DONGGUAN KOLLSUN INDUSTRIAL & INVESTMENT CO.,LTD

2007-10-31

Company introduction

Dongguan kollsun Industrials&Investment Co., Ltd. is a professional high-tech acoustic product enterprise combined with development, production, sales and after-sales service.We manufacture high-quality stereo headphones and flat panel speakers. Headsets are involving in wireless headset,Ear bone condution, noise reduction headphones, HI-FI high-fidelity headphones,Telephone headphone etc.，。For flat panel speaker，we can provide you with varies of style, such as Chinese, European-style, abstract and other options available to customers.
Our products are widely used in offices,teaching,family&personal audio-visual, aviation and communications and other audio-visual field.United States, Europe, Southeast Asia, Arabia, South America and other countries and regions are our main exported markets.We enjoy a high praise from both inland & aboad.To ensure the product quality and to meet the international standards ,we strictly implement ISO-9001, ISO14001 management and FCC, CE certificate.

Contact Us

Address: RM7C2,NO.A,ShengHeBuilding,NanChengDistrict,DongGuan,GuangDong,China.
Zip: 523009
Tel: 0086-769-22906850,22984518,22986518
Fax: 0086-769-23029850
Person: Linda
E_mail;
Website: www.kollsun.com

Earphones-MP3 Earphones KS-S260

2010-3-4 14:05:48

KS-S260

SPECIFICATIONS:

Speaker diameter:Φ10

Impedence:32Ω

Speaker Sensitivity:110±3DB

Frequency response: 20-20K HZ

Max power: 10MW

Skype earphones-SKYPE Earphones KS-G120

2010-3-4 14:05:48

-nbsp;

KS-G120

SPECIFICATIONS:

Plug:3.5mm mononickel-plated

speaker dimension: 20mm，impedance: 32-Omega;

sensitivity:109db+5db,

frequency response:20-20khz

cable length:180cm

Wireless headphones-Wireless Headphones KS-TW970

2010-3-4 14:05:48

-nbsp;

KS-TW970

FEATURES:

1.-nbsp;-nbsp;-nbsp;-nbsp;-nbsp;-nbsp; ultra-high frequency, high fidelity

2.-nbsp;-nbsp;-nbsp;-nbsp;-nbsp;-nbsp; ultra-low distortion

3.-nbsp;-nbsp;-nbsp;-nbsp;-nbsp;-nbsp; transimission through walls,

floors, ceiling etc. with ease

4.-nbsp;-nbsp;-nbsp;-nbsp;-nbsp;-nbsp; strong stereo sound

5.-nbsp;-nbsp;-nbsp;-nbsp;-nbsp;-nbsp; strong anti-disrupption capability

6.-nbsp;-nbsp;-nbsp;-nbsp;-nbsp;-nbsp; high power output

7.-nbsp;-nbsp;-nbsp;-nbsp;-nbsp;-nbsp; stable performance

8.-nbsp;-nbsp;-nbsp;-nbsp;-nbsp;-nbsp; designed for EU-amp;US markets

9.-nbsp;-nbsp;-nbsp;-nbsp;-nbsp;-nbsp; simple-amp;elegant look

10.-nbsp;-nbsp; widely applicable to PC, TV, DVD,VCD, MP3,

MP4 and other major audio sources

SPECIFICATIONS:

1)-nbsp;-nbsp;-nbsp;-nbsp;-nbsp; PLL technology

2)-nbsp;-nbsp;-nbsp;-nbsp;-nbsp; multi-directional transmission

3)-nbsp;-nbsp;-nbsp;-nbsp;-nbsp; frequency: 863MHz.863.5MHz864MHz

or 913MHz 913.5MHz 914MHz.

