Just had a 5-min A/B mini session between the ER4S and FI-BA-SS—only 5 mins because I seriously dislike A/B'ing phones. TBH, before this extremely short session, I was prepared to declare the 4S 'the winner' by a very small margin, but, in all honesty, I just couldn't. The 4S & the SS are different yet still rather similar, both stellar phones (both single-BA phones).
The FI-BA-SS is an absolutely terrific phone (have had it for over a year now), and its much cheaper sibling, the FI-BA-SB, aka Heaven S (now discontinued), delivers a good 90% of the SS's sonics (perhaps close to 95% even). Will eventually A/B the SB and the 4S. It was the SB that very soon made me get the SS—the SB impressed me so much that I had to admit to myself that I preferred it over the excellent EX1000 (though I'm sure more than a handful of people would not, but sparrows of the grumpy kind, as everyone should know by now, tend to be right).
Would obviously need a longer, more focused A/B session to determine which phone I'd prefer (as if I really cared), but suffice to say the ER4S, FI-BA-SB & FI-BA-SS are phenomenal phones.
Edited by music_4321 - 9/10/13 at 10:36am