Introduction of Earphone 

Specification:

Receiver Diaphragm: 6u, 9u and 12u are usually used in the thickness of the diaphragm. The thinner the diaphragm is the higher quality of the sound is, and the price is higher as well.
Rated Input Power: For normal operating.
Impedance: The direct current resistance is measured by ammeter. 16, 28 and 32 ohm are often seen.
Channel Balance: The difference of SPL between the left and right side on 1000Hz. Sensitivity (S.P.L.): The sensitivity is measured by decibel meter in the distance of 10cm.

Pulg:The 3.5phi plugs usually apply to MP3 and CD player; the 2.5phi plugs apply to cell phone and PDA. If add the microphone function, there will be one more section but the total length is the same.
Parallel Capacitance: The capacitance is for filtering the unnecessary noise signal.

How to choose:

Monotype: We can often see the diameters of 10, 13, 15 and 16 phi, and the diaphragm of 6u, 9u and 12u.
Casing: The plastic case is the most popular; there are also some high price earphones made from aluminum and titanium.
Wire: The main material is PVC, and there are many different types of ropes to choose; the length of 1.2M and 1.4M is popular. A good wire performs well in tension test and is able to bear the numbers of twists.
Microphone: It is able to assemble a microphone on the wire with a switch.
Volume control: Assembling another resistance to control the volume.
Plug: Diameter: 2.5, 3.5, 6.0 phi. 2-4 sections are possible. There are nickel-plating and gold-plating to choose. Angle: 90, 135, or 180 degree.
Package: The earphones are bound with cable tie in a plastic bag, or OEM pasteboard package.
Color: Normally the colors are black, white, silver and gray. We also provide color sample for special requirement, but have minimum order quantity.