SENNHEISER HD 201 Headphones

SENNHEISER HD 201 - picture used is for illustration only The ideal entry into the world of powerful stereo sound:The HD 201 has good attenuation of ambient noise with outstanding (...) See more See less

wearing comfort at an affordable price. 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). Nominal impedance See impedance. Weight w/o cable 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. 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 distinc (Description excerpted from: I2020)