The Law of Accelerating Returns


I totally agree this letter from the editor of A-S.

It makes sense if you have a $10,000 high quality integrated and stick a   $500.00 TT with a $300 phono section, a $400,00 Topping DAC and stream through your phone you will never know the real potential of the $10K integrated. And don't get me going on speakers. 

This article makes total sense but one must live within their means. 

No you do not have to spend a left lung for great sound but it all needs to be balanced. 

 

128x128jerryg123

@helmholtzsoul I clerified the simplified short version. We are on the same page.

It is not the "ONLY" way to tune a room completely.

Is it not better to NOT push power into frequencies that the room gets excited about because its dimensions and positions of speakers and sweet spot? Of course it is.

 

The Helmholtz for example is a fix on something that is after that we have created the issue.

But it so a good treatment technology to have in the toolbox.

The bottom line is who care about money of components or synergy of the level of the same, if the room is untreated.

 

It is funny to see the focus on price, the results is audiophiles bringing whole their life gear in and out of the same poor room. And expecting a better results.. ..but they just get different results.

 Talking about "sideways" moves. 

First this room "from Hell" is my laboratory, or dedicated room not a living room...
Then keep any sarcasm for yourself, people use them when they have no arguments and you seem articulate... 😁😊The photos in my virtual page has nothing to do with my actual room the images were taken before i iuse the Helmholtz method...


"Helmholtz treatment "only" work on ONE frequency and to bring down a peak in that very specific frequency and nothing more or less. Change the volume of the air cavity, or the length or diameter of the neck, and you change the frequency of resonance."

First Mechanical resonators are not DSP at all...Your comparison with DSP is flawed...
Why?

Because Helmholtz resonators (H.R.) absorb a larger bandwith and not a singular frequency...
And they DIFFUSE also other frequencies which are not absorbed...And they work in relation with the room geometry and size, and their placement is critical...Mine are mostly tubes with neck of various dimensions , some fabric cloth act as an absorbing material at the base of the tube end... They are made of different materials...

«Such a Helmholtz resonator has some very
interesting characteristics. For instance, sound is absorbed at the frequency of resonance and at nearby frequencies. The width of this absorption band depends on the friction of the system. A glass jug
offers little friction to the vibrating air and would have a very narrow
absorption band. Adding a bit of gauze across the mouth of the jug or
stuffing a wisp of cotton into the neck, the amplitude of vibration is
reduced and the width of the absorption band is increased.The sound impinging on a Helmholtz resonator that is not absorbed is reradiated. As the sound is reradiated from the resonator opening, it
tends to be radiated in a hemisphere. This means that unabsorbed
energy is diffused, and diffusion of sound is a very desirable thing in a
studio or listening room.»

The Master Handbook of Acoustics Fourth Edition by F. Alton Everest P.215

 

Also all my H.R. are of different size, not one is the same in neck, lenght, volume or perimeter....For exemple one is 8 feet in my 8feet high1/2 inches in my studio, they ALL Differ by some ratio...
Then your comparison with DSP correction which use a one test frequency is flawed.,..A DSP dont absorb some bandwidth and dont diffuse some otrher bandwidth in some ratio at the same time...A DSP enhance some PRECISE test singular frequency...

Also i had a set of specialized Helmholtz diffusers or H.D. , which are way less known devices, this H.D. are OPEN TUBES OR PIPES, all of different lenghts and perimeter , then differering in volume, with a FILTERING GAZE or cloth fabric of different densities then of different absorptions properties... One mouth is open the other FILTERED by this gaze of various fabric densities or by a set a set of various thinner STRAWS of different size.... This created a powerful diffusion in critical placement....In particular near listening position and on the speaker themselves at precise location DIFFERENT for each one speaker by the way... Guess why? 😁😊

Location is KEY.... Like i said in my previous post i use the Haas law of the first wavefronts to tune my sound for EACH ear from EACH speaker.... My speaker are modified by H.D. placement around them or on them in an asymmetrical way to increase some acoustic crossfeed of large bandwidth...I even use a double two section foldable screen behind me to increase the acoustic crossfeed by the speaker A on the  phantom image of B and speaker A on the phantom  image of A for each one of my ears...

All the tuning was made on few months period daily, it was fun and very enlightening ...The work was exactly like a piano tuning but here it is a MUTUAL speakers/room tuning.... The H.D. and H.R. devices  circle the room from the "HEAD" speker to the "TAIL" speaker with the "BELLY" of this acoustical SERPENT being  my listening location chair with the  FOCUSING lenses of the   reflected waves  of this foldable screen behind my head...
Time and timing of reflected and direct waves are the KEY...Reverberation control is key...

