RS1i has a forward (row A vs Row J) up-front upper midrange, especially on some vocal presentations, that could be described as "shrill". Some amps I've tried can make this worse, Woo WA6, properly tubed, backs it off a bit. Not at all shrill, yet retianing all the detail, texture and timbre that Grado lovers love.
System (synergy among all links in the chain) dependent and IMO, of course.
Pair it with a nice tube amp...mad or wa6 and you will be golden