Very great choices it seems to me...Thanks for youre interesting post...
I will only add for those who dont have money to do that like me, that it is possible for someone without money to do the same thing, or nearly approximate it, inspired by all this precise tweaks you just described...
Happily for sure, because we dont have all the luxury of this excess money......
34 SR HFT amount to near 2000 bucks...
2 pair of hallographs: 3000 bucks...
Add to that all others costly devices you described...And guess what is the cost?
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I dont doubt that these "tweaks" work at all...I know they work...
But it is possible to create a room with peanuts costs...
For example what the hallograph "form" teach us?
It teach us that modifying the shear velocity of waves on some pressure zone location we will enjoy a more "atmospherical" diffusion... This is TRUE...I created my own diffusers with Helmholtz method...
Then there exist simple means to do this at NO cost... Less esthetical though... 😊😊
It is the same thing for all other "tweaks" or "embeddings controls" which is the term i prefer to use or which i prefer to call them, to let in their sleep slumber the "snake oil" hunters or tool obsessed measuring groups...
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For a dedicated room, rejoice all "poor" audiophiles, i buld one at NO cost...Oufff 160,000 bucks... It work because if my sound is not the best there is in the world, i enjoy a sound quality with a 500 bucks system over the roof....
Read about acoustic and psycho-acoustic not about price tag brand name tweaks... But forget esthetic save if you are very crafty ....
For sure my post is adressed to the desesperate hopeless poor audiophiles....
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One thing is very important: the only luxury in audio is a dedicated room to conduct listening experiments and where tu put your devices, not the price tag of the system and the price tag of the "tweaks"...
An Helmholtz diffuser can be made with empty toilet paper rolls... 😁😊
Here is what I use: Two pairs of Hallographs to focus and gain ambiance with my typical box type dynamic speakers, 34 SR HFTs throughout the room and on speakers which adjust tonal balance and also disperse early reflections, boxed mounted and hanging Acoustic Fields foam absorption panels, SR blue outlet duplexes and three blue fuses on multiple amps, various types of footers, SR Mig Sx under one stereo amp, Stillpoints and one set of old Aurios under equipment with a Townshend seismic sink under a VPI TNT 6.
Stands and cabling are considered tweeks by some. The biggest tweek was building a custom high end audio listening room for $160,000.