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HD 25-1 II - Sennheiser USA

Article No. 502188

Description
Technical Data
Accessories
Variants

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DJ Headphones - High Attenuation of Ambient Noise

$199.95

General Description

The closed-back HD 25-1 II purpose-designed, professional monitoring headphones offer high attenuation of background noise. Capable of handling very high sound pressure levels and of extremely robust construction, these headphones perform exceptionally well in high-noise environments, e.g. ENG, sound reinforcement, studio monitoring and audio equipment testing. The capsule is rotatable for one-ear listening. Ideal monitoring headphones for cameramen and DJs.

Features

Very lightweight and comfortable, even if used for long periods
High maximum sound pressure level
65 .nominal impedance for universal compatibility
Tough, detachable steel cable
Neodymium ferrous magnet systems and lightweight aluminium/copper voice
Built-tough with a 2 YEAR warranty!
Compatible (listen only) with latest generation of tablets

Delivery Includes

1 HD 25-1 II
1 adapter to ¼” (6.3 mm) stereo jack plug
1 Bag
Soft ear pads (1 pair)

DJ Headphones - High Attenuation of Ambient Noise

$199.95

Technical Data

Cable length	Approx 5 ft. (1.5 m.)
Contact pressure	Approx. 2.5 N
Ear coupling	On-the-ear
Frequency response (headphones)	16 - 22,000 Hz
Jack plug	3.5/6.3 mm stereo
Load rating	0.2 W
Nominal impedance	70 Ω
Sound pressure level (SPL)	120 dB (SPL)
Total harmonic distortion (THD)	< 0.3 %
Transducer principle	Dynamic, closed
Weight w/o cable	Approx.4.9 oz. (140 g)
UPC code	615104135703
EAN Code	4044156023793

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DJ Headphones - High Attenuation of Ambient Noise

$199.95

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DJ Headphones - High Attenuation of Ambient Noise

$199.95

Variants

HD 25-13 II	Model #502102	$299.95
HD 25-1 II, with 600Ω impedance, 3m steel cable, straight jack plug
HD 25-C II	Model #502104	$299.95
HD 25-1 II with 3m coiled cable, straight jack plug

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$199.95

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$199.95

Glossary

Cable length

The cable length is usually measured between the anti-kink sleeves of the cable (cable length without connectors).

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.

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.

Frequency response (headphones)

The frequency response of a pair of headphones is given within limits defined by the manufacturer.

Jack plug

A common audio connector in consumer electronics and music industry. Available in various diameters; in the hi-fi segment, 1/8" and ¼" are widely used. Poles range from one to four. (Examples: headphone jack or jack of an electric guitar).

Load rating

The load rating is the amount of electric power which - according to the manufacturer´s specifications - can be continuously supplied to a set of headphones over a period of time without causing damage. According to DIN 45500 Part 10, the load rating must be at least 100 mW. Testing is carried out using a special noise signal which is supplied to the headphones over a period of 100 hours.

Nominal impedance

See impedance.

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.

Total harmonic distortion (THD)

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%.

Transducer principle

Two transducer principles have become established for the conversion of electric energy into mechanical energy: electrodynamic and electrostatic transducers, whereby the latter is only to be found in audiophile systems, due to their relatively high manufacturing costs. Electrodynamic transducers basically consist of a ring-shaped permanent magnet and an oscillation coil, which is fixed to the receiver diaphragm. When an audio-frequency alternating current is passed through the oscillation coil, it is caused to vibrate in accordance with the audio-frequency alternating current, thus causing the diaphragm to vibrate in the same way.

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Professional Audio

HD 25-1 II - Sennheiser USA

Article No. 502188

DJ Headphones - High Attenuation of Ambient Noise

$199.95

General Description

Features

Delivery Includes

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DJ Headphones - High Attenuation of Ambient Noise

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Technical Data

DJ Headphones - High Attenuation of Ambient Noise

$199.95

Recommended Accessories

DJ Headphones - High Attenuation of Ambient Noise

$199.95

Variants

$199.95

$199.95

$199.95

Glossary

$199.95

More Product Information

Purchase Information

More Information