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  • PAVA System - introduction

DESIGNING OF PAVA SYSTEM – ISSUES

PAVA system – components

PAVA system – requirements

LOUDSPEAKER LINES

  • Supervising lines – controlled break and short circuit
  • Systems with high impedance speaker – 100 V technology
  • Long wire – less value of the electric current
  • Simple installation – (different types of speakers with various loads can be connected to the same line
  • Allowable voltage drop – 10%
  • Fire proof cables
  • Damage to a single circuit should not cause total loss of coverage (wiring redundancy)
  • Appropriately designed zones
  • Different speaker lines in fire zones and loudspeaker zones

DEVICES

  • Controlled all system components
  • Control units and amplifiers comply with the EN 54-16 requirements
  • Power supply units comply with the EN 54-4 requirements
  • Loudspeakers comply with the EN 54-24 requirements

MESSAGES

  • Ability to play different messages to different zones at the same time – sequences of announcements
  • EVAC, ALERT, CODED and INFORMATION messages
  • The aim of the broadcast message is not to inform people about the problem threat, but to force  to take action related to the evacuation.

SPL (Sound Pressure Level)

  • Absolute minimum sound level – 65 dBA,
  • Absolute minimum sound level at bedtime – 75 dBA,
  • Audible sound alarm above background noise (the ratio of signal to noise ratio) of 6dB to 20dB – recommended 10 dB,
  • The maximum level of 120 dBA sound the alarm.

STI (Sound Transmission Index)

  • The quality of messages
  • Speech intelligibility throughout the coverage area should be greater than or equal to 0,5 STI.

Sound pressure level

Sound pressure level (SPL) and the distance –  With each doubling of the distance SPL drops by 6 dB

Sound pressure level (SPL) and power – With each doubling of power SPL increases by 3 dB

Sound Transmission Index

The quality of messages

  • The quality of messages affected by the following factors:
  • The level of background noise
  • Signal level
  • Features of the audio source,
  • The location of the sound source,
  • Location plane overflow
  • The acoustics of the room.

Acoustic simulations

  • Project support in the selection of speaker placement in the modeled rooms,
  • Input data – very difficult to define, precise definitions are necessary finishing materials,
  • Different methods of measurement and calculation programs,
  • Experience with the use of simulators guarantee to avoid the thick mistakes

Acoustic simulations

Basement floor in the office building

Acoustic simulations

Shopping mall

Acoustic simulations

Railway station

SPEAKERS EN54-24

EXAMPLES OF SPEAKER LAYOUTS

ROOM up to 35m2 – 1 SPEAKER

OPEN SPACE OFFICE – 1 SPEAKER  – 6-7m

CORRIDOR – 1 SPEAKER  – 6-7m

UNDERGROUND PARKING