Sennheiser has recently announced an HD 650 successor, the HD 660 S! Retail will be $500 US, $680 CAD. 150 ohms. What everyone’s thoughts? I recently bought a pair of the 6XXs from Massdrop, and a Bottlehead Crack (with speedball), but I’m still intrigued. Please excuse me if this had already been posted, a quick search yielded no relevant results.