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English
| HD 820
Specifications
Frequency response
12 – 43,800 Hz (−3 dB)
6 – 48,000 Hz (−10 dB)
Transducer principle
dynamic, closed-back
Ear coupling
circum-aural
Frequency characteristic
diffuse-field equalized
Nominal impedance
300 Ω
Sound pressure level at 1 kHz
103 dB (1 V
rms
)
Long-term input power
max. 500 mW as per EN 60-268-7
THD
≤ 0.02% (1 kHz, 100 dB SPL)
Contact pressure
approx. 3,4 N ± 0.3 N
Weight
approx. 360 g (without connection
cable)
Attenuation
up to 25 dB
Connector (depending on connection
cable, see pin assignment on inside
cover page), gold-plated
XLR-4, balanced, 4-pin
Stereo jack plug:
1/4" (6.35 mm), unbalanced, 3-pin
4.4 mm, balanced, 5-pin
Connection cables
silver-plated, oxygen-free copper
cable (OFC), balanced, shielded,
para-aramid reinforced, 3 m
Temperature range
operation: −10°C to +55°C
storage: −20 to 70°C
Relative air humidity
(non-condensing)
operation: 10 to 80%,
storage : 10 to 90%
Reference diffuse-field frequency response curve
The individually measured diffuse-field frequency response curve for your
HD 820 headphones can be found on the supplied USB flash drive. The
reference diffuse-field frequency response curve can be found on the
inside cover page.
What is the diffuse-field frequency response curve? In an anechoic
chamber, 8 highly linear loudspeakers emit noise signals independently
of each other. In the central area of the chamber, the various sound data
meet and are superimposed on each other to form a diffuse field, in which
it is no longer possible to determine from which direction the sound is
coming. This noise is then varied in distances of a third and reproduced
alternately over the speakers and the headphones to be measured. A large
number of test persons then evaluate the difference in volume between
the room noise and the noise in the headphones.
The ideal state is when the volume impression
between the diffuse field and the headphones is the same. Diffuse-field
equalized headphones provide a clearly more spatial impression and make
it easier to determine whether sounds are coming from the front or rear.
Put simply, the sound events take place outside the head and are not
confined to the space between the ears.
