I assume you mean a separate external equalizer. In order to do that you have to have access to the individual channels between the decoder/preamp and the main amp. Many higher-level A/V receivers have "preamp out" and "main amp in" connectors that a...
You can safely use all the speakers if your "stereo" is in fact a 2 channel system and has built in to it an "A","B","A+B"speaker selector control. If so, then connect the: A- 8 Ohm speakers to the "A" terminals on the back of your stereo. B-Connect ...
I believe that receiver is somewhere around 10 or 11 years old. I use to sell it when I was an A/V salesman. I think that was the last year Yamaha included the "V" (for video) in the name for its stereo receivers. It is somewhat the equivalent of the...