The simplest sound system in professional audio engineering can be a system consisting of a power supply, a preamplifier, a power amplifier, and a speaker amplifier.
In professional audio engineering, the sound source in the professional audio equipment system is a microphone used to convert the sound signal into an electrical signal. The sound source can also make other sound sources, such as tape player, CD player, MD machine, etc. If the source is not a microphone, you can even cancel the preamplifier. This system is the simplest system for conferences. It requires a microphone and can even cancel the preamplifier. This system is the simplest system for conferences. It requires a microphone. Since the output voltage of the microphone is very small, it is about 0.1mV. To a few tens of millivolts, it is not enough to directly push the power amplifier. The sensitivity (rated input) of the power amplifier is often fixed at about 0db (0.775), so it is necessary to add a preamplifier to amplify the weak voltage signal output from the microphone enough to push The voltage signal of the power amplifier is voltage amplified and current amplified by the precision power amplifier, that is, power amplification, and the power amplifier transmits the amplified electric power signal to the speaker (which we usually call a speaker), and the speaker is in the electric power. The signal is converted into an acoustic signal radiated into the space to complete the sound expansion, that is, the sound reinforcement.
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