Picked up three little Marantz on spec yesterday. One of the 2216 works great...the other powers up but no sound. The 2215 powers up and hums...looked inside and FILTHY. Anyhow, a couple of project units. Interestingly, as a novice I had never had a chance to compare, the 2215 is significantly larger physically than the 2216 and completely different inside. Can anyone explain why that was so?? Also, the 2215 is the more golden tones face as compared to the really bright silver 2216...the bright silver being the same as all other Marantz that I have.