Excerpt: These headphones sound absolutely incredible! They deliver as promised by Sennheiser and as commented upon by other reviewers. I was looking as a slightly lesser model to upgrade from my old Sennheiser HD-424's (yes, from the 70's and still going strong after several earpad replacements!). When I found the 650's with a mail-in rebate, I "raised the bar" on my purchase and, man-oh-man, am I glad I did.
Pros: Comfortable, Durable, Good Bass, Great Sound, Nice Storage Box, Stylish
Excerpt: I use the HD650 headphones with a newly purchased desktop headphone amplifier connected to my computer by a small DAC. Before purchasing the HD650, I was listening with the HD598 headphones. I thought they were a capable set of headphones, but when connected to the new amp I began to think I had purchased a lemon. The HD650s changed that perception right out of the box.
Excerpt: Never had anything like these. Have had Sony's and currently Bose but even with my age related hearing loss, I can hear how good these cans are compared to what I've been using. Now I can hear the quality in the High Def FLAC and DSD music I've been buying online!
Summary: After using some closed phones for a while, I started looking for an open model, because a) I actually want to hear if my wife is calling me or if someone's at the door, and b) I was looking for a more open soundstage. I'm playing FLAC and high bitrate MP3 through a Soundblaster Z to an AudioEngine NS-22 amp, into which these phones are connected. The sound is buttery smooth, which is good because I listen to more jazz and female vocals where I want the sound to be warm.
Pros: Creates articulate but smooth sound. It's neither clinical nor sloppy. Reasonably comfortable. They're lightweight and fairly low profile.
Summary: After spending around 40 hours with these headphones I can safely say they're becoming my go-to for almost any type of listening. Their tone is very pleasing to listen to for hours on end and their design makes long listening sessions non fatiguing and effortless! Honestly I feel like I'm beating a dead horse with these compliments that have been said a million times. Just buy them!
Pros: They've become incredibly comfortable after a few days of breaking in the cushions and clamping force. I've also noticed stringed instruments in particular have become incredibly lifelike with an almost palpable level of detail in addition other tones like drum hits having very lifelike decay.
Summary: I had long wanted to purchase a pair of Sennheisers and eventually got the 598 and 600 but returned both of them. They just didn't excite me. The 650s, however, are terrific, even without an amp. I have no doubt they'll be even better with a headphone amp. I haven't listened for over an hour at a time, so I can't speak to long-term comfort, but generally speaking they are comfortable and well-made. They come with a 1/4 adaptorwhich is helpful.