1. The MQ-101 connects to the C26 as if it's a tape recorder, say on "tape 1". You then select your source with the C26's selector switch, and switch the equaliser in and out with the "tape 1 monitor" switch on the C26. Just avoid the "tape 1" setting on the selector switch when you have the "tape 1 monitor" switch pushed in, or you'll get a terrific howling feedback noise.
2. Switch the "tape 1 monitor" switch off as described above.
3. You can actually do away with the Niles box and use the speaker input/output connections on the C26, the connections should be very clearly labelled. The front-panel "main" and "remote" buttons on the C26 will then turn each pair of speakers on and off.
As far as the manuals go -- McIntosh used to send them out for free! So I'd start by calling them.
2. Switch the "tape 1 monitor" switch off as described above.
3. You can actually do away with the Niles box and use the speaker input/output connections on the C26, the connections should be very clearly labelled. The front-panel "main" and "remote" buttons on the C26 will then turn each pair of speakers on and off.
As far as the manuals go -- McIntosh used to send them out for free! So I'd start by calling them.