A unos este sondo difuso les suena más real:
Y a otros no:The HD 650 is a true audiophile-quality stereo headphone superseding the previous HD 600 model. It connects directly to most audio devices accepting a 6,3/3,5 mm jack plug.
Sound quality is achieved by the use of well damped, extremely lightweight but powerful aluminium voice coils ensuring excellent transient response and clear, transparent and balanced sound. The bass goes down to a very satisfying 40 Hz.
The HD 650 uses the "diffuse-field" loudness equalization principle (as opposed to the "free-field" equalization type) to attempt to "flatten" the perceived frequency response. Diffuse-field EQ assumes that the listener is in front of a sound source in a listening room with reflecting walls. Because diffuse-field EQ is based on an "average" head/ear shape and room model, it may not appeal to all listeners or sound "natural" with all recordings. Personally, I have yet to find a better type of headphone system (given the fact that I listen in a quiet environment.) The circumaural design - featuring ring pads that surround the ears - and the velveteen "breathing" fabric covering the ear pads are very comfortable (even over extended listening sessions.)
I have used Sennheiser models since 1975, beginning with the Sennheiser 424 at the beginning of the seventies, "upgrading" to Stax electrets headphones in 1980. I returned to Sennheiser for its HD 565 Ovation model in 1985 and bought HD 600 earspeakers in 2004.
An audiophile friend did lend me his HD 650 to let me audition them for a while and they sure sound pretty impressive, displaying more nuance than the HD 600. However, the results are not significantly better to me than the ones I am already enjoying from my HD 600. For this reason, I have decided not to splash money on them. Should you buy a new high-resolution headphone set right now, I would although advise you to go for the HD 650.
Now, I am quite happy to learn that many people enjoy using the HD 650 even when associated with "average" sources and assorted electronics.
However, you should be aware that you would not be able to enjoy the HD 650 (or HD 600) to the full unless you also use true audiophile grade associated gear.
Also, do not forget that headphones present an unusual acoustic environment in which human ears were not designed to operate. This said, to be musically valid, the experience of listening to headphones does not have to be identical to that of listening to one's main system any more than listening to one's stereo need be identical to the real event. You do give up some attractive imaging information when listening to even a top headset. Ambience suffers as well. What you gain is immediacy, a sense of proximity to the music that has its very own appeal.
Like a lot of people on here I looked at these headphones on and off for quite a while. Having read the reviews I thought they must be good so I brought a pair. I have used these headphones with a Cyrus 8x cd player and Cyrus 8vs2 Amplifier and Sonus Faber Signam speakers. I also have a fantastic Sony NW3000 mp3 player with Sony MDR EX90 in ear phones. The Sennheiser HD650 headphones are a little disapointing to me. Yes they are very detailed and smooth, but to me they lack attack and excitment, almost sleepy, the bass is detailed but lacks the ability to reproduce the very low frequencies with any real weight or feeling. Some people may say I need to use a headphone amp, but if Cyrus can't design an £1000 amp with a decent headphone amp inside, then I will start to wonder if the HiFi world is a con ? From a comfort point of view I can feel the distinctive sausage shape of the ear piece cusion against my face/head when you start a music session, although this fade's after you have had them on for a while, but you tend to remain awair of their overall size. If you like a laid back sound, these are for you, otherwise compair them against other makes befor you buy, wish I had done, I am sure their is better out their for the money.