![]() While you’ll use similar cables to connect a mixer to either loudspeaker’s amplifier, connecting passive speakers to their amplifier requires an additional Speakon or ¼” speaker cables. In a passive speaker, the amp is a completely separate device mounted in a rack separate from the speakers. In a powered speaker, the amp is inside the cabinet with the speaker. The real difference is where the power amplifier is located. Their main function is to bring microphone and instruments levels up to line level and then balance the mix before sending it to the loudspeakers. Mixers let you connect and control levels that are received from microphones and sent to speakers. The high voltage level causes the speaker to rapidly move back and forth, thus reproducing an amplified version of your original signal. ![]() When the mix leaves the mixer and enters the loudspeaker’s amplifier, it is dramatically increased to speaker level and controlled by the amplifier’s level control. Once raised to line level, the signal level is adjusted by a mixer’s level controls. The voltage starts at mic level and, after being increased by a preamplifier gain knob, is increased closer to line level. For a PA system, the gain stages are the microphone preamplifier, channel level, mix level, and loudspeaker level. Gain staging refers to each level of preamplification or volume adjustment found in a signal path. The result is a much louder sounding voice.Īnother way to think about amplification is how the signal level, or its voltage level, is increased at separate gain stages of the system. Once boosted by a power amplifier, the voltage is so high that it forces the speakers to move and recreate the sound pressure changes which first entered the mic. That voltage is then sent to either a mixer or loudspeaker for amplification. That means when you speak or sing into the mic, its magnetic force outputs a small amount of voltage. It all starts with the microphone (mic), which converts sound pressure to voltage. In its simplest form, it has a microphone, mixer, and loudspeakers. A public address (PA) system is for amplifying the human voice.
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