i havent heard the s4 but id guess it has more bass quantity/impact.. but i'd also guess that the re0 is superior in every other way(sonically)
if you look at it this way, the s4 is an $80 earphone w/ average reviews... the re0 was originally a $169 earphone which was highly praised on head-fi, but now that it's been on sale for $99 - you'd be hard pressed to find anyone say it's not worth it
but if you factor in build quality/comfort/durability, then it's a bit more even imo
if you look at it this way, the s4 is an $80 earphone w/ average reviews... the re0 was originally a $169 earphone which was highly praised on head-fi, but now that it's been on sale for $99 - you'd be hard pressed to find anyone say it's not worth it
but if you factor in build quality/comfort/durability, then it's a bit more even imo