Sennheiser HDR 120

Hi today i was lucky enough to aquire a pair of Sennheiser HDR 120'S i got due to my tv being a disturbance and as of the moment i can only report good things.

Sennheiser use the jolly good supra-aural earpads which for people yet to wiki it means they sit on your ears rather than around them(see below) , this improves the comfort loads however makes them more prone to slipping off your head.






By now you have probably noticed the interesting stand that comes along with thse great headphones well the good news it charges them too! and as far as i can tell it doesnt matter which way you put them on the charger, it can be wall mounted too.

Theres no elastic headband as on other cordless headphones instead senhiser have gone for the traditional clunk up clunk down headband of which the padding is a dream. All in all a good buy for about £50 i overpaid at maplin where they have adjusted the price £5 up from the catalogue to £54.99 but i have found them online for £44.99 . Below is the sennheiser info and the tech specs




The RS 120 is an open, supra-aural wireless RF headphone system. Its transparent and well-balanced sound with great bass response makes this system an ideal choice for all types of music and TV applications. Furthermore, its innovative "easy recharge" function offers the ultimate in convenience when it comes to charging and storing your wireless headphones. Enjoy total freedom of sound, stylish design and maximum comfort, all at an affordable price.

Features

Open, stereo, supra-aural, wireless RF headphone system Detailed, analytical sound reproduction with strong bass response Perfectly suitable for all types of modern music and TV applications "Wireless freedom of sound" with reception through walls and ceilings, even outside in the garden Range of up to 100 metres Three selectable RF channels Control elements conveniently positioned to provide easy, intuitive operation Transmitter with metal cradle for storing and recharging the headphones. Nesting the headphone couldn't be easier ? no more fumbling like with most other systems in the market! Optional wall mounting of transmitter possible Very lightweight headphones, extremely comfortable to wear Appealing, modern design Rechargeable NiMH batteries included (size: AAA) 2-year warranty RS 120 Article No. 09920







General Description

The RS 120 is an open, supra-aural wireless RF headphone system. Its transparent and well-balanced sound with great bass response makes this system an ideal choice for all types of music and TV applications. Furthermore, its innovative "easy recharge" function offers the ultimate in convenience when it comes to charging and storing your wireless headphones. Enjoy total freedom of sound, stylish design and maximum comfort, all at an affordable price.




Features



Open, stereo, supra-aural, wireless RF headphone system



Detailed, analytical sound reproduction with strong bass response



Perfectly suitable for all types of modern music and TV applications



"Wireless freedom of sound" with reception through walls and ceilings, even outside in the garden



Range of up to 100 metres



Three selectable RF channels



Control elements conveniently positioned to provide easy, intuitive operation



Transmitter with metal cradle for storing and recharging the headphones. Nesting the headphone couldn't be easier ? no more fumbling like with most other systems in the market!



Optional wall mounting of transmitter possible



Very lightweight headphones, extremely comfortable to wear



Appealing, modern design



Rechargeable NiMH batteries included (size: AAA)



2-year warranty

echnical Data
	Max. Sound pressure level (aktiv)		106 dB
	Powering		9V DC (transmitter); AAA batteries (receiver)
	Weight (Transmitter)		200 g
	Weight (Receiver)		230 g (inc. batteries)
	Range		up to 100 m
	Modulation		FM Stereo
	Signal-to-noise ratio		> 65 dBA
	RF frequency range		863 ... 865 MHz or 926 ... 928MHz
	Dimensions (Transmitter)		85 x 225 x 133 mm
	Frequency response (headphones)		22.....19500 Hz
	Transducer principle		dynamic, open
	Operating time (Accupack)		approx. 20-25 h
	THD, total harmonic distortion		<>
	Jack plug		3,5mm / 6,3 mm stereo (863-865 MHz), cinch (926-928 MHz)

Glossary
	Max. Sound pressure level (aktiv)
	The maximum sound pressure a unit can reproduce before a given THD is reached.
	Powering
	Common description, where the electric power comes from.
	Weight (Transmitter)
	Weight (Receiver)
	Range
	See RF wireless headphones, transmission loss.
	Modulation
	The process in which one wave is varied by some parameter of another wave, for example, an RF carrier frequency that is modulated by an audio signal. Types of modulation include amplitude modulation, frequency modulation, pulse code modulation and pulse width modulation.
	Signal-to-noise ratio
	The signal-to-noise ratio is the difference between the reference sound level of 94 dB (equivalent to 1 Pa) and the equivalent noise level. Studio condenser microphones generally have a signal-to-noise ratio of 74 to 64 dB (CCIR) or 84 to 74 dB(A).
	RF frequency range
	The range of frequencies to which a unit (e.g. a receiver) can be tuned.
	Dimensions (Transmitter)
	Frequency response (headphones)
	The frequency response of a pair of headphones is given within limits defined by the manufacturer.
	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.
	Operating time (Accupack)
	Indicates the operating time with a new, fully charged accupack.
	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%.
	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).

Glossary

Recommended Accessories
	Description	Product	Article No.
	Additional RF wireless headphones (without transmitter) in 864 and 926 MHz available in Feb/March '04: HDR 120 (Art. Code 009930 and 009931)		009931)

Variant
	Product	Article No.
	RS 120-8	09920
	Transmission frequency: (863.0 MHz ? 865.0 MHz) 3,5-mm/6,3-mm stereo connector
	RS 120-8-UK	09921
	Transmission frequency: (863.0 MHz ? 865.0 MHz) 3,5-mm/6,3-mm stereo connector UK power supply
	RS 120-9	09922
	Transmission frequency: (925.8 MHz ? 927.8 MHz) cinch connector
	RS 115-8	500484
	Colour variant of the RS 120 with striking blue transmitter faceplate and ear cup covers

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