In the general problem of the equipment in the audio system, if the connection is improper, the light will reduce the system indicators and generate noise. In severe cases, the equipment cannot work normally. The following points should be done when connecting:

Impedance matching: In the audio system, almost all equipment uses a cross -connection method, that is, the output impedance design of the device is very small, and the input impedance is large. This is because in the system, unless the signal is transmitted long -distance transmission, it is generally treated as a short -term processing. And the signal level bottom, the signal is required to transmit high quality, and the change of the load basically does not affect the quality of the signal.

When the signal source is designed to a constant voltage source, or the load is far greater than the internal impedance of the signal source, the above requirements can be met. In fact, the impedance of professional audio equipment is designed in accordance with the above principles. The device interconnection is adopted by a cross -connection method. This is the impedance matching of the audio equipment.

In the design of the sound expansion system, the impedance problem is generally not necessary. However, when the output of a device needs to be connected to multiple devices, that is, a signal source driver several loads must be used to meet the requirements of the device impedance matching (if two devices, if two devices, if two devices are two devices, Generally and at the output end of the pre -level device).

The amplifier and speakers are connected according to the output impedance of the nominal output and the input impedance of the speaker. There are two types of power amplifiers: 4Ω and 8Ω, you can connect 4Ω speakers or 8Ω speakers. When connecting the 4Ω speaker, the power amplifier's output power is larger than 8Ω. Two 8Ω speakers can be connected to the amplifier output end, which is 4Ω working.