Looking for advice on McIntosh Amp hook up.
 

This applies to most Mac Amps, but mine will be MC611 mono amps. It has three sets of post per channel – 2, 4 and 8 Ohms.

My Speakers are PMC Fact 12. It also has 3 sets of posts LF, MF. And HF.

I would like to connect 3 sets of speaker cables. But I do not know which one should go to LF, MF and HF.

Or this kind of set up is not recommended.
https://i970.photobucket.com/albums/...er99/MC611.jpg

http://i970.photobucket.com/albums/a...0Fact%2012.jpg

Either a single speaker cable run using the existing binding post connectors (as per your picture) or purchase a tri-wire speaker cable.

IMO I doubt you will hear any difference.

With my 2-way speakers I use 2 identical pairs of WW Eclipse Mini speaker cables. At the amp end, both sets of speaker wires go to the same speaker terminal. At the speaker end of things the shorting bars are removed and one set of speaker cables go to one set of terminals and the other set to the 2nd set of terminals. Your set-up would be the same, except you would run 3 identical sets of speaker cables from the same terminal on your amp since you have 3 sets of terminals on the speaker.