I am the proud new owner of a Denon 2802. In performing initial set-up I used the internal channel level settings. As it stepped automatically through the speakers I noticed a difference between LF and RF. I reduced RF and let it go through again. After several passes through I began to realize that it was not primarily the level that was different, it seemed to be the spectral content, LF seemed to have more lower freq or be shifted down while RF had more HF or was shifted up in freq. I performed troubleshooting and isolating procedures swapped wires, moving speakers and so on until I had both speakers side by side (also top and bottom). The difference tracks with the receiver channel. I don't think that my hearing is particularly exceptional, in fact my hearing is not all that good so this must be pretty obvious for me to even notice. I took the receiver back to my friendly local retailer who after setting up and listening for a few minutes was also able to hear what I heard. We then listened to another Denon receiver and could hear the same thing. So here are my questions. Has any one else noticed this? Is it a big deal? Is it the noise generator or is there a genuine sonicspectral difference between the amplifier channels? What else might it be or might I do? The LF and RF are Infinity Alpha 20's, the center is an Alpha 37c.