I think the pair I have have filters inside; I can see mesh-like wiring when I look into the canal. I cannot see any evident residue that is clogging it up, unless debris actually went through the filter.   Thanks for your responses squallkiercosa!

  Yes, it seems definitive that it is a driver problem.   One more question might I add, does anybody know of the common causes of driver failure so that I could prevent this from happening in the foreseeable future?

  I was just hoping my deductions were not precise enough to conclude that my right earbud was faulty. Otherwise, I'll just purchase a new cable and be a new happy man again, although this does not seem like the case.   You mentioned that the shell seems to be "openable", and now that I think...

    No, that's the thing, my warranty is out.   Are BA issues a common thing...? I thought I was going to be fine with the replaceable cables for a good long time...

Any help please?

Hi,   I've owned the UM2RC for a month and they really are a step up from my previous set of earphones.   Recently, however, the right side seems to have less volume than the left. There is also a noticeable "cracking" sound when I increase the volume, especially prevalent on tracks with...