The audiophile Sennheiser HD 650 is the ultimate in open, dynamic headphone design. Developed from the award-winning HD 600, HD 650 headphones feature improved materials for even better sound reproduction. These headphones will captivate you with their expressiveness and emotion while maintaining absolute precision and lifelike reproduction.ÿ
Sennheiser HD 650 Open-Air Pro Headphones Features:
Selected, matched headphone systems with very tight tolerances (+/- 1dB)
Optimized magnet systems for minimizing harmonic and intermodulation distortion
Titanium finish
Quality metal mesh covers for superb open and transparent sound
Reinforced, insensitive to handling noise
Plated 1/4" jack plug with adapter lead to 3.5 mm jack plug
1-year warranty
If you have critical listening requirements, the HD 650 headphones are what you need. Order today!
Sennheiser HD 650 Open-Air Pro Headphones Specifications:
Nominal impedance 300 Ohm
Contact pressure ca. 2,5 N
Weight w/o cable ca. 260g
Jack plug 6,3/3,5 mm stereo
Transducer principle (Headphones) open, dynamic
Ear coupling circumaural
Cable length 3 m
Frequency response (headphones) 10.....39500 Hz
Sound pressure level (SPL) 103 dB (1 Vrms)
THD, total harmonic distortion 0,05 %
Glossary
Nominal impedance
See impedance.
Contact pressure
The wearing comfort of a set of headphones is determined not only by its weight but also by the force with which the earpieces are pressed onto the ears. This force is given in newtons (N), whereby 1 N corresponds to the compressive force which a mass of about 100 g exerts on a solid surface. The DIN Standard 45500 Part 10 limits the maximum permissible contact force to 5 N. Values of between 1.3 and 4 N are common, although lower values apply for open headphones. Higher values can be found in the case of closed headphones. Here, a higher contact pressure is required in order to achieve sufficient sealing, which is important for the reproduction of low frequencies.
Weight w/o cable
Jack plug
A common audio connector in consumer electronics and music industry. Available in various diameters; in the hi-fi segment, 1/8" and 1/4" are widely used. Poles range from one to four. (Examples: headphone jack or jack of an electric guitar).
Transducer principle (Headphones)
Ear coupling
A distinction is made between headphones which are worn on the external ear (supra-aural) and those which surround the ear (circumaural). Open headphones have foam ear pads that rest on the ears or ring pads that surround the ears. Closed headphones, on the other hand, nearly always have circumaural ear pads.
Cable length
The cable length is usually measured between the anti-kink sleeves of the cable (cable length without connectors).
Frequency response (headphones)
The frequency response of a pair of headphones is given within limits defined by the manufacturer.
Sound pressure level (SPL)
Due to the impractical numerical values, the sound pressure is usually given as the logarithmic value of the sound pressure level according to the equation: dB SPL = 20 x log (po / 0.00002 Pa). The abbreviation SPL (sound pressure level) is added in order to make a clear distinction from other uses of dB. The reference sound pressure, which is at the same time the threshold of hearing, is then 0 dB SPL. The threshold of pain is 140 dB SPL. A difference in the sound pressure level of 1 dB is just about perceptible, while a doubling of the sound pressure corresponds to 6 dB and a doubling of the volume corresponds to a rise of 10 dB.
THD, total harmonic distortion
Total harmonic distortion is a measure of non-linear harmonic distortion and is given in %. Non-linear harmonic distortions are signals which were not present in the original before the signal was converted by the headphones. These unwanted signals are caused by the diaphragm, whose movements do not precisely move in time with the electric signals that cause it to move. Unfortunately, this is a feature of all electroacoustic transducers. Although it cannot be completely eliminated, suitable steps can be taken to minimise it. However, the user is not interested in why this distortion takes place but in how great the level of distortion must be for it to become perceptible. According to the findings of several research projects, a total harmonic distortion of 1% in the frequency range of 100 to 2000 Hz is imperceptible. Below 100 Hz, the perceptibility threshold lies at 10%
Posted by Newb audiophile from Montreal Canada on Apr 23, 2009
Experience w/product: I own it
Reviewer's Background: audiophile
Reviewer's Play Style: all (expecially hip hop, techno, pop, rock)
I used them everyday since 6 month from now and they are just superb. The only bad thing about them is the cable that somehow always gets stuck on something ha ha ha so strange. As a beginner audiophile they are solid entrance to the audio world.
Overall
Quality
Features
Value
Get serious, hear?
Posted by notsofast-there from Los Angeles, California on Jun 3, 2008
Experience w/product: I own it
Reviewer's Background: A real-live recording engineer guy
Reviewer's Play Style: Whatever they are playing today
I have been using the venerable Sennheiser HD 580 Precision headphones for many years now in recording and studio applications where open-air phones can thus be used. As a recording engineer of some merit, I can easily afford most any set of headphones, (I refuse to call them 'cans') so it becomes a matter of sound quality and comfort, in that order, which dictates the ones I choose. I meant to get the 650s when they first came to my attention, but I procrastinated, as some of us do.
I did finally get a set of the HD 650s, which naturally should sound better than the 580s. Did I say sound better? Not to disparage the 580s, which are very good headphones, but this is a good example wherein you most definitely get what you pay for. I have never heard anything so exquisite coming from a set of production, professional quality, reference headphones! And I have tried them all. That's right. All.
From the total lack of unnecessary features, protuberances, gewgaws, thick, heavy, clumsy cables and more: from the sheer engineering prowess displayed in the utterly clean sound and the immediate lack of mundane style, these headphones demonstrate the nexus of all that is significant in why do anyone in the recording industry use them at all: they sound absolutely fabulous, are the most comfortable out there and are a bargain for the price.
I needn't go into all the "Wine Spectator"-like reviews and embellish upon the "sound" these headphones make. All I can really say here is how completely impressed I am with every aspect of these headphones. There are none I would rather wear all day long.
Overall
Quality
Features
Value
These things shine with a headphone amp!
Posted by Dave from Oregon on Jul 5, 2007
Experience w/product: I own it
Reviewer's Background: Recording Engineer
Reviewer's Play Style: anything
The HD-650 headphones are remarkable! Their superb clarity, imaging, and comfort make them ideal for...just about anything (except travel)! I HIGHLY recommend using these through a good headphone amp. They take a little more juice than most headphones.
Overall
Quality
Features
Value
Incredibly detailed headphones!
Posted by CWoolery from Chicago on Jan 3, 2007
Experience w/product: I have used it
Reviewer's Background: Sound engineer, vocalsit.
Reviewer's Play Style: N/A
I had the pleasure of auditioning a pair of these against my Beyerdynamic DT-770's and my AKG K240's. The Dt-770's took the crown in the bass department because of their sealed nature, but the Sennheiser 650's were a tad more clear with imaging. My main use for headphones is for studio mixing, so a bright sounding muddy pair of cans is the last thing I want. I would trust the 650's on a mix any day of the week, and if I ever break my Beyerdynamics I'm definitely buying a pair of these!!
Overall
Quality
Features
Value
Not for studios!
Posted by NightWoundsTime from FL on Jul 20, 2004
Experience w/product: I own it
Reviewer's Background: Audiophile Hobbyist
Reviewer's Play Style: rock
This phone is the absolute best value in audiophile headphones. Beware, though, that it WILL NOT sound good with standard headphone jacks found in and around most studios or professional sound applicatons. Why? Because these are extremely high impedance headphones and require a headphone amplifier to truly shine.
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