- Nov 25, 2013
It's worth a mention that the discussion is about the newer 'silver driver' revisions, some people believe Sennheiser has been quietly upgrading the HD6x0 line. Earpad age makes a pretty big difference in sound as well.
Just jumping in here. Considering how Sennheiser clearly employs a premium pricing strategy ($500 for the nine-year old HD650?), I find it extremely unlikely they would "quietly" upgrade their two most famous models and not tell anyone. If anything, they would market this change as an upgrade, while keeping prices steady. (Actually, prices have risen the last two years on these two old products.)
I'm not disputing they've changed the design, just that they would improve the product and not tell anyone.