How To Decrypt The Data Sheet… Headphones

The data sheet of a high-tech device gives valuable information on its configuration, its possibilities, but also on its compatibility with your existing equipment. Must be able to interpret them, as they are sometimes complex. We offer to help you find your way. Today, we look at headsets

-Type Of Helmet

According to percomputer, there are 3 general types of helmets: open, closed, ear.

An open helmet is a helmet that leaves filter all a part of the sound outward via an acoustically transparent grid. Rarely used in the field of nomadic headphones for obvious reasons, we find above all this technology on the sedentary helmets, particularly on the top and the top of the range.

In contrast, a closed helmet retains full sound inside the headphones. There are supra-aural headphones (or supra atrial) that arises on the ear and provides insulation variable, and on the other hand the helmet circum-aural (or circum atrial) which includes the ear and usually offers better insulation.

Finally, the -earheadphones, which, as its name suggests, fits into the ear. This type of headphone has acquired its letters of nobility with the explosion of mobile readers and smartphones. -Ear headphones come with several pairs of nozzles which allow perfectly adapted to your morphology.

There is a fourth type of helmet, the Atria, but it is declining. Often provided original with smartphones or mobile readers, they fish too often by a very average quality and improved ergonomics. Their main asset is a price generally very accessible.

There are also the headphones open of closed headphones. On a closed headphone, sound is theoretically sealed while open headphones let filter the sound outwards, generally through an acoustic grid. The first offer better sound insulation and often more present serious. The latter have the advantage an more open and airy and a more natural, although less obvious serious. Closed headphones are more adapted to the portable listening while open helmets are generally intended for a sedentary use.


Expressed in Ohms (Ω), it measures the resistance to the passage of an electrical signal. Sound is conveyed by an electrical signal, the nominal impedance of the headphones will necessarily affect its audio rendering. It is thus they found included impedances between 16 and 64 Ω in general on the helmets dedicated readers nomads, and up to several hundred ohms on professional headsets. Plug in a headset for a sedentary use on an MP3 player may quickly empty the battery. Conversely a nomadic headphones plugged into an amplifier stereo headset entry will give a suffering distortion sound. For more details, see our article devoted to the impedance headphones. Just remember that 600 Ohms headphones is not suitable for portable use, and that 16 Ω impedance headphones will be inaudible on the headphone jack to a stereo.

-Frequency response

Expressed in Hz for bass and KHz for the high frequencies, it measures theextent of the bandwidth of a helmet. More simply, this measure is supposed to tell you how the helmet down in the grave (the number in Hz longer low it down) and monte in the treble (higher the number in KHz better). In reality, this figure is more of a commercial argument, an excellent helmet that can display a little extended response while mediocre headphones will rise up and down very low.Musicality is not just about numbers! Besides that so often used in portable listening MP3 files are largely limited to the two ends of the bandwidth. Let it be said, what is lost when compressing the files will never be récréé by a helmet,he was the best in the world. This is so a technical indication to be taken into account but it augurs nothing of the audio quality of the headphone.


Expressed in decibels (dB), it is also called performance, a more meaningful term in my opinion. Indeed, the sensitivity measure the sound level that can be achieved for a given power. To put it simply, to power given, a higher sensitivity headphone will give a higher volume. We find this same principle on high-fidelity speakers. The interest of this measure is that a helmet to high sensitivity will be easier to feed than a helmet to medium or low sensitivity.


We’re talking 3.5 mm jack for the connection of mp3 players, smartphones, tablets and computers. For what is stereo channels and separate elements, connectors 6.35 mm jack, bigger, is much more common. There are adapters, sometimes provided in the packaging, that allow to move from one use to another. Other accessory sometimes provided in the box, theair adapter that allows to connect your headset from the present taken in double jack on aircraft seats. Needless to say that the sound of the helmets of the trade is almost always higher than the mediocre helmets provided by the airlines. Last point, on nomadic headphones, choose preference for an angled jack, such as the Visual below. In a Pocket, they are less exposed to the friction and traction than a right jack.


Ideally, Choose helmets that the cable is removable. In case of deterioration, simply change to continue using your headset. Turn on their length, often around 1 m 10 – 1 m 20. Sedentary helmets are logically provided with longer cables, sometimes up to 3 m. on most nomadic headphones, there is also a remote control and a microphone for navigation between tracks and making telephone communication. Unfortunately, the compatibility of these devices is too often limited to Applemobile devices, at the expense of yet largely majority Android products.

-Noise reduction

Some helmets offer a function of active noise reduction. This process, very useful to listen to his music in a noisy environment or to isolate themselves, is to analyze the ambient noise and oppose him opposite noise, both are cancelling. Some brands, Bose in mind, are more effective than others on this criterion. You must also take into account theautonomy of these helmets, and check that listening will be possible once the battery or the battery.Depending on your needs, think about the type of power supply. In case of travel extended without access to the sector, headphones, battery-operated will be preferable to a helmet on battery for example.


Thelisten to wireless is another strong trend of the moment. The headphones Bluetooth now offer a comfortable autonomy, allowing for a whole day or even several days. Keep in mind that this wireless comfort is paid by adegradation of sound compared to wired listening. As much as possible, choose compatible headsets Bluetooth AptX, a standard audiophile more qualitative and less destructive. Wireless headsets, include number of sports helmets.Often in ear clip format, they adopt fixing systems which differ according to the manufacturer. They must remain firmly fixed in the effort but also comfortable for several hours. The sound quality is logically often indented. In this area, there is no secret, try them. Last type of wireless, the helmets UHFheadset. Recharged on a basis related to the area, these helmets can be used to take advantage of the sound track of a film or its TV without disturbing others or its vicinity, especially in the evening. But there are also vocation audiophile Sennheiser in particular.