4)-nbsp;-nbsp;-nbsp;-nbsp;-nbsp; frequency range:20Hz ~ 20KHz

5)-nbsp;-nbsp;-nbsp;-nbsp;-nbsp; distortion: <=0.5%

6)-nbsp;-nbsp;-nbsp;-nbsp;-nbsp; S/N Ration: > 60 Db

7)-nbsp;-nbsp;-nbsp;-nbsp;-nbsp; frequency range:20Hz ~ 20KHz

8)-nbsp;-nbsp;-nbsp;-nbsp;-nbsp; R/L channel separation: >30dB

9)-nbsp;-nbsp;-nbsp;-nbsp;-nbsp; transmission range: 100 meters

10)-nbsp;-nbsp; power supply (transmitter): DC12V

11)-nbsp;-nbsp; power supply (headphone):

-nbsp;

700mA/H rechargeable NI-MH battery

Helmet communication unit-Helmet Communication Unit KS-TG990

2010-3-4 14:05:48

-nbsp;

KS-TG990

FEATURES:

a．-nbsp;Enhancement of personnel safety

b．-nbsp;-nbsp;Free from influencing using of mask, helm, veil and other objective gear

c．-nbsp;You can speak and hear clearly even in strong noisy environment

d．-nbsp;Be waterproof, temperature resistant, acid-amp;alkali proof, is an ideal communication

tool when implementing special tasks, such as military application, law enforcement,

fire control, rescue and industry production, where you need to wear a helm.

SPECIFICATIONS:

Weight :-nbsp;85g

Sound-collector:-nbsp;-nbsp;-nbsp; Vibration sensor，noise is cancelled by 30Db

Speaker: 32 ohm-nbsp;

Cable: Spring wire(flame retardant): 4.2mm/380mm

Straight wire: (flame retardant): 4.2mm/750mm

Connector: Spring wire: Insertion Extraction Type of 5 cores

Straight line: spiral locker type of 6 cores

Working temperature:-nbsp;-25-hellip;+63℃(continuously)

Working voltage: 2,5-hellip;10,0 VDC

Humidity level:-nbsp;-nbsp; 95%RH,+63℃ 500 hours

Compatibility： All-nbsp;Kollson control/PTT unit

Earphones-MP3 Earphones KS-S680

2010-3-4 14:05:48

KS-S680
SPECIFICATIONS:
alanced Stereo Earphones
Speaker size: -Phi;10mm dia.dome
Frequency Response:20Hz to 20KHz
Impedence: 16-Omega;-plusmn;15%
Sensitivity: 94dB-plusmn;3dB(S.P.L at 1kHz)
Cord Length(mm):1350mm Plug(mm): -Phi;3.5mm

-nbsp;

Wireless headphones-Stereo Bluetooth Headphone KS-HB850

2010-3-4 14:05:48

Performance

Type :Stereo Bluetooth Headphone

Bluetooth Version:2.0V

Feasible distance:within 10m

Weight:67.8g

Calling time:12h

Enjoy music:10h

Standby time:200h

Chargring time:3-4h

Standard-nbsp; packing:1. Manual-nbsp; instruction

2.USB-nbsp; Cable-nbsp; 3.charger

Option-nbsp; accerssories:1Bluetooth-nbsp; dongle

-nbsp;

Earcushion-Sewing Ear pad E-098

2010-3-4 14:05:48

E-098

Sewing Ear pad

Specification:

108*81*15

Material:

Wet Process PU leather

Earcushion-Sewing Ear pad E-134

2010-3-4 14:05:48

E-134

Sewing Ear pad

Specification:

External diameter:66

Inner diameter-nbsp;:44

Opening:52

Thickness:14MM

Material:Yellow Velvet

Stereo headphones-Computer Headhpones KS-T390

2010-3-4 14:05:48

-nbsp;

KS-T390

SPECIFICATIONS:

Headphone:

Speaker Diameter: -Phi;40mm-nbsp;-nbsp;

Impedance: 32-Omega;

Sensitivity:108 dB-nbsp;-nbsp;-nbsp;-nbsp;-nbsp;

Frequency response:20-20KHz-nbsp;

Rated Power:100mW-nbsp;

Cable length: Approximately 2.5

Plug:3.5mm Stereo-nbsp;-nbsp;-nbsp;-nbsp;-nbsp;-nbsp;-nbsp;

Microphone:

Microphone directivity: Omni dire

Sensitivity:-58dB-nbsp;-nbsp;-nbsp;

Impedance:Low-nbsp;-nbsp;

Frequency response:30-1.6KHz

Stereo headphones-Computer Headphones KS-T560

2010-3-4 14:05:48

-nbsp;

KS-T560

Type::30mm Dynamic

Impedence:32 Ohm

Sensitivity:105dB-plusmn;4Db

Frequency response:50Hz-20KHz

Max power input:100Mw

Micphone:

