I've never noticed, or I guess cared about a lack of sub bass in the DT880's. I've made a bunch of quite heavy bass music on them. But then I've also made a bunch of bass heavy music on NS-10's. :) DT770's I like also and are better I reckon for listening/mixing when traveling. 

Beyer DT880's are great I reckon for music mixing and composing. They sound nice and flat/neutral to me, have great resolution, are comfortable. I haven't heard the other recommendations for comparison but I prefer the DT880's to the Senn HD600's and 650's. Check them out. 

Hi there. I have a pair of DBA-02 mark 1 that have developed a problem. The right channel is significantly quieter than the left. I took off the rubber caps and tried to carefully clean them. There was a bunch of wax in the right hand plastic tube. The problem persists so i was wondering can you...