Introduction This is my first ever IEM review be nice >.< I've been using the RHA MA750i as a daily portable IEM for over 3 years and is due for an upgrade. I bought this unit for myself intended for portable everyday use and drumming. After years of exploring my IEM tastes I *think* I've finally found it and the ER3XR seemed to offer what I want (portable, noise isolation, non-fatiguing sound sig). The ER3XR were rumored to be 90% of the ER4XR with significant reduction in price made it a no brainer to replace my portable IEM. Disclaimer & About...

Disclaimer: The following review are my impressions, and may not be what you experience. My ears are wierd. In addition, the Burson V5 OP-amp is provided for free by Charles from SS-audio (Burson Audio) in exchange for an honest review. My original setup was simple: Laptop -> FiiO Q1 -> HD598. After a while, I really wanted to try out how tube sounds like. Unfortunetly, without a big budget, I settled for a hybrid tube amp - the Little Dot 1+. It suited the bill very well: Lower impedence headphones such as the HD598 works well without much noise...