A few people early on commented the E2s sounded muffled in the midrange, which should not be the case. The headphone should have full, powerful bass and warm but detailed and lifelike vocals. We investigated and found an anomaly our tests didn't pick up that could result in inadequate upper-midrange to lower treble output after burn-in is complete. We have re-designed our test fixtures and processes and this issue will not get past us again.
We identified around 12 units we suspect are impacted (we got one back and it was OK while another had a confirmed issue) and we're directly contacting affected owners or shops that sold them to check up on them and service if needed. Just to be cautious I wanted to post a note here in case anyone had an issue we couldn't predict from our review of production tests. If you feel your headphone's midrange is muffled and flat contact
info@mrspeakers.com and be sure to include your serial number so we can check the data.
If you haven't heard from us and don't feel your midrange is muffled your headphone is fine, this issue has a very specific effect. Our apologies to anyone we inconvenienced with this error.