Type: Electronic condenser

MIC: Omni direction

Sensitivity:-58dB-plusmn;-3dB

Frequency response: 50Hz-20KHz

Cable length 1.8m-plusmn;3%

Plug:3.5mm Stereo

Stereo headphones-Computer Headphones KS-T980

2010-3-4 14:05:48

-nbsp;

KS-T980

FEATURES:

1)-nbsp;-nbsp;-nbsp;-nbsp;-nbsp; unique design

2)-nbsp;-nbsp;-nbsp;-nbsp;-nbsp; OFC wire material

3)-nbsp;-nbsp;-nbsp;-nbsp;-nbsp; cavity on the leather makes it

SPECIFICATIONS:

Speaker ： -Phi;40mm

Sensitivity ： 108dB-plusmn;3db

Frequency Response ： 15Hz-20,000Hz

Impedance ： 32-Omega;-nbsp;

Rated Power ： 20Mw

Power Capability ：200mW

Cable Lengty ：2.3m-plusmn;0.15m

Plug Type ：ф3.5mm-nbsp;stereo

Noise cancelling headphones-Noise Cancelling Earphones KS-SJ980

2010-3-4 14:05:48

-nbsp;

KS-SJ980

FEATURES:

1)-nbsp;-nbsp;-nbsp;-nbsp;-nbsp; beautifull outlook

2)-nbsp;-nbsp;-nbsp;-nbsp;-nbsp; unique packing

3)-nbsp;-nbsp;-nbsp;-nbsp;-nbsp; two layers of noise cancelling ---active and passive

SPECIFICATIONS:

Speaker element: 10mm

Magnet: Neodymium

Sensitivity: 110+ 3db /mW at 1KHZ

Impedance: 32-Omega;

Frequency range : 20-20Khz

Rate power: 20Mw

Power capacity: 40mW

Active cancellation : up to 18-20db cancellation between 150-400Hz

Power: 1.5V power

Cord Length : 1.5m single wire

plug: 3.5mm

Earphones-Wooden Earphones KS-SM990

2010-3-4 14:05:48

-nbsp;

KS-SM990

FEATURES:

1)-nbsp;-nbsp;-nbsp;-nbsp;-nbsp; pure wooded material

2)-nbsp;-nbsp;-nbsp;-nbsp;-nbsp; natural hearing effect

3)-nbsp;-nbsp;-nbsp;-nbsp;-nbsp; beautifull outlook

SPECIFICATIONS:

Material: maple wood

Driver:-nbsp;-phi;13mm neodymium magnet

Sensitivity:-nbsp;104-plusmn;3dB/Mw

Frequency Response: 18-21000Hz

Maximum Input: 5mW

Impedance: 32-Omega;

Plug: -phi;3.5mm stereo mini plug

Cable Length: Approx. 120cm (Y-style)

Weight (w/o cable): Approx. 6g

Earphones-Wooden Earphones KS-SM980

2010-3-4 14:05:48

-nbsp;

KS-SM980

FEATURES:

1)-nbsp;-nbsp;-nbsp;-nbsp;-nbsp; pure wooded material

2)-nbsp;-nbsp;-nbsp;-nbsp;-nbsp; natural hearing effect

3)-nbsp;-nbsp;-nbsp;-nbsp;-nbsp; beautifull outlook

SPECIFICATIONS:

Material: Rose wood

Driver:-nbsp;-phi;10mm neodymium magnet

Sensitivity:-nbsp;94-plusmn;3dB/Mw

Frequency Response: 18-21000Hz

Maximum Input: 5mW

Impedance: 32-Omega;

Plug: -phi;3.5mm stereo mini plug

Cable Length: Approx. 120cm (Y-style)

Weight (w/o cable): Approx. 6g

Wireless headphones-Wireless Headphones KS-TW370

2010-3-4 14:05:49

-nbsp;

KS-TW370

FEATURES:

FM Radio Broadcast

Online Chat

Wireless or wired headphone

Suitable for sound receiving from electronic

products with audio output suchasTV,computer,DVD -amp; VCD

SPECIFICATIONS:

