»PROLOOP LOS« for low-overspill applications: trouble-free operation of several loop systems in neighbouring rooms

The PROLOOP LOS is a complete system for the operation of low-overspill systems. It includes the complete range of electronics required in a single enclosure. Thus, there is a flexibly sized, reliable low-overspill solution available to serve neighbouring event rooms and assembly halls up to 300 square metres in size.

The system is equipped with Automatic Gain Control (AGC) to produce steady sound with outstanding speech reproduction, even under difficult acoustic conditions. The inbuilt monitor output for the corresponding measurement technology makes it possible to easily and conveniently test the sound quality of the induction loop system.

  • Even coverage throughout the room (no dead spots in the middle of the room)
  • No signal fluctuations when a hearing-aid user moves his/her head
  • Reduced sensitivity in respect to architecture-related steel reinforcements
  • High efficiency, low power consumption
  • 19“ design
  • Well suited for retrofitted installation in theatres, cinemas, concert halls, schools, conference rooms, housing, etc. (floor reconstruction necessary)

Technical data

Mains connection 230-240 V AC 50 Hz, 25-700 W
Coverage 300 m² acc. to IEC 60118-4
###Induction loop output  
Max. power 2x 5 A RMS / 2x 14 A peak-to-peak, short-circuit-proof
Max. voltage 2x 21,9 V RMS / 2x 62 V peak-to-peak
Output AGC Sets voltage and power for steady signals like oscillation and sine curves after 0.6-1 seconds to -10 dB. Short pulses and normal program signals are not limited.
Frequency range 100 - 5000 Hz ( ± 3 dB)
Distortion < 1%
Cable connection 2 screw connections on rear panel of the amplifier
Master OUT 0 dBm, RCA (with AGC function)
Slave OUT 0 dBm, RCA (with AGC function)
Induction loop monitoring Two 6.3 mm jacks for headphone connection
IN 1 Combined XLR / 6.35 mm connector, MIC sensitivity 2.5 mV – 10V RMS / 10 kOhm, LINE sensitivity 37 mV – 10V RMS / 10 kOhm or phantom voltage 9 – 20 V
IN 2 Dual RCA connections, 45 mV – 10V RMS / 10kOhm
SCART (IN/OUT) Dual RCA connections, 45 mV – 10V RMS / 10kOhm
Dynamics > 70 dB
Rise time 2 - 500 ms
Fall time 0,5 - 20 dB/s Rise and fall times depend on the currently active channel
###Controls and displays  
Loop setting 0 – 300 m² (with one potentiometer each for master and slave outputs)
Input level IN 1 and IN 2 can be adjusted separately
Displays Mains connection: 1 green LED***Input level: 1 green LED***Induction loop power: 2 green LED
Dimensions (H x W x D) 88 x 438 x 280 mm
Colour black
Weight 9,3 kg

A-4252-0, a42520, 4252