Mid and upper bass bump. Over time thick and syrupy, even pulls low male voices into the cavern.They only had SS amp in the shop and HD600 was too much for me, the bass as well was better on 650.
What amp? BHOC w/ speedball kills my Rag 1 on the 600.I actually find my HD650 nicely driven directly from my macbook, OTL amp gives it a bit of extra bass/gets rid of a grainy texture in mids/highs, but nothing in regards of drastic changes.
hak said: The big advantage of sennheisers is that I can listen to poor recordings and Sennheiser can beat more expensive offerings(as an example campfire cascade for me), but people claiming that these series sits in tier 1 simply haven't heard a good flagship which suits their tastes.
The 600/650 is the first stop for many. They are well better than many that cost more. They are not modern flagships - agree.