Specifications

Status: Released
Version:2.2
Document: ITS-AVS Audio Visual Standards
V2.2Issued.docx
Author: Dean McFadden
Save Date: 25/08/2014
Page 30 of 63
preset maximum without exceeding a hard limit 6dB below the point at which feedback will occur. Provide
separate control for microphone and source audio, and separate mute buttons for each.
2.14.3 Quality
Digital audio signal paths, the reference level (‘zero VU’) shall be -20dBFS in any channel. The sound system
shall be capable of reaching programmed maximum levels without clipping, distorting or overloading any
amplifier or speaker.
2.14.4 Signal Delay
Where appropriate provide any signal delay devices (hardware or in DSP) required to ensure that signal arrival
times from different speakers at all points in the rooms are not greater that 20ms.
2.14.5 Hearing Augmentation
The AV Integrator shall provide a hearing augmentation system for all spaces provided with an inbuilt audio
amplification system as per the BCA requirements. The type of Hearing Augmentation system shall be
determined with due consideration of the type of space, building restrictions, environment, potential
interferences and specific user requirements. As a general guideline, all spaces with seating capacity of more
than 50 people shall be provided with a hearing induction loop system. All other smaller spaces shall be
provided with a 3-pin XLR and a screw lock 2.5mm 12V panel mount jack on a plate to allow for connection of
an IR transmitter. The IR Hearing wall plate is to be located adjacent to a front of house Speaker if available, or
Co-located with FOH Power point but no higher than 3mts AFFL. If there are no front of house speakers the
integrator will require approval of the location.
A DC connector plate is not required at the rack for the 12V IR Plate, a cord mount jack terminated with 500mm
spare cable at the PDU location.
The signal type feeding the IR plate is to be Mono Balanced Line Level, the signal -10dB out of the DSP or
mixer (50mV – 3V).
The hearing augmentation system must be active at all times, including when the AV system is shut down.
Only fixed gooseneck or boundary microphones are to remain active. The Integrator must ensure that all
DSPs, amplifiers and other devices required for the hearing augmentation system remain active at all times.
As a minimum, the hearing augmentation system shall comply with:
a) AFILS shall provide greater than 80% coverage within acceptable tolerances
b) IR systems shall provide greater than 95% coverage within acceptable tolerances, with:
c) A minimum of 1 IR receiver for every 25 persons or part thereof shall be provided in each space
d) Induction loop amplifiers and hardware must be Ampetronic, GPT I-Amp or approved equivalent
e) Infra-red modulators, transmitters and receivers shall be Sennheiser or an approved equivalent
f) Coverage is expected to be even across the designated loop / IR coverage area
g) The AFILS shall be commissioned and tested to conform to AS60118-4.
h) The system shall be designed to minimise the effects caused by:
• Electrical and other cabling
• Metal objects, such as ductwork
• Other sources