Speaker: 27mm

Impedance: 32Ohms

Frequency Response:-nbsp;20Hz-20KHz

Sensitivity:-nbsp;102Db

Transmitting frequency: 83-108MHZ-nbsp;

Max receiving range: 30m

Power supply: AAA DC 1.5V batteries 2pcs

Earphones-MP3 Earphones KS-S110

2010-3-4 14:05:49

-nbsp;

KS-S110

SPECIFICATIONS:

Type: Stereo earphone

Frequency Response:20Hz-20000Hz

Sensitivity:108db S.P.L at 1KHz

Impedence:32ohm

Rated power:3Mw

Max power:20Mw

Speaker diameter: 10mm、6u

Cord length:115-120cm

Plug:3.5mm

-nbsp;

Neckband headphones-Computer Headphones KS-H260

2010-3-4 14:05:49

-nbsp;

KS-H260

SPECIFICATIONS:

Earphone parameter:

Speaker size: -Phi;30mm

Impedance:16-Omega;-nbsp;-nbsp;-nbsp;

Sensitivity:108dB-nbsp;-nbsp;

Frequency response : 20-20000Hz

Max power input:30m

Plug: -Phi;3.5mm Stereo

Microphone parameter:

Type: Condenser type

Sensitivity:-54dB-nbsp;-nbsp;

Frequency response： 20-20000Hz

Plug: -Phi;3.5mm Stereo

Cable length:1.8m-nbsp;

Earphones-MP3 Earphones KS-S250

2010-3-4 14:05:49

-nbsp;

KS-S250

SPECIFICATIONS:

Speaker diameter:-Phi;15

Impedence:32-Omega;

Speaker Sensitivity:110-plusmn;3dB-nbsp;

Frequency response: 20-20K HZ-nbsp;

Max power: 10MW

Stereo headphones-Computer Headphones KS-T670

2010-3-4 14:05:49

-nbsp;

KS-T670

1)-nbsp;-nbsp;-nbsp;-nbsp;-nbsp; durability

2)-nbsp;-nbsp;-nbsp;-nbsp;-nbsp; four colors are available

3)-nbsp;-nbsp;-nbsp;-nbsp;-nbsp; convenient volume control on the wire

4)-nbsp;-nbsp;-nbsp;-nbsp;-nbsp; the earpad is easy to change

SPECIFICATIONS:

Type::40mm Dynamic

Impedence:32 Ohm

Sensitivity:105dB-plusmn;4Db

Frequency response:50Hz-20KHz

Max power input:100Mw

Micphone:

Type: Electronic condenser

MIC: Omni direction

Sensitivity:-58dB-plusmn;3dB

Frequency response: 50Hz-20KHz

Cable length 1.8m-plusmn;3%

Plug:3.5mm Stereo

Neckband headphones-Computer Headphones KS-H550

2010-3-4 14:05:49

-nbsp;

KS-H550

1）portable : Unique design with three-step folding

packing in a-nbsp;plastic clear-nbsp;box

2）it is a sports earphone

good for excerising outside and sports lover

3）material: TPE cord

-nbsp;-nbsp; plastic part : soft plastic rather than ABS

4）without any gluewater , completely green

-nbsp;-nbsp; but with high frequency technic

SPECIFICATIONS:

1）Driver unit：30mm 6U

2）Impedance：32-Omega;

3）Sensitivity：105dB土3Db

4）Frequency response ：20Hz--20KHz

5）Cord Length：TPE 1.2m

-nbsp;

Foam series-Foam series F-8009

2010-3-4 14:05:49

F-8009

Specification:

Φ18*7*H3

Foam series-Foam series F-8011

2010-3-4 14:05:49

F-8011

Specification:

-Phi;50*thickness:5MM:with

adhesive plaster at the back

-nbsp;

Foam series-Foam series F-8020

2010-3-4 14:05:49

F-8020

Specification:

35*32*-Phi;16*4*6

-nbsp;

Foam series-Foam series F-8006

2010-3-4 14:05:49

F-8006

Specification:

-Phi;53*35*H70

-nbsp;

Foam series-Foam series F-8023

2010-3-4 14:05:49

F-8023

Specification:

47*-Phi;22*-Phi;10

-nbsp;

Earplug-Earplug S-3027

2010-3-4 14:05:49

S-3027

Specification:

