Which speakers have the biggest soundstage

Omega Super 6 XRS Alnico or the Super 8 XRS Alnico. I had a pair of the XRS 8's for a year and loved the sound stage they threw. Room placement is very easy for the XRS line, and they sound great!!! I unfortunatly had to sell my XRS 8's due to the bad economy. Call Louis he is a great guy and his speakers come with a 30 day return policy.
(203) 847-2800
Rodge

I agree with the Philojet, Audio Note speakers are wide disperson designs and are noted for their wide soundstage.

Due to their design, Ohm Walsh speakers provide a very wide soundstage due to unique design. If they are placed properly there is essentially no sweet spot in the room; you can move about and enjoy the music.

As stated above, dipoles can also provide a very wide soundstage but are more tricky and/or problematic to position properly for the best sound.

3d demension only?

easy...planars....and specifically:

Id put Magnapan at the top of the list. You will be looking for rear speakers there so good at it.

MAGICO MINI 2 with STEALTH V10 speaker cable.

One point to note that in addition to room size, the placement of the speakers in the room is another big factor that impacts soundstage. Most good speakers are capable of big soundstage I have found IF matched to the room and set up well.

What varies more from speaker to speaker I find is how well or how realistically the speaker places things within that soundstage. BEtter speakers are able to do this better in general. Also, a larger soundstage makes it easier for the listener's ears to triangulate and determine differences in location of the musical elements that occur within the soundstage and together form the music and also to detect subtle nuances captured in the recording.

A large well defined soundstage with good imaging is like watching an HD movie on large format TV and provides the best playing field availble in the home for having a shot at reproducing and our ears detecting everything the recording has to offer.