What ohm to set amp


I have the Sonus Faber towers with matching center. Running a Marantz AV7005 with a Mcintosh Mc205 for power. I've read in a couple of reviews, where the towers were running at 4.1 to 4.7 ohms and the center was running at 6.2 ohms. They are 8 ohm speakers, can I run it at 4 ohms? My friend said I can run them at 4, but couldn't tell me if there would be issues down the road.
kalbi23
If you run an 8 ohm speaker on the 4 ohm tap there will be no reliability consequences, although it may not sound right (which is a different matter).
I went over to the Mac site and the amp is rated for 4&8 ohms. If you'd like detailed info or any info really, e=mail Chuck Hinton of Mac. He can answer most any question you have.