Speakers The single most critical component

" I have not calculate the exact size where controls of the timing early and late reflections will be more difficult"

what do you mean?
Do you have early reflection panels (absorption) ? Cause one thing that is very clear in the acoustic world, any small room need at the minimum absorption at every early reflection points. DSP or EQ will not remove the decay problems caused by early reflections. Only absorption (in a small room) will. You could make your room measure flat FR wise with EQ and DSP, but without absorption at the early reflections points (ceiling, side walls and behind your listening position) any ECT measurements will clearly show that your room decay is not even at all frequencies and certainly not -15db within 20ms or even 100ms

"acoustic is the sleeping princess and the future queen, the gear is the 7 working dwarves’’
Agreed 100%

what do you mean?

The golden rule in PASSIVE treatment is simple: BALANCING the relation between absorbing and reflecting and diffusive surface...We need the three in some ratio according to each room specificities...

I did it by listening experiments...

For the first reflection point all is relative to other factors in the room: geometry, topology, size, acoustic content of furniture, walls, ceilings floors etc.

Then NO RULE is valid for ALL room save a balance that must be created by the tuning experiments by our own ears...

For the reflections point coming from front and back meditate this short abstract of a scientific paper:

«A new physical measure for psychologicalevaluation of a soundfield: Front/back energy ratio as a measurefor
envelopment.M. Morimoto (Environmental Acoust.Lab.,Facultyof Eng.,KobeUniv., Rokko,Nada,Kobe,657Japan)and
K. Iida (Kobe Univ., Kobe,657 Japan andMatsushita Commun.IndustrialCo., Ltd., Japan)
Broadening is one of the important characteristics for the psychological evaluation of a soundfield.Several investigations
indicated that broadening was comprised of two elemental senses, i.e.,auditory source width(spaciousness) and envelopment [M.
Morimoto et al., Proc. 13th ICA, Belgrade2, 215-218 (1989); J. AcoustSoc.Jpn.46, 449-457 (1990); and Hidaka et al., J.
Acoust.Soc.Am. 92, 2469 (A) (1992)]. They inferred that the degree of interaural cross correlation of late reflections correlated
with envelopment. This paper,however, shows the results of psychological experiments that envelopment is affected by theenergy
ratio of reflections coming from the front of the listener to those coming from the back of the listener,even if the degree of
interaural cross correlation of the late reflections are equal.Namely,envelopment grows as the energy of the reflection coming
from the back of the listener increases. This result suggests the need to measure the ratio which has never been measured.»


This is only an example of one of the paper that inspire me...

The ACTIVE mechanical controls of the room has 2 aspects: control of "timing" of early and late reflections complementing the passive treatment but control of the relation between each speaker direct wave with the location of different resonators near the speakers and around the room, this use of each speaker will make easier for each ear the recreation of distance then of "imaging"....It is possible to modify the timbre perception and the listener envelopment at will...The goal is the more natural is the best....

I am not a scientist only someone who listen by experiments....But i discover my idea reading some papers in psychoacoustic research...

I am totally convinced that people throw their money because they dont know how to control vibrations/resonance, and decresing the electrical noise floor and controls the acoustic at low cost...

All audio thread are about the gear electronical design , never mainly about how to install it rightfully... And the irony is that all in all electronic design is mature for decades now... It is not difficult to afford a relatively good pieces of gear now...

Then people throw themselves in an upgrading chase ignoring simple fact hypnotized by the weight of money which is for most the only way to reach a very good S.Q.

It is false...

If not, am i deaf?

With my 500 bucks system...

Perhaps....
who knows ? 😁

Nobody with a costly system will accept what i said easily .... but i never pretended that my systen rival costly one i only said that the ratio price/S.Q. of my system is very high.... And enough for me....

I spoke for those who dont have money to create sonic heaven... It is possible....

Ok i spoke too much...I hope it will help and made people think....

My best to all.....

First, I agree 100% with you about the importance of acoustics. its a crucial aspect of sound quality. Id go as far as say that I dont think you can get hi-fi sound without a properly treated room.

