PA SYSTEMS
Equipment List:
·
Yamaha EMX 5016 CF
·
ASX 18 dB amp (Mixing Desk), t. amp A1400 (Main
Speaker), t. amp A2400 (Bass Boxes)
·
dB Bass Boxes
·
dB Main Speakers
·
Support Pillars
·
XLR Cables
·
Speakon Cables
·
Jack Cables
·
Masking Tape
·
Power Leads
·
Shure SM58 Microphone
Risk Assessment
Risk
|
Hazard
|
Resolution
|
Lifting
|
Injuring yourself when lifting
heavy equipment
|
Make sure when lifting that you
bend your knees
|
Volume
|
Exceeding 120dB may burst your
eardrums
|
Make sure that the volume is at a
suitable level
|
Water
|
Spilling water on equipment making
it faulty or even catch fire
|
Keep water/any liquid well away
from the equipment
|
Equipment
|
Equipment falling on feet with a
chance of injury
|
Make sure at least 2 people are
handling a piece of any equipment at any given time
|
Wires
|
If wires aren’t correctly taped
then someone could trip and injure themselves
|
Make sure that wires are correctly
taped and out of the way
|
Electricity
|
If wires aren’t safe/pat tested
then there could be a risk of electrocution
|
Make sure that all plugs are pat
tested and connected correctly
|
Feedback
|
Feedback can damage a persons ears due to the increasing
frequency
|
Make sure that levels on the mixing desk are all at an
adequate level
|
How To Setup PA
System
Firstly, you need to make sure that the equipment is all in the
correct position. This entails the mixing desk being in the centre of the two
bass boxes, these should be either side, this creates stereo sound. Stereo
describes sound emanating from a speaker on the left and a speaker on the
right. Make sure that when moving any item that two people are handling it at
any given time.
When the bass boxes and the mixing desks are in the correct
positions, connect the poles onto the top of the bass boxes, once they're
connected, lift the smaller speakers onto the poles (they don't need to be
fastened)
Moving onto the mixing desk, the first thing to do is remove
the case by twisting the mechanisms on each side, after this, open the back of
the desk, do the same with the bottom box, this will expose the amplifiers.
The setup obviously won't work without power so what you must
do is connect a red speakon cable to the right speaker (p.o.v from behind the
desk) and a blue speakon cable to the left speaker, do the same with the bass
boxes. You also need to make sure that there is a quarter inch jack going from
the amplifier to the mixing desk. Lastly what you must do is connect the
microphone to the desk, to do this you need to connect an XLR cable from the
bottom of the mic (female part) to the XLR slot in the desk (male part).
Depending on which slot you've connected the cable to you need to turn on that
row and from there you can contract the volume and the effects of the
microphone as it comes through the speaker. Lastly you must make sure the desk
is connected to the mains, using a kettle connector.
Microphones
How They
Work
Dynamic Microphones

There are different
types of microphone and they work in slightly varied ways, for example, there
are dynamic microphones- in a dynamic microphone the diaphragm is attached to
the coil, when the diaphragm vibrates due to the sound waves arriving, the coil
moves back and forward past the magnet. This creates a current in the coil,
which is transferred from the microphone along the wires.
This small section on the top of the microphone is
called the capsule; the whole process of generating electric current is called
electromagnetic induction.
A good example of a dynamic
microphone is the Shure SM58
Condenser Microphones
The condenser microphone, otherwise known as the capacitor
microphone works slightly differently to the dynamic microphone, for example- a
capacitor has two plates with a voltage between them. In a condenser
microphone, one of these plates is made of very light material and acts as the
diaphragm. The diaphragm vibrates when struck by sound waves, changing the
distance between the plates and in turn changing the capacitance. Specifically,
when the plates are closer, capacitance will increase and a charge current is
created. When the plates are further apart, capacitance decreases and a
discharge current occurs. A voltage is required across the capacitor for this
to work. This voltage is supplied either by a battery in the microphone or by
external phantom power.
Phantom
power is generally considered convenient for condenser microphones, it is the
power transmitted through the microphone cable.
A good example of a condenser microphone would be the AKG C100S
FREQUENCY
Frequency is how many waves occur per second.
Frequency is measured in Hertz (Hz) and Kilohertz (KHz)
The lowest frequency humans can hear is 20Hz and the highest is 17000-20000Hz depending on how old you are, taking into account depletion of hearing.
In music, frequency is controlled by an equalizer, this allows you to raise certain elements of sound, for example, the layout of an equaliser is- Low, Mid, Mid, High- altering the low will change the deeper noises, mainly bass. Altering the mid sections will change the mid frequency sounds, this is usually the main part of the music. Altering the high will change the higher frequency sounds, if the high is the only part turned on then the music will sound tinny.
There are different effects associated with music that manipulate the sound.
REVERB
Reverb is a good example of this as if increased it will cause the music to sound like it's in a hall, or any stage setting. This is because the sound bounces of the walls (reverberates) differently.
GATE
Gate is a more complex example because what gate does is block certain sounds out unless they are at a certain velocity threshold, for example, if you set the threshold to 3000Hz then it will block out anything under 3000Hz.
COMPRESSION
Another effect is Compression, compression narrows dynamic range, making louder sounds quieter and quieter sounds louder, levelling everything for smooth sound. This will make sure that if 3dB is inputted, then 3dB is outputted.
Setting Up A Recording Studio and Recording
- Firstly, you must set up the studio, there are a few steps you must do to achieve this.
-Log into the mac using username: 'teacher' and password: 'sicko'.
-Open Cubase 7 which can be found in applications.
-Click cancel on any popups.
-When loaded, got to file then new project.
-Select 'empty' from the 'more' tab.
-Check the desk is set up (all drivers are connected.)
-Go to project, add track.
-Change the input using the left bar which says mono in.
-Click the small speaker icon on the track to test audio.
- After this, connect the microphones to the wall box in the studio with XLR leads.
- Then, open the mixer in cubase so that you can monitor the levels
- Now, set the gain on the desk
- Optionally, the performer can use headphones to hear the backing track, plug them into the control box
- Finally, you're ready to record, this can be achieved by clicking the red button on the transport bar