Shakti Hallograph Sound Field Optimizer

I use them and find they do a wonderful job but yes they are pricey. I've told dozen of customers to go to Home Depot or Lowes and buy one of those rose trestle (3 or 4 fingers made of cheap wood) and make a wooden base and place one in each corner of the room. All these do is break up sound waves to smooth out your room response, yes the Shakti device looks like a piece of art but for $12 you can have the same benefit.

(Dealer disclaimer)

.... the sound of one pair of Hallograph is salubrious, exquisite, stunning, glorious and dazzling and the sound of another pair is superlative, smashing, magnificent, superb and impeccable...but it can be improved dramatically, when a Vibraplane is below them...so airy...this nailed "nothing" focussed in the soundstage must be heard to believe.

From what I understood from talking with the maker, speaker type can make a difference too. Boxed monopoles are OK. Dipole types, not so much...

I have a pair that I used in a sound treated room of atypical configuration with Avantgarde Trios. They made an audible improvement. I relocated them to a second home with a medium sized traditional rectangular shape and highly modified Klipsch Belles. This room was not sound treated. I could not hear a difference in the second room and system. All said from my experience, the improvements are highly variable and a function of the room and speakers.

I've now tried them in a sound treated room and did not hear a difference. My uneducated assessment is that they function as a front wall diffusor, so of limited impact in a treated room. Consider using the $ for a few sound panels, e.g., GIK bass traps, absorption panels, and QRD reflectors for the corners, 1st reflections points, and rear wall respectively. They will be the same price.