When connecting audio equipment should pay attention to what the problem

Acoustic equipment all levels of between matches meets is more important. If connection not, when not only will affect equipment's replay effect, will damage the equipment. the 1. equipment connects essential requirements: (1) signal level match: when connects the acoustic equipment certainly must pay attention to between various equipments' input, the output signal level difference. If before, the level equipment input signal's level is oversized, will have the nonlinear distortion, will otherwise descend the reproducing system's signal-to-noise ratio, will be unable under the impetus the first-level equipment's amplifier, therefore when will match will meet must pay attention to between equipment's level not should the phase difference to be oversized. If presents the signal level ill timing in the actual use, must make the input through the damping circuit the signal level to reduce, or causes the input signal through the amplifying circuit the level promotion. Regarding the common moving-coil microphone output voltage is several millivolts, therefore after needs to be equipped with the first-level amplifying circuit enlarges the signal, songzhi the pre-amplification electric circuit. Regarding turntable, CD record player and LD machine, because its output signal's level reaches above 0.755~1V, therefore may send in the Pre-amplifier directly. (2) impedance match: in the HI-FI sound equipment, for instance the transistor power amplifier's output impedance is the low impedance, but equipment's and so on electron tube the power amplifier output impedances are the high impedance. If they connect with the speaker time the impedance does not match, will cause amplifier's output assignment to be uneven, because or the damping will cause speaker's transient characteristic variation oversized. the impedance matching's connection has balanced -like and not the balanced -like two kinds generally. So-called balanced -like is refers to the transmission signal two core shielded wire to be equal to the place impedance. So-called not balanced -like is refers to two core shielded wires, including earth. When the balanced output connects with the balanced input, must through add the matching transformer to carry on the match.

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