Which speakers have the biggest soundstage

IME, a speaker's dispersion pattern and cabinet design seem to dictate the character of the soundstage more than any other factors. Certainly not 100% of the story, but a BIG part of it. Mini monitors and planars both have their particular staging strengths, but IMHO, omnis tend to produce the biggest picture of all.

Marty

Larger loudspeakers can produce a large sound-stage.

My soundlab m2's and dunlavy sc3's produced a large realistic soundstage for my listening room.

The new Magnepan 1.7s. They will play louder than you think with 40-50 watts of good power.

In my experience, most dipole speakers do an excellent job with soundstage. I've heard great examples with planar, electostatic and open baffle designs. This is a fundamental strength of most boxless designs. On the flip side these type of speakers (in general) have a harder time with bass and microdynamics. There is no perfect speaker. Pick your sound priority and find the speaker design that optimizes accordingly.