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Buying the right PA for your band and building

Buying the right PA for your band and building. Glyn Chapman Acoustic Arrangements. Who’s it for? What’s it for? Who’s going operate it? What worship styles? For now or for the future? Plan for occasional needs. What about video, lighting & electrics.

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Buying the right PA for your band and building

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  1. Buying the right PA for your band and building Glyn Chapman Acoustic Arrangements

  2. Who’s it for? What’s it for? Who’s going operate it? What worship styles? For now or for the future? Plan for occasional needs. What about video, lighting & electrics. What best serves the vision of the Church. Needs Analysis

  3. The Sound System • Basic System • Source • Mixer • Amplifier • Loudspeaker

  4. Microphones Dynamic (moving coil) Condenser Pick-Up Pattern Style DI Boxes (direct injection) Active/Passive Electro-Acoustics, Keyboard, Bass Radio Mics, CD, DVD, PC Inputs

  5. Balanced Cable Cables, Connectors, Multicore

  6. XLR pin 1 gnd, pin 2 +ve (hot), pin 3 -ve (cold) JACK TRS: tip, ring sleeve (stereo jack) as balanced: tip +ve, ring -ve, sleeve gnd To unbalance: link gnd & -ve Cables, Connectors, Multicore

  7. Multicore: How many sends? How many returns? How long? Cables, Connectors, Multicore

  8. Analogue ‘v’ Digital Number of inputs (channels) EQ Routing: Auxiliaries Powered or Unpowered Mixer

  9. Effects: Reverb, Chorus, Delay Compressor/Limiters Gates Graphic Equalisers Crossovers Speaker Controllers Processors

  10. Constant Voltage 100v Line Speaker load not exceed 75% of amp power. Low Impedance Example: 500w into 4ohm = 300w into 8ohm = 700w into 2ohm Allow for headroom up to twice speaker power Amplifiers

  11. Power: RMS = Continuous Program = 2 x Continuous Peak = 4 x Continuous Sensitivity: SPL – Sound Pressure Level Ex: 400w 96dB speaker is same level as 200w 99dB speaker I.e. you need twice the power for 3dB increase in level Add 2nd speaker adds 3dB or 6dB if placed together Speakers

  12. Inverse Square Law: -6 dB per distance doubled Dispersion Low Impedance/100v Line Line Array Horn Loaded Speakers

  13. Speakers

  14. Listen to advice from professionals Check your cables & connectors Throw away old, broken or unusable kit Use your ears Check your mid range EQ Don’t buy something just because it’s on offer Buy the right product for the job Cost is part of the specification Top Tips

  15. www.a-a.uk.com

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