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.
Hello and "THANKS IN ADVANCE"
Recently I purchased a pair of Bose 901's and 601's. I'm running the 901's with the Bose equalizer through speaker "A" connections. The 601's are through "B" connections. I'm scared of the warning in the 901 owners manual that says the 901 equalizer may damage other speakers. Does anyone know where to set my unused 7 band graphic equalizer as to better duplicate the bose equalizer? it"s range is +- 12 db starting at 63Hz to 12.5kHz.