" For the reflections point coming from front and back meditate this short abstract of a scientific paper"

early reflections coming from the front wall? physically impossible, reflections coming from behind the speakers are secondary reflections and will affect the SBIR, but apart from open baffle or Maggies, no early reflections are coming off from the wall behind the speakers.
secondary reflections are good by definition. early reflections are always bad. no matter the room. do you know the definition of a early reflection and the difference between early and secondary reflections?



" For the first reflection point all is relative to other factors in the room: geometry, topology, size, acoustic content of furniture, walls, ceilings floors etc. Then NO RULE is valid for ALL room save a balance that must be created by the tuning experiments by our own ears..."

ok, so no mics or measurements?

The understanding of early reflections and how to make a small-medium room transparent acoustically is well established by now. Acoustic is a science. Not much mysteries left there. every room is different, but every room will have early reflections points. and the same method to stop the detriments from early reflections is either diffusion if you have a huge room, or in any normal room, absorption. "furniture" wont change anything here. Rugs either.



" control of "timing" of early and late reflections complementing the passive treatment but control of the relation between each speaker direct wave with the location of different resonators near the speakers and around the room, this use of each speaker will make easier for each ear the recreation of distance then of "imaging"

wow, not sure i understand this sentence. Resonators tackle specific FR bands. every room will need wideband absorption at early reflection points.


Acoustics is relatively simple

1- find the best listening position. good guideline is start at the 38% rule.
2- Find the best speaker position. Place a mic at the Listneing position and move the right speaker around until you have the smoothest bass without major peaks, avoiding the most crude bass modes. repeat with the Left speaker.
3- absorb the early reflections ( ceiling, side walls, floor, behind the listening position)
4- add 20 inch bass traps floor to ceiling in every corner of the room

Everyone following these steps will have a good measuring room (FR and decay wise)

I dont want to argue but like i said EACH room is different...

And what is important save the optimal ratio between reflection and absorbtion and diffusion related to EACH specific room is the TIMING THRESHOLDS Optimization...

Then i use contrary to general rule some reflection at early reflection points this is NOT AN ADVICE i give to all.... This is MY SITUATION in my room....
General rule in audio thread are only that general rule, i prefer my listening experiments and optimization for my room and for my ears and scientific research to help me....😁

Read that to have some idea of what i speak about:

«An essential point is that an auditory temporal window
does not have a rectangular shape, but it has a slope at each
end. Therefore, the conventional rectangular division of
reflections into an early and late part in time is overly simplistic. As suggested by the definitions of ASW and LEV
mentioned before, the perception of them relates strongly
to the law of the first wavefront [17]. Namely, as Bradley
and Soulodre describe in their paper [4], sound arriving
shortly after the direct sound is integrated or temporally
and spatially fused with the direct sound. Thus, increasing
levels of early lateral reflections increase the apparent level
of the direct sound and cause a slight ambiguity in its perceived location. These two effects contribute to the resulting increase in ASW. Later arriving sound is not
integrated or temporally and spatially fused with the direct
sound, and leads to more spatially distributed effects that
appear to envelop the listener. This description well
explains the relation between the perception of spatial
impression and the law. However, it is insufficient for a
deep understanding of the relation, because it is qualitative
but not quantitative.
Here, to facilitate understanding of the relation, let us
suppose a simple sound field consisted of a direct sound
and a single lateral reflection of constant level. According
to the law, when the delay time of the reflection does not
exceed a critical value, which depends on the kind of source
signal, only one sound image is perceived in the direction of
the direct sound. Then, ASW is perceived, but LEV is not
as explained above. That is, the reflection contributes only
to ASW. On the other hand, when the delay time exceeds
the critical value, two sound images are perceived separately in the directions of the direct sound and the reflection [18]. This phenomenon is called ‘‘image-splitting.’’
Then, LEV is perceived as explained above. Furthermore,
only LEV is perceived, based on the conventional physical
measures which divide reflections into an early and late
part. However, some questions arise from this case. Should
not ASW also be perceived simultaneously? If ASW is also
perceived, how much does the reflection contribute to create each of ASW and LEV? »


https://www.researchgate.net/publication/223804282_The_relation_between_spatial_impression_and_the_law_of_the_first_wavefront