H33 Round botton

Earplug-Earplug S-3029

2010-3-4 14:05:49

S-3029

Specification:

-nbsp;-nbsp;bell mouth-nbsp;: -Phi;18*H23

-nbsp;-nbsp;-nbsp;-nbsp;-nbsp; cylinder: H18*-Phi;5

Earplug-Earplug S-3031

2010-3-4 14:05:49

S-3031

Specification:

-nbsp;-nbsp;String length:60CM

Earplug-Earplug R036

2010-3-4 14:05:49

R036

-nbsp;PU Ear plug

Sticks with silicon get

Earplug-Earplug R051

2010-3-4 14:05:49

R051

-nbsp;PU Ear plug

-nbsp;Specification:

-Phi;12*-Phi;5*H13

Earplug-Earplug R053

2010-3-4 14:05:49

R053

-nbsp;PU Ear plug

-nbsp;Specification:

-Phi;14*H25

Earplug-Earplug R057

2010-3-4 14:05:49

R057

-nbsp;PU Ear plug

-nbsp;Specification:

Oval botton

Earplug-Earplug R061

2010-3-4 14:05:49

R061

-nbsp;PU Ear plug

-nbsp;

Earplug-Earplug R062

2010-3-4 14:05:49

R062

-nbsp;PU Ear plug

-nbsp;

Earplug-Earplug R063

2010-3-4 14:05:50

R063

-nbsp;PU Ear plug

-nbsp;

Eartips-Eartips S-3017

2010-3-4 14:05:50

S-3017

Specification:

-nbsp;

-Phi;15*H5

Eartips-Eartips S-3025

2010-3-4 14:05:50

S-3025

Specification:

-Phi;18*-Phi;5*H15

Eartips-Eartips S-3021

2010-3-4 14:05:50

S-3021

Specification:

-Phi;20*-Phi;18*H5

Eartips-Eartips S-3015

2010-3-4 14:05:50

S-3015

Specification:

-nbsp;

-Phi;18*-Phi;5*H15

Eartips-Eartips S-3009

2010-3-4 14:05:50

S-3009

Specification:

-nbsp;

-Phi;12*-Phi;7*H8

Eartips-Eartips S-3008

2010-3-4 14:05:50

S-3008

Specification:

-nbsp;

-Phi;15*-Phi;6*H8 L

-Phi;12*-Phi;6*H8 M

-Phi;8*-Phi;6*H7-nbsp; S

Earcushion-Sewing Ear pad E-097

2010-3-4 14:05:50

E-097

Sewing Ear pad

Specification:70*14

Material:PU Leather

Earcushion-Sewing Ear pad E-102

2010-3-4 14:05:50

E-102

Sewing Ear pad

Specification:

102*73*75

Material:

Super Soft leather (Protein leather)+Sponge

Earcushion-Sewing Ear pad E-114

2010-3-4 14:05:50

E-114

Sewing Ear pad

Specification:

98*88*17

Material:Flannel

Earcushion-Sewing Ear pad E-118

2010-3-4 14:05:50

E-118

Sewing Ear pad

Specification:

55*13

Material:

Grey PU leather

Earcushion-Sewing Ear pad E-131

2010-3-4 14:05:50

E-131

Sewing Ear pad

Specification:

External diameter:89*75

Inner diameter-nbsp;:59*44

Opening:80*74

Thickness:15MM

Material:Red Velvet

Earcushion-Sewing Ear pad E-133

2010-3-4 14:05:50

E-133

Sewing Ear pad

Specification:

