Headphones

headphoneearphoneearphonesearbudsheadsetheadsetsearbudear budsStereo headphonescircumaural
Headphones (or head-phones in the early days of telephony and radio) traditionally refer to a pair of small loudspeaker drivers worn on or around the head over a user's ears.wikipedia
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Headset (audio)

headsetheadsetsBluetooth headset
In the context of telecommunication, a headset is a combination of headphone and microphone.
A headset combines a headphone with a microphone.

Portable media player

media playerportable media playersdigital audio players
Headphones connect to a signal source such as an audio amplifier, radio, CD player, portable media player, mobile phone, video game console, or electronic musical instrument, either directly using a cord, or using wireless technology such as Bluetooth, DECT or FM radio.
Most portable media players are equipped with a 3.5 mm headphone jack, which users can plug headphones into, or connect to a boombox or hifi system.

Wireless

wireless communicationwireless communicationswireless internet
Headphones connect to a signal source such as an audio amplifier, radio, CD player, portable media player, mobile phone, video game console, or electronic musical instrument, either directly using a cord, or using wireless technology such as Bluetooth, DECT or FM radio.
Other examples of applications of radio wireless technology include GPS units, garage door openers, wireless computer mouse, keyboards and headsets, headphones, radio receivers, satellite television, broadcast television and cordless telephones.

Bluetooth

Bluetooth 4.0Bluetooth 5.0Bluetooth 2.0
Headphones connect to a signal source such as an audio amplifier, radio, CD player, portable media player, mobile phone, video game console, or electronic musical instrument, either directly using a cord, or using wireless technology such as Bluetooth, DECT or FM radio.

Audiophile

audiophilesAudiophiliaaudio enthusiast
Headsets designed for telephone use typically cannot reproduce sound with the high fidelity of expensive units designed for music listening by audiophiles. In 1958, John C. Koss, an audiophile and jazz musician from Milwaukee, produced the first stereo headphones.
High-end components include turntables, digital-to-analog converters, equalization devices, preamplifiers and amplifiers (both solid-state and vacuum tube), horn and electrostatic speakers, power conditioners, subwoofers, headphones, and acoustic room treatment in addition to room correction devices.

Crystal earpiece

earphonespiezoelectric crystal
The earbud uses either a moving iron driver or a piezoelectric crystal to produce sound.
A crystal earpiece is a type of piezoelectric earphone, producing sound by using a piezoelectric crystal, a material that changes its shape when electricity is applied to it.

Phone connector (audio)

headphone jackTRRSTRS connector
Headphones that use cables typically have either a 1/4 inch (6.35mm) or 1/8 inch (3.5mm) phone jack for plugging the headphones into the audio source.
Of these many varieties, only the two-conductor version with a rounded tip profile was compatible between different manufacturers, and this was the design that was at first adopted for use with microphones, electric guitars, headphones, loudspeakers, and many other items of audio equipment.

Audio signal

audioaudio channelchannel
Headphones originated from the telephone receiver earpiece, and were the only way to listen to electrical audio signals before amplifiers were developed.
Loudspeakers or headphones convert an electrical audio signal back into sound.

Sound quality

audio qualityqualityAudio
The requirement for high sensitivity meant that no damping was used, so the frequency response of the diaphragm had large peaks due to resonance, resulting in poor sound quality.
When applied to specific electronic devices, such as loudspeakers, microphones, amplifiers or headphones sound quality usually refers to accuracy, with higher quality devices providing higher accuracy reproduction.

Moving iron speaker

moving iron driversbalanced armaturesmoving iron cores
These early headphones used moving iron drivers, with either single-ended or balanced armatures.
Modern damped moving iron mechanisms can provide respectable sound quality, and are used in headphones.

CD player

CD changerCD playersCompact Disc player
Headphones connect to a signal source such as an audio amplifier, radio, CD player, portable media player, mobile phone, video game console, or electronic musical instrument, either directly using a cord, or using wireless technology such as Bluetooth, DECT or FM radio.
Most CD players produce an output signal via a headphone jack or RCA jacks.

