A quick review-ish thing. I've been working on a review for months, but I'm terribly behind on so many reviews right now. Maybe I'll get to it by spring.
Anyhow, I find the Jr. overall warmish, although the subbass isn't strong. I would say a soft treble is what makes the Jr sound warmish, not boosted bass. I sometimes wish the sub-bass performance was better. In fact, it doesn't bring out Z5's full bass capabilities, so I hesitate using the Jr. with the Z5. On the other hand, for slightly colder IEMs, like 6R or UERM, I like the Jr. Overall, there is nothing wrong with Jr.'s signature. It's a safe kind of signature, although there is nothing impressive about it either. It's solid. And considering it's size, I'm quite impressed with the power.