Darrell,
If you look at the lower left area of the front panel of the AV10, just right of the power button, you will see the buttons for the A/B speaker selection. Also, if you look on the back panel diagram on the specs page, you will see two sets of binding posts for the main left/right...
Nakamichi AV10, for 2-channel audio quality. In addition to the points made above, it has TWO power transformers for the multichannel mode, and can output 20 amperes in stereo mode. I have the AV500, and I haven't found another receiver that can approach it in audio quality. You have to hear one...