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

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

@tweak1  If all the factors are the same and the difference is only the amp and the depth disappears, I don't understand how your comment applies.