What is HI-Fi speaker? Everyone actually understands this, which is what we call high-fidelity speakers. But do you know the actual Hi-Fi speaker technical standards? This standard is established by the International Electrotechnical Commission (IEC). As long as we look at the speaker's manual to see whether its technical parameters meet this lower standard, we can objectively determine whether the speaker is qualified. Some of the lower standards for Hi-Fi speakers are:

　　Pointing characteristics: horizontal plane ±30?o, vertical plane ±10?o, the deviation of frequency response curve compared with the positive axis is ≤±4dB;

　　Total harmonic distortion: 250Hz～1kHz, ≤2%, 1Hz～2kHz, ≤1%-2%, 2kHz～6.3kHz, ≤1%;

　　Impedance: in the range of 20Hz～20kHz, ≥80% of the rated impedance;

　　Frequency characteristics: at 50Hz-12500Hz, the deviation is within +4～8dB; within the frequency band of 100Hz～8kHz, the deviation is ≤±4dB;

　　The inconsistency of the left and right channel speakers: the difference of the average sound pressure in the range of 250Hz～1kHz≥2dB;

　　From the above standards, it is not difficult to see that the technical requirements of the (high-fidelity) speakers that meet the IEC Hi-Fi standard are not very high. Now the speakers produced by the regular manufacturers on the market can basically meet or exceed these standards. So in these many qualified products。