Hello and "THANKS IN ADVANCE"

Thanks Cleeds. Yes, the 601 don't require an equaluizer, but I'm scared the 901 equalizer will damage them. I've been keeping the volume down when I listen to both 901 and 601, and turning 'off" my "tape monitor" at high volumes as to not run the 901 equalizer process through all speakers. can i just eliminate the 901 equalizer, and replace it with my 7 band equalizer?

The 901s need equalization, the 601s don't. The only way to run both properly would be with two stereo amps with the 901 equalizer only connected to the amp driving the 901s. It doesn't matter what equalizer you use, it can only be one or the other, not both. 

This feels like going back to the 70s,  or do they still make the 901s.

baylinor

... do they still make the 901s

No, Bose stopped making them a few years ago. The 901s had a long run, though, even if many audiophiles didn't approve.

I think @russ69 is correct has to how to connect both the 901s and 601s at the same time.

A friend of mine had some 901s hanging by wires from the ceiling  in the mid 70s. For what I knew then, they were awesome. Enjoy.