Solid state amplifiers and sound stage, especially front to back "depth"

Mahgister, helmholtz controls sound very interesting. Can you refer me to some threads where they’re mentioned so I can read up on them? All the best,

i never see someone who use a grid of Helmotlz resonators with tubes and pipes consisting of 2 or 3 sections with a volume and 2 necks of different diameter...i see boxes with cavities and holes which are also resonator specifically tuned for some frequency...

I created this reading an article about the first frontwave law and when arguing here with an "objectivist" about the importance of acoustic few months ago...

This article:

The relation between spatial impression and the law of the first wavefront - ScienceDirect

I can send it to you if you give me your adress...

And read that to an introduction:

https://newt.phys.unsw.edu.au/jw/Helmholtz.html

https://arxiv.org/ftp/arxiv/papers/1805/1805.04014.pdf


This is not simple but it will give you an idea why i used volume with double neck of different diameter

http://www.ica2016.org.ar/ica2016proceedings/ica2016/ICA2016-0491.pdf

I adjust all my grid by trials and errors and by ears but this will give you the "gist" of the matter:

http://hyperphysics.phy-astr.gsu.edu/hbase/Waves/cavity.html


There a plenty of materials to be inspired on the net just typing Helmholtz resonators...


The idea of the grid like i use it now around 40 tubes and pipes with orientable and adjustable neck or double neck is nowhere....i found nothing resembling my idea save "Argent lens room tuner"....

http://www.soundstagenetwork.com/noisy14.htm
But the argent lens room tuner inspire me BUT this cost thousand bucks and after my experiment i realize that i could do better a NO cost... I did....

The first article about the firstvrontwave law was the more IMPORTANT...

I realize that i must tailor the room for the speakers and not the speakers for the room (elkectronical equalization)

Then i realize that i could place some resonators near the bass driver of only one of my speakers and some other resonators near the tweeter of the pther speakers, it is the way i used to MARKING OUT for each ear each speaker with a different enhenced and damped frequency different for each speaker.... This made easier the recognition of direction of the sound in my room by the brain...

I placed many different resonators in 3 other locations after the speakers, near the lateral reflection area, and behind my listening position...

It take near 3 months of adjustment but it was fun....

It is complete now EVERYTHING sound natural.... It was trials and errors but it is way more easy to do then most people think....

Anyway the cost was near zero bucks....

And many albums now sound like if the orchestra fill the room....

I think that even if the gear is important, for average gear under 10,000 bucks, then orfinary gear, it is the acoustic which is very important way more than electrical noise floor control or vibration control...

for me passive material treatment (homemade) so good it is now was not enough.... The grid made my system a new one...

I will never upgrade because the cost will be arounf 15,000 bucks to kill my 500 bucks very satisfying system....

I feel no frustration now listening anything that is better than my system... They are better but i lag behind not too far for the price i paid. The ratio S.Q./price is the key....

If you need some information feel free to ask...

I am not an acoustician by the way but even if what i described seems complex mathematically, it is very easy to design if you are crafty.... I am not and it take me 1 hour to design my 6 first pipes....

You must use some aborbing stuff in the basis of the tube...if the tube is the volume for the neck i used straws if different diameter the smaller possible to a few millimeters...i Plugged smaller straw for example in finer one with tunable lenght by cut which made them easy to insert in one another.... I modified them on the spot with listening experiments...


Try 3 sets of 3 like the argent room lens but with tubes of diffent volume and size, it could be made not too horrible aesthetically.... If you are in a living room i am afraid that you will not be able to do that without divorce.... I am sorry....
😊
My best to you...

I just listened to Canadian Brass back album Goldberg Variation....


https://www.youtube.com/watch?v=mhHa8Pfw2E8


The sound is NOT between the speakers at all....

Completely filled my room coming from different directions and i feel surrounded by them....

Then for snratio and mijostyn claiming that it is impossible that the sound fill my room but must comes only from between the speakers it is like i said for sometimes now plainly false by simple acoustic law used in room treatment (timing reflection) and room control (marking out the 2 frontwaves coming from each speaker for each ear and tuning the room also for the specific speakers)....They call that "tricks" without knowing that all acoustic is mastering of " tricks" linked to general laws and phenomena known from millenia and mature with Helmholtz....Roman and Greek and Egyptian already used big amphora in room theater like i used my tubes and Helmholtz his bottles....



Then you can use this excellent recording and interpretation to guess where you are with your room control...

If your sound stay in between the speakers you are not there.... If you are immersed in the soundfield forgetting where are the speakers you are there.... Between these 3 extremes there will be levels of listener envelopment....from an imaging locked between the speakers to an imaging surrounding you....


When you have that like me for 500 bucks you dont think about an upgrade.... The sound will be better if i was upgrading my Sansui bor a Berning amplifier and my Mission speakers for i dont know what....But i can live happy with my 500 bucks system thanks to maturity design of my dac and vintage amplifier and speakers but thanks for the most part to acoustic control without which i know welll that the sound will be imaging BETWEEN the speakers not all over my room with me in them....I know because it was the same gear i used for the last 5 years before acoustic control, before vibrations control and before my relative control of the electrical noise floor....

I apologise for my long posts....

 thanks for your interest and   my deepest respect....

@mahgister Thank you so much for the links. The Science Direct one looks very good. I will look at the others. 

I am willing to experiment and also alter my room, perhaps not as much as you. So, I hope there is some kind of solution here that does not require as much effort or complication as it seems. I cannot look for a "needle in a haystack" but I can take time to make improvements if there is a clear process that is incrementally better.

Thanks for your interest...

It look complicated but it is not.... It is only fun....

And if i could do it, me who is not crafty at all, anybody can do it...

My best to you.... Enjoy your room one step at a time....

Most likely it is your dac, pre and cabling. See my comments in the "class D is it dry" thread