Limited soundstage between speakers

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?

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

Yes, like in a concert hall. Too many audiophiles have over damped rooms.

@mglik 

How did you diagnose the problem and decide to use a Zobel network? I've seen the Deulund-Mundorf Speaker Purifiers for sale.