The first dynamic range
What is the dynamic range it? It refers to the provisions under no circumstances distortion index, SPL strongest weakest tone horn tone is poor, its measurement unit is dB. Dynamic range as widely as possible, because if your speakers a dynamic range wider than the others speakers, then the speaker on the others can not hear the music details on your speakers detailed manifested. When the sound levels are similar, wide dynamic range of the speaker who, who sound like, this is an indisputable laws.
Second impedance
Nominal impedance speaker refers to speakers at a particular frequency, the impedance of the coil ends of the value of its presentation, you can get maximum power the speaker to run on this impedance value. Speaker impedance value common in Europe, such as several major 4,5,6,8,16, at the time of purchase to pay attention to the speaker's impedance value not less than the impedance value card or amplifier, the two should be the same as or greater than the sound card. As for the sound card output impedance values do not understand, can also be used as 8 ohms impedance speaker can be, the most widely used to adapt to it.
Third pure tone
Pure tone is also an important indicator to judge the quality of the horn. Pure tone means within the rated power and rated frequency range, to weep speaker plus positive signal of a certain frequency, the speaker should be no mechanical noises, sound and touch ring rubbish sound. Especially for those rough small factories or small workshop production of speakers, the produce impure timbre is its universal phenomenon, we need to pay attention at the time of purchase, and use this quality speaker playback quality of its necessarily bad . The reason is the adverse pure tone horn work well, such as the cone pressure side, damper bonding is not strong; Penjia magnetic board connection is not strong; the voice coil, dust cover bonding is not strong; the voice coil deformation placing errors; there are iron or dust, etc. in the magnetic gap.
IV. Distortion
It refers to a non-linear distortion. It consists of harmonic distortion, intermodulation distortion and transient intermodulation distortion categories. Wherein harmonic distortion is added to the sound playback means higher harmonic components of the original signal is not caused by distortion, harmonic distortion so generated mainly at low frequencies, especially at the resonant frequency of the most obvious. The intermodulation distortion effects to the main aspect is the sound tones.
Transient intermodulation distortion is introduced in the low-frequency amplifier stage zoom or compensating capacitor at the amplifier input pulse signal, because of the capacitance of the negative feedback delay occurs, so that the momentary overload the input stage to produce transient intermodulation distortion, it seriously affecting the quality of playback sound reduction. So it is even more important in the speaker and the speaker system, it is closely related to the quality indicators and speakers. Often expressed as a percentage, a lower number indicates less distortion. Ordinary speaker distortion should generally be less than 0.5 percentage points, while the subwoofer speakers like to be less than 5 percentage points.
V. Nominal power
That is the rated power, which is the normal operating power horn, trumpet and only long-term work and avoid being damaged in this condition. This one will involve a maximum peak power input [maximum allowable input power] issue, it refers to the speaker can withstand the maximum power. As countries and major audio manufacturers to power the definitions and standards, these values will have a big difference, we need to pay attention at the time of purchase, according to the provisions of the maximum power the speaker can not exceed its nominal power of 1-2 times. However, some imported speaker is not necessarily so. There is some manufacturers prefer to peak power rating is listed as a speaker, he does not just believed that "known as" the 300W, 500W rated power value, even if they can reach 10W very great. There is a selection of the speaker of its nominal power level best not to sound serious or less than the output power amplifier.
VI. Frequency
When the input of the speaker is added at a constant voltage, the sound pressure level at a point axially speaker will vary with frequency relationship is called the frequency response. It is an important indicator of the speaker, if the horn to points, usually low-frequency speaker frequency range between 20Hz-3000Hz; IF speaker frequency range 500Hz-5000Hz between, and the high-frequency speaker frequency range in the 3000Hz- between 20000Hz. But not to say that the speaker can achieve such frequency response, the speaker will have a frequency response of such indicators, the quality of it and the speaker, the speaker of workmanship and materials have great light system. Today's an excellent speaker whose frequency range is generally up between 60Hz-20000Hz. As for some low-end speakers is difficult to achieve more than nominal value, we do not believe at the time of purchase.