Our new Demo room featuring Magico M2 and Dagostino Momentum

This is where the complications come in. I need to build a dedicated room for these speakers (if a like them after giving them few auditions: the only Magicos I've listened to are the S3 MKII). Once I decide on the speaker I need to do some research and find the "optimal" size for the room (this is the reason I was asking about room size for these speakers). Browsing some audio sites some places recommend a ratio based on width of H = .6xW, W = 1xW, and H = 1.62xW. Some other sites use other ratios to come up with the "ideal" room size. 

I live in southern CA.

You should connect with Scott Walker Audio....  He does a good amount of Magico and probably is not too far away from you.  I know he's done both M2 and M3's and should be able to help you find the best fit...  

Very nice room. Don't think anyone could do better.

Paul, years ago I had a Krell Ref 2 preamp. The volume control started getting scratchy at about 6 years of age. A friend and I drove to NYC to the Hi Fi show there where I found Dan and asked him what to do about the volume control. His reply was the control was a custom unit and there are none left. The minimum order was something like 500 units so he had no plans to get more stock. He told me, "Go to RadioShack and get a pot. Just mount it on top of the preamp."  "Built to last a lifetime." My backside. I would replace that line with one that supports its customers and you better. 

"go to radioshack".  What the @$(@!    That sucks...  I learned over the years some of the best gear in the world doesn't always think or react like an "end user".     Just go buy another....why not ;)