External diameter:66

Inner diameter-nbsp;:44

Opening:52

Thickness:14MM

Material:Yellow Velvet

Earcushion-Sewing Ear pad E-138

2010-3-4 14:05:50

E-138

Sewing Ear pad

Material: LD PVC Leather

Earcushion-Sewing Ear pad E-144

2010-3-4 14:05:50

E-144

Sewing Ear pad

Material: PU leather

Technics:Molded PU Foam

Headphones - Different Types and Functionality

2009-8-16 22:47:30

Headphones are described as a pair of tiny loudspeakers enabling an enhanced music hearing experience. They are often available in pairs and very rarely as a single entity. They are marketed as earphones, ear buds, stereo phones or headsets. A peek into its history: Its inception dates back to the early twentieth century when telephone earpiece was developed into the precursor of the modern day device. The earlier ones however, worked on the moving iron drivers; either single ended or balanced armature. Types of headphones: Depending on their appearance and functionality they may be categorized into the following types: * Circumaural: Headphones with a circular ear pad that surrounds the ear. * Supra-aural: Made functional with pads that sit atop the ears and not around it. * In-ear: They are of smaller size and can be placed directly outside the ear canal. * Canalphones: Known as 'in ear monitors' they are inserted directly into the ear canal. The headphones may be used depending on the functionality, with fixed equipments such as home theater, CD or DVD players, computers and other portable devices like digital audio player/mp3 player and mobile phone. Although headphones have become an integral part of a music aficionado's life, it is important to know that not all of them are suited for you. Consider the applications, properties of the various types and then zero in, on the one most suitable for you. The article provides a brief over-view of the different types. Weigh your options and choose them right, for an enhanced music hearing experience.

Technology

2009-8-4 1:05:19

Headphone transducers employ one or more of several methods of sound reproduction. Moving-coil The moving coil driver, more commonly referred to as a "dynamic" driver is the most common type used in headphones. The operating principle consists of a stationary magnetic element affixed to the frame of the headphone which sets up a static magnetic field. The magnetic element in headphones is typically composed of ferrite or neodymium. The diaphragm, typically fabricated from lightweight, high stiffness to mass ratio cellulose, polymer, carbon material, or the like, is attached to a coil of wire (voice coil) which is immersed in the static magnetic field of the stationary magnet. The diaphragm is actuated by the attached voice coil, when an audio current is passed through the coil. The alternating magnetic field produced by the current through the coil reacts against the static magnetic field in turn, causing the coil and attached diaphragm to move the air, thus producing sound. Modern moving-coil headphone drivers are derived from microphone capsule technology. A typical moving-coil headphone transducer Electrostatic Electrostatic loudspeaker diagram Electrostatic drivers consist of a thin, electrically charged diaphragm, typically a coated PET film membrane, suspended between two perforated metal plates (electrodes). The electrical sound signal is applied to the electrodes creating an electrical field; depending on the polarity of this field, the diaphragm is drawn towards one of the plates. Air is forced through the perforations; combined with a continuously changing electrical signal driving the membrane, a sound wave is generated. Electrostatic headphones are usually more expensive than moving-coil ones, and are comparatively uncommon. In addition, a special amplifier is required to amplify the signal to deflect the membrane, which often requires electrical potentials in the range of 100 to 1000 volts. Due to the extremely thin and light diaphragm membrane, often only a few micrometers thick, and the complete absence of moving metalwork, the frequency response of electrostatic headphones usually extends well above the audible limit of approximately 20 kHz. The high frequency response means that the low midband distortion level is maintained to the top of the audible frequency band, which is generally not the case with moving coil drivers. Also, the frequency response peakiness regularly seen in the high frequency region with moving coil drivers is absent. The result is significantly better sound quality, if designed properly. Electrostatic headphones are powered by anything from 100v to over 1kV, and are in proximity to a user's head. The usual method of making this safe is to limit the possible fault current to a low and safe value with resistors. Balanced armature Balanced armature transducer with armature balanced and exerting no force on diaphragm Balanced armature transducer with armature torqued and exerting a force on diaphragm A balanced armature is a sound transducer design primarily intended to increase the electrical efficiency of the element by eliminating the stress on the diaphragm characteristic of many other magnetic transducer systems. As shown schematically in the first diagram, it consists of a moving magnetic armature that is pivoted so it can move in the field of the permanent magnet. When precisely centered in the magnetic field there is no net force on the armature, hence the term 'balanced.' As illustrated in the second diagram, when there is electric current through the coil, it magnetizes the armature one way or the other, causing it to rotate slightly one way or the other about the pivot thus moving the diaphragm to make sound. The design is not mechanically stable; a slight imbalance makes the armature stick to one pole of the magnet. A fairly stiff restoring force is required to hold the armature in the ‘balance’ position. Although this reduces its efficiency, this design can still produce more sound from less power than any other. Popularized in the 1920s as Baldwin Mica Diaphragm radio headphones, balanced armature transducers were refined during World War II for use in 'sound-powered' telephones for military use. Some of these achieved astonishing electro-acoustic conversion efficiencies in the 20% to 40% for narrow bandwidth voice signals. Today they are typically used only in canalphones and hearing aids due to their diminutive size and low impedance. They generally are limited at the extremes of the hearing spectrum (16kHz) and require a seal more than other types of drivers to deliver their full potential. Higher end models may employ multiple armature drivers, dividing the frequency ranges between them using a passive crossover network. Some combine an armature driver with a small moving-coil driver for increased bass output. Orthodynamic Orthodynamic, isodynamic or magnetostatic drivers, are either composed of a thinly pressed disc made of tightly coiled fine aluminium wire affixed to a mylar sheet or of a printed circuit. This disc is the diaphragm. The diaphragm is then sandwiched between two magnets which have the same polarity facing each other. As a result the magnets repel from each other and so the whole assembly is clamped together. An electrical signal is passed through the disc as it would be through the voice coil of a moving coil driver and the motion produced generates the sound. Once a popular choice for manufacturers such as Yamaha for their headphones, the technology has fallen generally into disuse as companies increasingly favour moving-coil designs. Fostex though, continues to manufacture orthodynamic headphones

