Is a good soundstage possible with 2 speakers only

Read the Wiki article. It's much shorter.

That Wiki article was good, and it's obvious by the references and the end, that there have been MANY MORE than just, "the Brain at TacTquot;&(Boz) that have been studying Ambiophonics. Actually it's study, together with other Psychoacoustic phenomena, has been continuing for over a century. Only now, through the powers availed by DSP, can more be done about what is lacking in the reproduction of recorded events. I suppose ignorance(or blindness) can be bliss, but(personally)- I'm now using a TacT Room Correction System(RCS 2.2X- MUCH more than simply equalization), and have found it indispensable, given the miserable acoustic in which my system now resides. I've no doubt whatever processor Boz has developed to deliver more of the original venue that exists in a recording; MUCH research and thought has gone into the design and functionality. This from a former strict, anti-digital, Straight-Wire-With-Gain adherent.

In my system and with my ears, 2 channel is often better than multichannel. MC requires the same quality source amps and speakers. Most 2 channel is not ideally positioned if it also suits MC. It will also require pro level EQ. Good luck.

The acoustic and psychoacoustic principles behind Ambiophonics are perfectly valid. Back in college I did some experimenting along similar lines, and even invented a passive inter-aural crosstalk cancellation system, but it was wildly impractical to say the least.

I don't doubt the claims made for very dramatic improvements in imaging, but if I understand correctly the downside is that your ears have to be in the right location for it to work - probably moreso than even the most sweet-spot-critical stereo setups. Thus I think an Ambiophonic setup would fit some people's listening style, but not others'.

Duke
dealer/manufacturer/inventor of the passive inter-aural crosstalk cancellator, circa 1984.

Why not try the free player?

I have some extra speakers to try it with (don't particularly feel like moving my main speakers). Would be even cooler if there was a Squeezebox plugin.