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Download Amps - Pacific Audio Visual Institute
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AMPS An amplifier is any device that changes, usually increases, the amplitude of an input signal. The “Input signal" is usually voltage or current. Clipping When the input signal to the amp gets too hot the output circuitry cannot keep up with the input demands This causes clipping to occur Generally clipping will not cause damage to the amplifiers but will cause damage to speakers, especially high frequency drivers in a passive cabinet The odd flash of a clip light is ok but if it’s on steady reduce the input. Protect Amplifiers have built in protection circuitry to automatically stop them from being damaged If an amp over heats it will go into “Protect Mode” or “Thermal Protect” The Amp will shut off its output in protection mode When the temperature decreases back to normal operating range the amp will turn on the outputs. Protect Cont. If the amplifier feels very hot check to see if the fan is working properly Amplifiers also have short circuit protection. If there is a dead short the amp will shut down its output A blown speaker can cause a dead short If possible setup the amps so the protection and signal lights can be seen from the FOH mix position or monitor mix position Keep them out of direct sunlight Stereo Two inputs, one for each channel, controls both sides of the amp. Parallel Mono, one input controls both sides of the amp. Bridge Mono Bridge mono mode combines two amp channels into one mono, much more powerful amp channel. This is most often used for subwoofers. The advantage of bridge mono is that you have a much higher power rating; The disadvantage is that you have only one amp channel. Amplifiers have separate stereo and bridged mono power handling specifications. Connecting speakers to an amp in bridge mono mode is different from stereo mode. Usually you connect a banana plug to the middle two positive banana outputs. You must also flip the amp into bridge mono mode, using dip switches on the back of your amp. Power is Approximately Quadrupled Never switch to bridge mono mode when speaker are wired separately to each output.