I currently use a PlayBar inside a Just-Racks 1654 cabinet/entertainment center, that has a cloth front and special sound bar mount so it passes through PlayBar audio just fine. For pictures of the cabinet, check this site. I’m considering replacing the PlayBar with the Arc but would like to put it inside the cabinet.
The soundbar mount is height adjustable, so the sound bar can get 10+ cm space on the top, but obviously the cabinet will still block some of the sound that’s going up vertically compared to when it’s on top of the cabinet. And there are sides that potentially block part of the left and right firing speakers, they’re approx 25 cm from the Arc’s sides.
According to Spectral (Just-Racks parent company) the Arc works well and they’ve tested it with the Arc with good results, but I’d like to get a second opinion, hope that somebody here has experimented with putting the Arc inside a cabinet vs on top of it, and compare the difference.