How it Works

  • Front of House
    The Microphone signal is sent through the desk and into the digital main EQ. This is used to clean up the initial signal by either brightening the audio, taking out low muddy frequencies etc. The signal coming out of the desk is sent into a crossover box that acts as a splitter to separate the High-Mid frequencies and low bass frequencies to the correct monitors. This is done so that the signal does not blow a speaker. The FOH monitors are passive and require amplifiers to boost the signal and produce noise.

 

  • Stage Monitors (Fold Back) –
    The Signal is then put through the digital mono EQ. This is done to ‘ring out the system’, a process of identifying feed backing frequencies and removing them. Generally this EQ would be a graphic EQ as these have faders for a lot of frequencies’ within the audible range. The processed signal is then sent out to the fold back monitors by sending the signal to a bus/monitor output in the desk and onto the QSC RMS 1450 amplifiers which are needed as the fold back wedges are passive and will not power the signal.

 

diagram

Equipment Suitability

Yamaha LS9 32 Digital Mixing Desk

This digital mixing desk has a built in virtual rack with various effects including EQ. This is useful for the venue as it saves on cost and space. Another good function is the Recall memory allowing sound checks to be done in one go and then instantly recalled when a band changes over.  The desk also has 32 microphone/line inputs and 64 Channels giving them more than enough channels for a large range of genres such as a small acoustic pop artist to a full grown jazz band.

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QSC RMS 1450 amplifiers
These amplifiers come with automatic built in clip limiters to help stop clipping whilst still giving out a peak performance. They also include selectable low-frequancy filters to avoid blowing your speakers and also so you can adjust the amplifier’s range to that of your chosen speakers. This is useful as it means that if they decided to change there monitors to different ones than the amplifier will still work well with them and not blow them. The price of these amplifiers is around £350 each meaning that they are not spending too much as far as music equipment goes. The amplifiers also include three outputs with balanced XLR and ¼” jack outputs and also speakon outputs to match various types of monitors.

rmx1450

 

 

 

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