@Brooko  fantastic review! like you i prefer the treble filter during my time with the t20s, i'm still working on my review and comparison with the T10i. Again as you stated very clearly for me anyway i give the nod to the t20s. the t10is issues i don't think lies strictly in the bass. i feel its a bit "confused", theres a massive dip, along with that sort of metallic treble made me disappointed with an otherwise fine product! So glad RHA listened =) makes us more motivated to voice our opinions and give our feedback! 

I'd love to have the T10i back to measure it using the same system.  I'm guessing real issue will be mid-bass and lower mid-range.  The bleed on those was really bad.  The T20 on the other hand - pretty good IEM.

Good review.