Shahinian Oblisk

Your question is a little unclear, but I'd guess the OHM setting you're referring to is on the amp. If so, determine from the manual or the website what the nominal impedence of your speaker (expressed in ohms) is, then use the speaker terminals from your amplifier with the same or a lower impedence value to hook up the speaker wires. In the case of the Shahinians, they have a nominal 6 ohm impedence, I'd suggest using the 4 ohm terminals.

Rcprince,

Yes, you are correct. The McIntosh amp has a choice of ohms level for connecting the speakers. I will go with your suggestion and use the 4 ohm terminals.
Can you explain what effect the a 2, 4, or 8 impedence has on the speakers? Does it have any influence on the reproduction of sound from your speakers? This is new to me. My old amp, a Bedini MK100 did not give me this choice. So I am hoping you can explain this to a novice like me. Thanks in advance.

Kgk, Rcprince is right on with the 4 ohm tap. The "OHM" is the resistance your speaker presents to your amp. By selecting the proper tap on the back of the Mcintosh, the amp will run in its most linear state. That's a good thing. If whatever speaker you use is between the 2,4 and 8 ohm taps, use the tap that is the lower of the two. Enjoy.