【 Weak current College 】 audio in English nouns (yinxianglei)---Power By 【 China power house network 】

Input power (inputpower): as a speaker in the cell under power (power), and they have rated power (rms). , The largest bear power (program) and peak power (peak). Which the rated power is the most accurate data input power, the other two names just indicates that the speaker instantly load capacity, not much practical significance.

Impedance (impedance): speaker cell impedance 4 ohm, generally, 8-ohm and 16 ohm, NEXO exceptions, using 12 ohm 6 ohm 3 ohms. Actual multimeter test, measured not speaker impedance, DC resistance, General 8 Ohm impedance, DC resistance of sound is approximately 6-7 ohm.

Frequency range (frequencyrange): speakers can play the frequency range, generally indicate that conditions are at-3 DB to test, for example, 50-18000Hz @-3dB, there are also some speakers is 10 DB of-, for example, 50-18000Hz @-10dB,-3 DB test than-10 DB test more accurate, the former frequency response range is wider than the latter. In General, frequency response range of the speaker, the sound quality is better, but with a-10 DB conditional nominal frequency range sometimes looks very wide, if you use-3 decibels measured conditions, narrower plenty.

Sensitivity (sensitivity): Speaker input 1 watt of power, at a distance of 1 metre from the speaker system, speaker cannot be given the size of the sound pressure level, such as 100dB/1w.1m, said the speaker in input 1 Watt power, distance from the speaker distance of 1 metre, the resulting sound pressure level is 100 DB. Sensitivity on behalf of the speaker put power into sound power efficiency, sensitivity is about, this efficiency is higher, the sensitivity low sound impression is "eat power." Comparison of the two speakers, if a difference of 3 DB sensitivity, high sensitivity of the speaker of the lower efficiency than sensitivity that only twice, the same power input, the high sensitivity of the speaker sounds louder. General professional speaker sensitivity about 95-105 DB.

Maximum sound pressure level output and peak sound pressure level output (SPLmaxandSPLpeak): indicates that the speaker when the input maximum power, distance 1 m distance from the speaker emits the sound pressure level, such as the maximum sound pressure level 130 DB means the speaker full power input at 1 m distance can produce 130 DB sound pressure level. Peak sound pressure level output is the speaker in a short time withstand peak input power (usually rated input power of 4 times), in a m distance resulting sound pressure level output. Maximum sound pressure level indicator represents the capacity of actual output sound box, a comparison of the two speakers, the maximum sound pressure level if a difference of 3 DB, then the output of a comparison with another double, one of the top two. General common professional speaker output of the maximum sound pressure level is mostly in the 120-140 decibels. More than 130 decibel output capacity of sound pressure can be called a loud speaker system.

Crossover point (crossoverpointorX-over): composed of several modules of all audio speaker internal, HF, MF and LF unit work in different respectively between the band, the band cross combination of parts of the frequency is the frequency frequency, also called a crossover point. For example, a fractional second frequency speaker is 1800 Hz, that is, the speaker internal bass unit operating frequency in 1800 Hz, and frequency of the treble unit in more than 1800 Hz, crossover point settings according to the unit's features and requirements for quality. If you use an active frequency divider in electronic crossover point on not to adjust, or easily burn unit.

Active crossover and passive crossover (bi-ampandpassiver): active frequency, also called external crossover (active crossover), is the speaker does not have the internal unit with divider, but external electronic sound divider will all audio signals into high and low two frequency bands or high low three frequency bands, and then tap OK band signals sent to separate amplifier, then a separate amplifier driving the corresponding driver. Passive crossover is common speaker internal way with divider is also called the built-in frequency or passive crossover is to adopt a passive speaker internal divider to power broadcasting to all audio signals into high-frequency signal to high-frequency cell, put out by the low frequency band signal to the low frequency range. Both frequency division's goal is the same, but the results are very different, active crossover can get distortion lower, the effect of the loss of smaller, passive frequency due to loss and interference, generally only as an economic product, but some speakers can switch the active or passive crossover model, suitable for different requirements and budgets of customers.

Coverage (dispersionHxV): also known as directed, usually indicates that the speaker output sound pressure level in the horizontal and vertical axis direction compared with 6 DB of attenuation, the speaker can overwrite the angle, in General, the more narrow the coverage, the smaller the sound coverage, transmission distance farther and wider coverage, larger coverage loudspeaker, transmission distance, the more recent, like the searchlight and astigmatism lights (such as sites of tungsten iodine lamp tube) concept.