The GR07 MKII has better soundstage depth than the MKI, IMO.. but the (original) SB has an even more airy, open soundstage. The SB is warmer than the GR07, too (so you're getting a slightly different signature, as well). IMO.. yes, it's worth having the SB around just for the soundstage.
Edited by FlySweep - 12/20/12 at 3:09pm


