Bone conduction

bone-conductingaudible vibrations through his skullbone conductor
A third type are bone conduction headphones, which typically wrap around the back of the head and rest in front of the ear canal, leaving the ear canal open.

Koss Corporation

KossJohn C. KossJohn Koss Sr.
In 1958, John C. Koss, an audiophile and jazz musician from Milwaukee, produced the first stereo headphones.
Koss Corporation is an American company that designs and manufactures headphones.

Silent disco

Headphone Discosilent discosSilent Gig
Cordless headphones are used with events such as a Silent disco or Silent Gig.
A silent disco or silent rave is an event where people dance to music listened to on wireless headphones.

Transducer

transducerstransductiontransduce
They are electroacoustic transducers, which convert an electrical signal to a corresponding sound.

Radio

radio communicationradio communicationswireless
Headphones connect to a signal source such as an audio amplifier, radio, CD player, portable media player, mobile phone, video game console, or electronic musical instrument, either directly using a cord, or using wireless technology such as Bluetooth, DECT or FM radio.

Loudspeaker

loudspeakersspeakerspeakers
Headphones let a single user listen to an audio source privately, in contrast to a loudspeaker, which emits sound into the open air for anyone nearby to hear.
Sensitivity is usually defined as so many decibels at 1 W electrical input, measured at 1 meter (except for headphones), often at a single frequency.

Disc jockey

DJDJsdeejay
Headphones are also used by people in various professional contexts, such as audio engineers mixing sound for live concerts or sound recordings and DJs, who use headphones to cue up the next song without the audience hearing, aircraft pilots and call center employees. In the professional audio sector, headphones are used in live situations by disc jockeys with a DJ mixer, and sound engineers for monitoring signal sources.
Mixers are also used to pre-listen to sources of recorded music in headphones and adjust upcoming tracks to mix with currently playing music.

Audio engineer

engineeringengineersound engineer
Headphones are also used by people in various professional contexts, such as audio engineers mixing sound for live concerts or sound recordings and DJs, who use headphones to cue up the next song without the audience hearing, aircraft pilots and call center employees. In the professional audio sector, headphones are used in live situations by disc jockeys with a DJ mixer, and sound engineers for monitoring signal sources.
Alternatively they might work in audio companies (e.g. headphone manufacturer), or other industries that need audio expertise (e.g., automobile manufacturer), or carry out research in a university.

Headphone amplifier

amplifieramplifiersheadphone amp
In this case, an external headphone amplifier may be beneficial.
A headphone amplifier is a low-powered audio amplifier designed particularly to drive headphones worn on or in the ears, instead of loudspeakers in speaker enclosures.

Hearing aid

hearing aidsHearing instrumentsHearing Aid Compatibility
Smaller earbud type earpieces, which plugged into the user's ear canal, were first developed for hearing aids.
The processed audio signal is transformed into audio signal and output to the user into the headphones/headset.

DJ mixer

mixermixersdisco mixer
In the professional audio sector, headphones are used in live situations by disc jockeys with a DJ mixer, and sound engineers for monitoring signal sources.
DJ mixers allow the DJ to use headphones to preview the next song before playing it to the audience.

Amplifier

amplifiersamplificationelectronic amplifier
Headphones connect to a signal source such as an audio amplifier, radio, CD player, portable media player, mobile phone, video game console, or electronic musical instrument, either directly using a cord, or using wireless technology such as Bluetooth, DECT or FM radio.

Triode

triode amplifiertriode tubeTriodes
Impedance of 1000 to 2000 ohms was common, which suited both crystal sets and triode receivers.
Amplifying triode radio receivers, which had the power to drive loudspeakers, replaced weak crystal radios, which had to be listened to with earphones, allowing families to listen together.

Nathaniel Baldwin

Baldwin HeadphonesBaldwin Radio CompanyNathan Baldwin
The first truly successful set was developed in 1910 by Nathaniel Baldwin, who made them by hand in his kitchen and sold them to the United States Navy.
"Headphones", two telephonic receivers on a headbow, were already in use by early wireless radio operators as early as 1906-1907, prior to Baldwin's telephonic receiver improvement and patent in 1910.