I do not say they are equal in results...
I only suggest that a room acoustic and devices dont need to be costly...
I know this why?
Because when i listen my 500 bucks system in my dedicated room i am sure that your system is superior to mine... I am not so stupid... 😁😊
My point is more subtle and difficult to admit for some but my system is not so far away from yours than what you think...I am in no way envious or frustrated...Acoustic is the key and it is my most important discovery in audio... 😁😊
If i can enjoy my system room way better than my 8 headphones now in my drawer for good this means something no?
And my point was not to say that my low cost Helmholtz diffusers are not so much behind your Hallograph than what you think , BECAUSE they work on the shear velocity of waves diffusion on some location and price tag and acoustic principle has nothing in common anyway. and price tag dont determine the results...
By the way i use no brand name costly "tweaks" i created most of my devices homemade and with a method... Some device give us something that nothing else will do...You cannot replace vibrations control under a speaker by replacing the speaker by a more costly one generally... For sure a 500,000 bucks speakers nay have vibrations controls included in his design...
Optimizing SMALL room acoustic is essential not a icing on a cake in most cases most of the time...
It is the relation between the system and the room who give us acoustical factor like "listener envelopment" and source width ratio LEV/ASW not the electronical design by itself alone...
And designing a room is more important than the price tag of the components..
The Hallographs are superior to toilet paper roll Helmholtz diffusers and probably any typical Helmholtz diffuser. I needed them in my prior home which did not have a custom built listening room.
If I purchase Von Schweikert speakers, I probably won’t need them at all. Same with speaker HFTs.
Perhaps yes the sound quality will be so good you feel that way and you will perceive it so...
But buying ready made "tweaks" is not FINE TUNING A ROOM...
A tweak is not an acoustic method by itself.... Learning how to tune a room supposed a method...It is not buy and plug here...
The relation speakers/room ask for an acoustical optimization process that bear no relation with the design or price tag of a specific speakers... All speakers enter in a relation to the room in their own way and each specific room help and/or impede some emerging acoustical cues... Optimizing this relation ask for a fine tuning of the room that cannot be solved by a general ready made product alone even by many...
I called my grid of Helmholtz resonators and Helmholtz diffusers a "mechanical equalizer" why?
Because it modify the room pressure zone distribution to adapt the room to the specs and properties of the speakers FOR YOUR EARS which are also specific...
A small room acoustic is not an amphiteater room acoustic... This is very different room for different use...
Acoustic room treatment and mechanical control are always necessary save in a completely designed room by an acoustician for some specific speakers...but here the cost is stratospheric...A good acoustician here can use Helmholtz resonators in the wall and diffusers at some spot to help the room in his service to the chosen speakers...
There exist no miraculous speakers at any price who sound the same in ALL room....treated and non treated, controlled or not controlled... this is a common place fact...
I apologize if i seem rude....
My deepest respect to you