Keep your LZA4s. Get a DAP or Smart Device which you can use either Neutron or Viper, and use their DSP algorithms to alter the sense of stage. The FiiO X5iii coming out now has Viper integrated and the ability to alter staging is impressive.
In my experience. you are not going to get speaker like sound from a sealed IEM.
@fraza44 and everyone - bought the X5III for a friend this past weekend and had a chance to have a listen (not as much as I would have liked, but didn't want to butt in too much, it's his first DAP!)
The improvement in sound quality and soundstaging (esp. depth) from the original X5 is quite remarkable. The actual difference (more detailed/better resolution, more three-dimensional staging) is relatively subtle but it adds up to a real step up from the original. What I mean is that the small difference they have made makes a big difference for the listener.
Wasn't able to effectively audition Viper, so can't comment on that. @fraza44 I am also in constant search of an out of the body stage experience. The X5III alone (tried with A4s and Nighthawks) won't take you all the way there, but it will get you closer.
I was really impressed - though for my money it still needs the Cayin C5 to sound its best (again, with the extra width and depth that amp provides)
Sorry for the off-topic - I wasn't going to say anything (even though I was bursting to tell someone about it!) but since it was mentioned, thought I'd jump in!
Replacement cable for the A4s still hasn't arrived - apparently there was a hold-up because I wanted an L-shaped connector which they had to order in. They really should have let me know this would cause a delay, because I would rather have the cable earlier with a standard connector. Ah well, first world problems!!!