15
Metallic
environment
Basic level
(1000Hz)
IEC level
(1600Hz)
Field Strength
Attenuation
Important notes/requirements
No metal
22m/70ft
22m/70ft
0
Standard
reinforced
concrete
7m/23ft
5m/16ft
3.5-6dB
Increased current, voltage and power
Heavily
reinforced
concrete
5m/16ft
4m/13ft
3.5-6dB
Increased current, voltage and power
Suspended
ceiling
4.8m/16ft
3,6m/12ft
4-10 dB
Conductor must be centered in the
suspended ceiling framwork (longest
distance to metal)
Increased current, decreased power
Steel deck/
Metal system
floor
4m/13ft
3m/10ft
6-10dB
Increased current, decreased voltage
Iron bar
construction
3m/10ft
2m/6.5ft
4-12dB
Medium/strong damping, depending
on placement of wire (avoid
placement along metal bars)
Maximum recommended segment size (to comply with IEC 60118-4)
Placement of the driver
The Univox PLS-X loop drivers will not generate much excessive heat and can be mounted
in 19" racks on top of or below other rack components (check that these don’t generate
excessive heat), on a wall or another flat surface. In a rack system it is often practical to
attach the external power supply to the supporting metallic construction using straps. For
mounting on the wall you need to open the chassis to get access to the mounting holes.
Note
The power supply must be connected to a wall socket close to the loop amplifier.
Although there are several built-in protection schemes for temperature, current and power
etc. we recommend to plan for worst case scenario.
The loop cable mustn’t be placed closer than 30cm (12in) to a parallel microphone or
mixer cable. Crossing is ok.
Placement of the microphones
Microphone placement is crucial for speech intelligibility. Use shortest distance possible
between microphone and mouth/sound source.
