I think that's a staple of the single ended rsa portables. Small soundstage. However the overall sound of Ray's portables outweighs the soundstage issue for most RSA fans.
Headfonia Mike actually prefers the single ended sound, but had to admit that if you prefer a wider soundstage, the sr71b was the way to go. Bass is stronger too. Sounds like a portable match made in hifi heaven for the lcd-2.
I love my sr-71a and plan to keep it for single ended use (sr71b apparently doesn't do single ended quite as well as the 71a according to Headfonia), but I'm pretty sure I'm going to add an sr-71b within the next few months. Or I may save up for the liquid fire desktop amp that the lcd-2 people are raving about. But that's another topic (and tax bracket) :)