Transcript
Basic PA Training - session 1
St. George’s Anglican Church Tunis, 2009
Why use PA?
Why have PA? Who is it for? What do we want from it?
1
Why use PA? • It’s not about making stuff louder – it IS about making it clearer and easier to hear
Sound reinforcement • It’s not a technical fix for bad singing – it CAN help balance out different volumes, different voices, etc. • It does give us some flexibility – we can play CD’s during the service – we could record the service for someone who’s not there • It can help us in our worship – which can only be good!
So, how does it work? Sound travels into the microphone…
…goes from the mic. to the mixer… …mixer to amp…
…amp to speakers…
…speakers to ear!
2
Microphones • What do they pick up? – voice, ‘p’s, foldback, etc.
• Good and bad mics – is it you or the mic?
• Good and bad handling – plugging, switching, hitting, crackling
System layout - inputs Elec Guitar Bass Guitar Spare
Acc Guitar
Piano
Lapel Radio Mic (Leader)
Headset Radio Mic (Worship)
Gathered up into ‘snakes’
3rd Voc
2nd Voc
Lead Voc
Piano Voc
Lecturn
3
Signal levels • 2 types of signal sources, categorized by the strength of their output signals
– Mic level – from microphones • Very low voltage, around 2 millivolts (mV), or thousandths of a volt.
– Line/‘instrument’ level – from instruments, etc. • Stronger, though widely variable signal, typically from 77.5 mV to 24.5 volt • Fed through DI boxes as mic level signals
• These signals get ‘mixed’ by the mixer
System layout - outputs …mixer to equalizer…
…mixer to foldback…
…equalizer to amp… …amp to speakers…
4
The Forest and the Cliff
5
