...well, we seem to agree that corners can be sonic trash-cans, and a room may benefit from treating them. I use Primacoustic corner traps. They were one of the first treatments I added to the room, and they're still in place.
Re: the cubes, we could speculate on what they might do, since the manufacturer doesn't provide much (any?) detail.
They might reflect waves out of the corners to provide a helpful disturbance. Based on the total sq.ft. of the corner and the diminutive size of the cubes, this ratio doesn't seem like it would add much of a potential punch.
They are blocks with assymetrical holes drilled into the wood, as I understand it. So, some air/sound could enter the interior "chamber" of the cube and create an effect. I would think you would need pretty good velocity to create an effect...like those "deer whistlers" you can add to the front of your car. Not sure the efficacy of those things has been proven either, as reports by the deer population have been vague and inconclusive.
I wouldn't think the cubes would be a pressure-based solution, and corners are high pressure zones, aren't they...rather than high velocity zones?
The same manufacturer makes little bowls of different metals, They have little wings and you can rotate them to dial in the effect. Presumably, the asymmetrical holes in the cubes offer the same "tuning" options.
Based on these WBF exchanges and reading the, in my opinion, useless reviews, I decided to take Sweetie's singing bowl to the hifi room for sonic experimentation, lest I be forever categorized as a close-minded old fart. Although, the old part is true. And don't worry: Sweetie is away lecturing over-seas.
I placed the bowl on its pillow and located it on top of each speaker, the dac, the server, in front of the quad diffusors in back...and each time, I gave the bowl a whack with the padded mallot.
It makes a ringing tone, per usual, although on top of the speakers, it does get a slight pulsing effect. That would be the test closest to the ceiling, which perhaps could account for a reverb effect?
But it requires me giving it a whack; it did not audibly ring when placed in any of the locations. I did these tests with and without music playing.
I could not hear any effect with the music playing at normal volumes, in any location. Maybe I need more bowls and assistants to strike in unison?
What did I learn? About as much as reading those "reviews." If those little cubes are helping your room, @Cellcbern
that's good. I don't see how they could be, but there are many things I cannot explain. Think they generate any tone or vibration when in situ one could measure? Cheers...