【 Weak current College 】 designations for electro-acoustic devices, speakers, speaker key features parameter 】

Electro-acoustic devices are converted to electric and acoustic device, it is the use of electromagnetic and electrostatic induction or piezoelectric effect to complete audio conversion, including speakers, headphones, microphones, changtou, etc.
1. designation
Designation of the composition of the project and order
Speaker: Lord says-classification-radiation forms-shape-power-ordinal
Microphone: master called-category-level-ordinal
Sent, the receiver: main says-classification-ordinal-impedance
Microphones, headphones: main says-ordinal-impedance
Assemblies: the main says-ordinal-group forms
The master stated that the name and the symbols in the corresponding relations: speakers-Y, speakers, group-YZ, Fu's poetry Cafe, microphone-C, microphone group-CZ, mouthpiece-O, receiver-S, cylinder-H, headphone-E, headphone cylinder group-EH.
Classification name and symbol correspondence: electromagnetic-C, electric, moving coil-D, piezoelectric-Y, static, capacitive-R, carbon particle type-T, aluminum belt-A, touch-J, pressure differential-pressure-C,-not to say that.
Radiation forms, shapes, use the name and the symbols in the corresponding relations:, drum-H, oval-T, circle-not, correspond-S, aircraft call Cap-F, tanks used call Cap-T CAP, ships call-J, General work with call Cap-G. Second, the speaker categories
The speaker is the current audio is converted into sound of electro-acoustic devices, speakers, commonly known as the Horn, great variety.

Classification by way of energy: electric (lap) speaker, electromagnetic speaker, static (capacitive) speaker, piezoelectric
(Crystal) speaker, discharge (ion) speakers.
According to the radiation pattern classification: Cone (direct radiating) speaker, Horn (indirect radiating) speakers.
Classification by diaphragm forms: paper cone speakers, ball-shaped speakers, speakers, flat belt-driven by the speakers.
By composition classification: single cone speakers, combo cone speakers, combination Horn loudspeakers, coaxial composite Yang
Sound device.
Classified by use: high definition (household) speakers, listen to speakers, PA speakers, musical instruments used
Speaker, receiver mini speakers, speakers in water.
By: overall classification: round speaker, oval-shaped speakers, cylindrical speakers, rectangular speakers. Three main parameters, speaker

1. nominal power
Nominal power also known as the rated power or not distortion power, it is a nonlinear distortion does not exceed the standard conditions (typically no more than 7-10%) of maximum input power. Speakers at the normal power under long-term work should not be damaged.
2. nominal impedance
Factory product standards by impedance values, in the impedance of the speakers to get the most power.
3, the resonance frequency
Speaker input impedance is the change of frequency, the speakers in a low-frequency danmou, frequency input impedance of chasing the most, this frequency is called resonance frequency fo, resonant frequency and speaker vibration system, the higher the vibration system quality, cone folding ring, centering force more soft, its slice of resonant frequency the more low.
4. sensitivity
When you enter the speaker's power to 1W, axis a metres measured average sound pressure.
5. directivity
Speakers in different directions of tone of the radiation was different, that this kind of performance indicators called radiation directivity, relevant to the sexual and the frequency of radiation, loudspeaker directivity and enhanced increasing frequency, usually in the 250-300Hz following, there is no clear direction.