So you just want to use The MAC 1700 as a preamp? It has main and remote speaker switches for both pairs of speakers but there is no preamp out to use your MC 2105.
You will have to move to a MAC 1900 or later for preamp out or even better get a preamp/tuner combo like the MX110 since you have an amplifier already.
You will have to move to a MAC 1900 or later for preamp out or even better get a preamp/tuner combo like the MX110 since you have an amplifier already.