Limited soundstage between speakers

Treat your room.

Yes but treating a room with passive absorbing or rflective surfaces or difusive one,  is not the same thing  as  controlling the room mechanically...

Thats the point of my posts...

passive treatment is necessary and also some mechanical control with Helmholtz resonators and diffusers...

I had serious issues with my soundstage and imaging.

But it appears to be caused by hash or noise in my high treble.

These issues were solved by the addition of what are known as Zobel networks plugged into the binding posts of my speakers. In my case, those are the treble ones of the two pair. There is a fellow on AG who has built these: Deulund-Mundorf Speaker Purifiers. I think these can be built using those caps and resistors with a heat sink. Although the component values are custom made for the Ohm rating of your speakers. They do not interfere with the built in speaker crossovers since they only effect HF 12K Hz and above. 
I had thought that my speaker placement or room were to blame. Not the case!

Now after about 150 hours of break in for the caps, imaging is pinpoint and the soundstage is wide and deep. I guess it’s like getting a pair of highly upgraded tweeters. It is clear that the former HFs were “dirty”.  To “purify” is the key.

To “purify” is the key.

There exist three embeddings dimensions to control: electricial one is only one...

Vibrations/resonance negative effect of the gear is hugely underestimated too...

Vibrations mechanical control is a key...I know you know it well using springs like me...it is a transformative move to control vibrations...

But acoustic is the last and more important key and more complex to get it right than the other 2....And hugely more impactful for all acoustic cues...

But no embedings control alone , be it mechanical, electrical or acoustical can replace the other 2...None.... Acoustic control cannot decrease the negative effect of the speakers vibrations for example ...

Then there exist three keys...

But trust me acoustic is the more impactful for sound perception ....

My best to you....

Treat your room.

Suppress early reflections more, or find a way to enhance them?

Reflections must not be suppressed completely OR enhanced over absorption ...

They must be USED in some RATIO and some TIMING....balance between reflections, absortion and diffusion in a specfic room is the key....

Lateral reflections and back reflections especially...

Why my soundscape is so good otherwise?

My dac brand name alleged quality?

No....

My speakers brand name alleged design ?

No....

My amplifier brand name miraculous power?

No ....

Basic acoustic and psycho-acoustic knowledge and experiments...Yes....

😁😊

Suppress early reflections more, or find a way to enhance them?