Lieven posted a review of the newish ER4-XR and SR IEM over on Headfonia.  They have a bit of a bass boost from the original ER4-S.  Read the review of the for your by clicking the link below.  Personally, I’m sticking with my 2003 ER4-S and if I need more bass I’ll EQ it.   Interestingly, the original S and P models are going for about the same price as the XR and ST models.

Review of new ER4

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