB FluanceRT85