Copper:
Balanced U/V shape. Quicker driver, less decay but still good. Good solid bass, bright enough treble just barely north of accurate. Requires more play w/ insertion adn placement for optimal signature. Although that can be used to tune the signature as well. Definitely tthe pick for Metal and Electronic. Could be seen as more analytical and slightly less engaging than the MDs in comparison over time. Wider soundstage. Definitely better suited to the technically conscious w/ their music.
MD:
Think Dynamic version of SM3 sound but more complete mids and coherent sound, not as technically focused. A bit slower than the Copper but better decay and reverb. More forward mids and tip dependent on opening up clarity and cooling the warmth. Can be inserted deeper due to housing shape. The no brainer choice for hip/hop, rap, and Jazz (unless you want more emphasis on horns for Jazz than Piano and Cello). These are euphonic in that they can expand your content by playing even poorly mastered modern stuff. Soundstage more intimate and 'smaller' but you can sense actual depth and some imaging where it is like a small club stage. Not really blobish IMO, others may disagree. Not disimilar to the M50s but w/ more forward mids. But remember IEM v headphones here, adjust expectations accordingly. Suited better to the intuitive and emotive listener IMO.