«A sound field in a room is composed of direct sound and reverberation. The interaural correlation follows the sinc function corresponding to the subjective diffuseness
in a room, as the distance increases from the source, when the sound source radiates random noise. However, for speech signals a listener is able to localize the
sound source even in the reverberant space. Early reflections within around 30 (ms)
of the direct sound enhance the energy of the direct sound. This positive enhancement due to early reflections can be explained by the Haas effect or the precedence
effect [18][44][45][46] in terms of the binaural sound localization.» Acoustic Signals and hearing Mikio Tohyama P.202

 

 

All my 8 headphones are in a closet now... Why ?
Because my room/speakers give me an intimacy, a dynamic, a soundscape, an imaging SUPERIOR to each one of them... I cannot go back to headphones...

When you correct the room with electronical tool unlike my mechanical devices which are part of the room, you cannot tune the room for TWO Listening locations like mechanical room tuning, and the tuning location with a microphone feed back and test frequency are valuable ONLY for a "sweet spot" which measure around one millimeter you bend the head and all ,easures are amok... In my room the sweespot are larger in nearfield listening (three feet) or my regular position (8 feet).... The regular position is more like regular speaker listening, the nearfield is nore headphone like , BUT in the two positions, acording to the recording album, the soundscape CIRCLE me almost and the listener is not in front of the music sometimes, but in the center with instruments sometimes around me...it is relative to EACH RECORDING effect... I can hears the acoustic bubble specific to each recording choices by the studio engineer...

Then before moching the lack of esthtic of my room, and his alleged efficiency think TWICE....
"Just imagine to take 100 books and place them on the floor, and scattered around on the floor around the sweet spot, and a book is far smaller than a Helmholtz resonator.. i can not imagine that mess.."

 

Your description has nothing to do with my H. grid location RESONATORS AND DIFFUSERS size and precise working location function for psycho-acoustic effect and not only physical acoustic effect , these two devices are not the same thing also...

 

---First, Helmholtz devices of any type are not mere  TOOLS...

You dont let tools scattered across a room after their use time... 😁😊

H.R. And H. D. are PART of the room, they modify definitively  the pressures zones distribution of the room by staying in place ...

A DSP tool and a microphone dont do that and after their job is done you remove them from the room...

 

--- Second , your warning about the modification of the sweet pot reveal you dont undertstand the way this grid work at all...The devices are there to mutually adapt the speakers and the room to one another...My sweetspot extended to a large part of the listener location than your mic/dsp method who has no value passed one millimeter or so....

I place some H.D. near the speaker bass driver or tweeter asymmetrically to help each ears to create the localization effect... I will not go into details ...

 

Is it not better to NOT push power into frequencies that the room gets excited about because its dimensions and positions of speakers and sweet spot? Of course it is.

 

The Helmholtz for example is a fix on something that is after that we have created the issue.

But it so a good treatment technology to have in the toolbox.

 

"It is not the "ONLY" way to tune a room completely"

First Helmholtz resonators and Helmholtz diffusers like said rightfully @helmholtzsoul are the main and ONLY mechanical way to modify a room and tune it and also tune each speaker for each ear by the way ...

The greeks and Egyptians and Chinese and Helmlhotz the father of modern acoustic and of psycho-acoustic thought so...

«In Helmholtz resonators, we have acoustical artifacts that far antedate Helmholtz himself. Resonators in the form of large pots were used in ancient times by the Greeks and Romans in their open-air
theaters. Apparently they were used to provide some reverberation
in this nonreverberant outdoor setting. Some of the larger pots that
have survived to modern times have reverberation times of from 0.5
to 2 seconds. These would also absorb sound at the lower frequencies. Groupings of smaller pots supplied sound absorption at the higher frequencies.»
The Master Handbook of Acoustics Fourth Edition by F. Alton Everest P.216

Second, the fact that you use DSP confuse your mind...

«Is it not better to NOT push power into frequencies that the room gets excited about because its dimensions and positions of speakers and sweet spot? Of course it is.»

DSP modify the speaker response only , the H.R. and H. D. modify the speakers and room relation by modifying each of them at the same time for psycho-acoustic effect for EACH ear from EACH speaker.... DSP AND MIC. are not an integral part of the room like H.R. or H. D. are in their working way....They are used to modify the source information to your taste and adjust in ONE chosen way the speakers response to the room...They dont modify the room response at the same time for the speaker sorry...

My sweet spot is not IMPEDED at all by the mechanical tuning devices in the contrary, my sweet spot is created by them and not only by the precise location of my chair in a short one millimeter range but for a larger range ... Then i had a better sweetspot because he is effective in a larger dimension than one millimeter range and dont lost all his effective action after that ...

And try to adress the Schroeder frequency and bass limitations with DSP... Good luck....Room passive treatment +DSP will not do it....It takes a mechanical control of the room whose pressure zones modification are possible with Helmholtz mechanical devices to reach a better dynamic, and a better bass clarity in small room......

 

😁😊