Limited soundstage between speakers

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.

I dream of a dedicated audio room.

I dream of obtaining a 3D enhancer BAACH dsp crosstalk cancelling component. Reviews extremely positive