thinking of trying the arc ref 110

Any users out there that have advice on this?

I am running Wilson Benesch ACT speakers (88db and impedance is 6ohms nominal 4 minimum) with a ARC ref 3 pre and a Levinson 432 amp. The room is a 13x13 living room open on one side to an adjoining dining room. I have heard of great things about the ARC ref 110 but have not heard it myself.

A couple of questions for users:

Based on my current setup, I am wondering about the difference in midrange and bass definition if i switched to the ref 110.

How closely do you need to match the impedance on the speaker binding posts with that of your speakers?

I understand it runs cooling fans with a selector switch - how irritating are these and how loud are they during silent passages? Also, how hot does the unit get? I am assuming most users turn their amps off or put them into some kind of standby to preserve tubelife.

Any advice would be welcome from those familiar with the units described above. Thanks