FIFTH UPDATE:
THE HELMHOLTZ MECHANICAL EQUALIZER or H.M.E.
The H.M.E. is a snake whose body is an array of 30 tubes and pipes now.... I added a last one made of cardboard paper toilet rolls 😁 21 inches high with a 12 inches neck with a diameter of the mouth of the neck 1/3 of a straw diameter, and put it on top of the damping load which are on my speaker.... I added this one to my right speaker only, the TAIL of the snake...I move the long very thin neck made of 2 straw parts in the direction of the corner where the speaker is recessed in the wall corner.... Result: better dynamic and improvement in the balance between LEV and ASW... This last tube is near another one on this speaker with their 2 necks at 90 degree of one another....
The " tail speaker" is activated with 3 tubes near the bass driver.... The " head speaker" is activated by 2 thin tubes near the tweeter.... This difference separate the 2 direct wavefronts coming from each speaker, these 2 wavefronts reflect on the walls of my room early and lately, but differently for each ear, this difference help the brain to recreate spatial cues of three dimensionality and also the right balance between the listener envelopment factor LEV. and the relative source width ASW. The timing between late and early reflections and the reflections coming from behind my head are crux of the matter in creating this balance but also the distinctive voice of the 2 direct frontwaves coming from the speakers...This distinction between the head and tail speakers is the secret of my H.M. E.
The long neck of my tubes and pipes can be turned around 360 degree angle than sometimes it is useful experimenting with the change of pressure in the right zone of the room....
The effect is audible like usual in my 2 listening position....
What a journey! How fun it was! and at no cost.....
Someone asked me if i think that my system is better than some costly one.... For sure not, theoretically, practically it is very relative to the room where the good system are working.... But trust me i trail the best system and i am behind for sure, with my 500 bucks system, how could it be otherwise anyway? BUT NOT far , far behind, nearer than i never think possible in my wildest dream....And when the music is there in the room no one think about a costly upgrade anymore....
I will love that someone with a very costly system would listen to my 500 bucks system....The surprize would not be for me....For sure my system will be probably less performative but not so far behind for peanuts costs... 😎
That was the point i wanted to made: "audiophile experience which is not poor at all for the poors"....