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AUDIOropa INDUCTION Loop Class-D driver

AUDIOropa INDUCTION Loop Class-D driver

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PROLOOP D5-LOS, the ready-to-use digital system for setting up digital Low-Overspill-Systems in rooms up to 360 m², incorporates all necessary electronics in a single compact housing. This loop driver is the ideal solution for use in event rooms and larger meeting rooms. Ease of use and according performance reserves enable matching the system to various conditions of spaces and room shapes.

The combo-XLR-3-port and the Phoenix contact at INPUT 1 and 2 can be configured as LINE-IN or microphone-In (balanced) konfiguriert werden. 12 V phantom power can be activated onn both both ports for the use of condenser microphones. In addition, the amplifier has a 100 V input for the connection to according PA- and audio systems. The input amplification can be adjusted on all 3 inputs.

The powerful amplifier is equipped with Automatic Gain Control (AGC), which will provide constant sound and clear voice intelligibility even under difficult surroundings. The sound quality of the Master and Slave loop can be checked via a monitoring port for headphones.


Homogenous magnetic field provision for rooms up to 360 m²
Significantly lower overspill
No signal variations when the hearing system user moves his head
Reduced sensibility concerning steelwork
Compact build / requires lesser rack space
High energy efficiency - low consumption
Low heat generation
High current output: 2 x 5,8 A RMS
Active protection against short circuits
Input for 100V signals, transformer decoupled
Automatic Gain Control (AGC), loop current control
6,3mm headphone jack for monitoring audio signals
Adjuster for metal loss compensation
19 inch rack mounting material included


Power supply: 90-265 V AC 50/60 Hz,
Passive protection: Fuse 3,15A T
Maximum area: 360 m² according to IEC 60118-4
Loop output
Max. current: 2x 5,8 A RMS / 2x 16,4 A peak-peak
Max. tension: 2x 34 V RMS / 2x 96 V peak-peak
Active protection against short circuits
Automatic Gain Control (AGC): Maintains a constant level of the audio signal in the connected loop
Frequency range: 100-5000 Hz ( ± 3 dB)
Distortion: < 1% at rated power output, 1 kHz
Connector: 2x Neutrik NL4 speakON-socket, layout 1+/1-
Headphones: Headphone output (on front face), jack plug socket 6,3 mm
Monitor output, jack plug socket 6,3 mm
FAULT output: Device status via potential free switch contact, not earthed (NO / NC)
INPUT 1 and 2: 0,5 mV to 100 mV / 10 kOhm (MIC) or 25 mV to 4 V / 10 kOhm (LINE) phantom power configurable, Combo-XLR-3 socket (INPUT 1), Phoenix contact (INPUT 2) 12V toggable phantom power
INPUT 3: 100V-Input for connecting PA-systems
Monitor output, jack plug socket 6,3 mm
Automatic Gain Control (AGC)
Dynamics: up to 36dB
Controls and indicators
Master loop current adjustment via rotary control
Slave loop current adjustment via rotary control
Amplification control for INPUT 1, 2 und 3 via rotary control
Adjuster for the compensation of metal loss
Indicators: Loop OK (LED, red)
Protect / Clip M (LED, red)
Protect / Clip S (LED, red)
ON / OFF (LED, blue)
AGC/Compression (2 green LEDs, 1 orange and 1 red LED)
Loop current (2 green LEDs, 1 orange and 1 red LED, each separate for Master and Slave)
Size: 45 x 215 x 220 mm (H x B x T)
Mounting: 19 inch rack fixtures, included
Colour: black
Item no.: A-4281-0
Weight: 1,8 kg