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speaker box's type and performance index (two)

Second, loudspeaker system performance indices1) Frequency Response (valid frequency range)This indicator reflects the work of the main frequency range of speakers. When the signal source to the speaker to be constant pressure to change by the low-frequency to high-frequency signal source frequency, the speaker will be produced by sound pressure varies with frequency. The resulting sound pressure - frequency curve, that is, the speaker frequency response curve. IEC (International Electrotechnical Commission) provides the frequency of the sound speakers can replay the boundaries, that is, the effective frequency range, is to take speaker sound pressure frequency characteristic curve in the vicinity of a multiplier bit more than the peak, the average sound pressure level to reduce the frequency range of 10dB. This range, the wider the better burst characteristics ofGeneral high-fidelity loudspeaker frequency response of the minimum requirements for the speaker box 50-12500HZ (+4 ~-8dB), can reach 50-16000Hz enough for me. Of course, 30-20000Hz even better.2) Rated impedanceIt means the speaker in a particular operating frequency (IF) when measured input impedance. Mark plate is normally marked on the product from the production plant is given. Speaker impedance. From production plants rated for resistance is usually given at the rated power frequency range is expected to get the maximum value of the impedance mode. Nominal Impedance 4 General provisions in Europe, eight in Europe, 16 in Europe, 32 European and so on, there is also three foreign countries in Europe, 6 and European.3) powerSpeakers choose to use the power of size is an important indicator of the speaker. Should be noted that domestic and foreign speakers, standard method are very different, it is because the definition of power to explain different. General speaker of the nominal rated power.Rated power or rated noise power, is the speaker able to produce prolonged periods of continuous work without abnormal sound when the input power. General test used pink noise signal through specific filters, at rated frequency range for testing. According to IEC standards, measured speaker should ensure that 100 hours of continuous work, does not produce an exception. Incidentally, the U.S. EIA standard provides test time of 8 hours, but filters are also different.Maximum noise power and the rated power is different from speaker to withstand a short time it is an indication of a large input power capacity, the test time is only a few seconds or minutes. Maximum noise power is generally 2-4 times the rated power.4) SensitivityCharacteristic sensitivity is rated as the equivalent impedance on the speaker with 1W power pink noise signal voltage in the axial direction of the sound pressure level measured at 1m. Speaker Box sensitivity and efficiency are two different concepts, efficiency is the output sound power ratio of the input electrical power, but generally high sensitivity and efficiency of the speaker box is higher.A speaker's sensitivity level of the sound playback is not a decisive influence, because people can adjust the output of amplifier to get sufficient volume. However, production in the speaker, speaker sensitivity is a worthy argument. Because in the two-way or three-way speakers, each speaker unit is responsible for playback in their band, their sensitivity must be basically the same, so that the speakers in the playback of high, medium, bass balance. Especially for stereo speakers, left and right channels to use



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