Simply the finest 'phones you'll find.

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

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
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 t
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
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 ca