LV-1: Sound System - Intermediate Stage Equipments

in the previous Topic, we talk about five Equipments from Intermediate Stage Equipments and today we will continue with other Intermediate Stage Equipments

6-Monitor Unit: 
A-Monitor unit Functions: 
  • It monitors the amplified signals resulting from the Audio amplifier by using a built in additional speaker for testing the quality of this audio signal. 
  • It monitors the amount of gain in the audio signal by using a metering device. 
  • it include the input signal and output signal Jacks plus a volume and balance controls. 

There are three types of Audio Monitoring Unit as follows:

a- Digital (see fig.1)

This unit is used with sound systems having Digital amplification and digital processing 


b- Analog (see fig.2)

This unit is used with sound systems having analog amplification and digital processing 


c- Audio/video (see fig.3)

This unit contains Multi-function waveform which includes adjustable White and Black clip level indicators can be displayed in three different aspect ratios including Full Screen. The unit also contains built-in Vectorscope displays in full color and can also be displayed in three different ratios. 


7-Speaker Selector: (see fig.4)

A speaker selector is a device that allows the user to transform one audio input source into multiple audio outputs.

The speaker selector allows you to play the audio over as many speakers as you want and control which speakers will be on and which will be off. 


Some speaker selectors are more advanced and include individual volume controls for each output. That way, if you want to blast the audio for speakers’ line and quietly play the audio in other, you can. 

There are some speaker selectors that come with amplifiers to boost the audio. 

8-Power Supply: (see fig.5)
A power supply is a device that supplies electrical power to one or more electric loads 

A regulated power supply is one that controls the output voltage or current to a specific value; the controlled value is held nearly constant despite variations in either load current or the voltage supplied by the power supply's energy source. 


Power Supply Function: Power Supply provides the different units with the necessary power for operation

Types of power supply units:

1- AC power supply 
An AC power supply typically takes the voltage from a wall outlet (mains supply, often 230v in Europe) and lowers it to the desired voltage (eg 9 or 12 vac). As well as lowering the voltage some filtering may take place.

2- DC power supply An AC powered unregulated power supply usually uses a transformer to convert the voltage from the wall outlet (mains) to a different lower voltage. If it is used to produce DC, a rectifier is used to convert alternating voltage to a pulsating direct voltage, followed by a filter, comprising one or more capacitors, resistors, and sometimes inductors, to filter out (smooth) most of the pulsation.

9-Terminal Boards 
(see fig.6)
Terminal Boards used for connecting of the speakers with the amplifiers and their size differ according to the number of speakers and the amplifier power.



In the next Topic, I will explain other types of Intermediate Stage Equipments : Remote Control Unit and Crossover, please keep following

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