Excerpt: This is my third headphone. My first one is Bose QC15, the second one is BeyerDynamics 990 Pro. Among the three I found HD650 to be the most balanced one and least fatigue after hours of listening. The resolution is pretty good and not analytical at all.
Pros: Balanced, Good Value, Great Sound, Lightweight, Upgradable Cable
Cons: Average Resolution, Not Good For Rock, Not Portable
Excerpt: I'm presently listening to these great headphones. The sound-stage is nice and wide. They headphones have tight deep bass, a little recessed midrange but clear. The highs are just right, no sibilance or ting. The only thing I took a star away for is that the clamping force is a bit much.
Pros: Comfortable, Durable, Good Bass, Great Sound, Lightweight, Stylish
Excerpt: I use my HD650's every day in radio. I love them! They're a little bulky, but fit comfortably; sound is full, clear and round. I'm gentle with my cans, but they are designed to take a beating if you tend to be hard on your headphones. I used my last headset (Sennheiser) for 25-years.
Pros: Comfortable, Durable, Good Bass, Great Sound
Summary: HD 650s are my favorite headphones and they are quite easy to be drive by most headphone amp after a well burn in. With the Cablepro or moonaudio upgrade cable the sound of the HD 650 are very well described.
Summary: Sturdy construction, very solid in hand and big cups, this was my first reaction when I had them in hand, a truly open design, with big comfy velour ear pads and detachable cable which I like a lot.
Summary: The HD650 is considered by many audio enthusiasts, professionals and audiophiles to be one of the best dynamic driver headphone in the world, although they have been in the field for more than 10 years, they still are one of the contestants for this title. The hd650 is not my first real headphone.
Summary: There *is* a reason why their name includes the letters HD. And no, "Howling Ducks" or "Hairy Desk" is not a part of that reason.
My first reaction when hearing the HD650s was similar to when I first laid my eyes on a 1080p television; shock and awe.
Summary: I've had the chance to compare these to the older black 650's. Sennheiser denies having changed anything between the two. However, that is absolutely not true. =P The newer versions are considerably brighter and less veiled/dark. Like many others, I removed the driver foam to brighten it even more.
Summary: Sennheiser HD 650 always shines with smooth texture of well balanced sound which one can listen for hours without a single trace of fatigue. I found them secure and comfortable in warm or cool, but not hot environment. They require large boost in power from serious amplifier.