Great news,how to wire the C220 to 4BSST2
The McIntosh C220 has a Power Control - MAIN trigger jack (the ACC jack would also work) that accepts a 1/8" stereo mini phone plug. The McIntosh branded cable has a stereo plug, but I think it may only have 2 conductors. Either way, using the McIntosh cable or a generic 1/8" stereo phone plug cable will require cutting the plug off of one end to use with the Bryston trigger connection which uses a terminal block plug.
If you use a generic stereo 1/8" phone plug cable it would be a 3-conductor cable (2 insulated conductors + ground shield conductor). You would use the ground shield conductor and the insulated conductor that is attached to the tip of the plug (the center position on the plug is not used).
Connect those two wires to the 2 IN terminals on the Bryston connector plug and set the External Turn-on trigger switch to EXTERNAL.
Steve