I went to Best Buy and looked at the Beam Ultra to measure the mounting points. It’s a very oddball 32.3 centimeters or about 12-7/8 inches from center-to-center. The Arc Ultra is a nice, evenly measured 24 inches. Since the two were both on display, along with a Beam 2, I took a listen.
Although there was no ceiling (probably 30 feel high) the difference between the Beam 2 and Beam Ultra didn’t seem all that impressive. However, the Arc Ultra was considerably more distinct. Better bass and much better speech clarity!
As a result, I went home to rethink and this morning decided the Arc Ultra seems worth it. It’s $200 more than the Beam Ultra and Costco is offering a bundle for $13 more than than the $899 it costs everywhere else. For that the bundle includes a $60 Apple Gift Card (which I can definitely use) and a $79 wall Sonos mount voucher plus 30% off Sonos accessories coupon. Then Costco is giving me another $10 off and free same day delivery!
I pulled the trigger on that and expect my Arc in about an hour or so. After checking out the Sonos wall mount it seems like it will be easy to attach it to my current under-TV mount. At most I’ll need to add a couple spacers when I bolt it on. Depending on how quickly I get the wall mount and attach it under the TV, I’ll report back on how that went.