Types of headphones

2009-8-4 1:00:56

Types Earcup headphones There are many different types of headphone designs, with the listening situation and the needs of the listener determining what type of headphone will be used. Generally, headphone formfactors can be divided into four separate categories: circumaural, supra-aural, earbud, and in-ear. Earcup headphones Earcup or on-ear headphones rest on the exterior of the ear and were the earliest headphone form designed. The housing, or earcup, of an earcup headphone will be either open or closed. Open headphones, sometimes marketed as “open air” headphones, have an open grille on the back of the earcup, exposing the driver to the outside and allowing sound waves to propagate away from the ear freely. This backing type does not isolate the listener from outside sounds; in addition, sound through open headphones can be heard by others in the vicinity of the user. They usually have less distortion due to the lack of earcup resonance. Closed headphones have a sealed backing, which attenuates sound waves propagating away from the ear. As a result, listeners away from the headphones cannot hear the produced sound easily. In addition, sound from outside is attenuated by the sealed backing, providing a level of isolation to the listener. A sealed chamber is often claimed to have the negative effect of distorting sound in certain frequencies due to resonances within the earcup housing, however, bass frequencies are stronger in a sealed chamber headphone design. Circumaural Circumaural headphones (sometimes called full size headphones) have circular or ellipsoid earpads that completely surround the ears. Often circumaural headphones are noise-isolating and sealed, but many are not. Because the earpads must enclose the ear, circumaural headphones are often larger in size and tend to weigh more, making them somewhat less portable, but their size also allows for a larger driver. This type of headphone is commonly used in recording studios and by audio enthusiasts. Circumaural headphones have large pads that surround the outer ear. A pair of supra-aural headphones Earbuds Earbuds or earphones are headphones of a smaller size that are placed directly outside of the ear canal, but without fully enveloping it. They are generally inexpensive and are favored for their portability and convenience. However, due to their inability to provide isolation, they are not capable of delivering the same dynamic range offered by many full-sized headphones and canalphones for a given volume level. As a result, they are often used at higher volumes in order to drown out noise from the user's surroundings, which increases the risk of hearing-loss.[2] During the 1990s and 2000s, earbuds became a common type bundled with personal music devices. Earbuds or earphones, such as these that ship with the Apple's iPod, rest in the outer part of the ear canal.

Headphones History

2009-8-4 1:11:38

Headphones are a pair of small loudspeakers, or less commonly a single speaker, with a way of holding them close to a user's ears and a means of connecting them to a signal source such as an audio amplifier, radio or CD player. They are also known as earphones, earbuds, stereophones, headsets or, informally cans. In the context of telecommunication, the term headset is used to describe a combination of headphone and microphone used for two-way communication, for example with a telephone. History Old telephone earpiece Brandes radio headphones, circa 1920 The telephone earpiece such as the one pictured at the right was common around the turn of the 20th century. From the earpiece developed the headphones. Sensitive headphones were the only way to listen to audio signals before amplifiers were developed.[1]