PROLOOP D15-LOS: class-D Low-Overspill-loop driver for large rooms up to 3.300 m²

the ready-to-use digital system for setting up digital Low-Overspill-Systems in rooms up to 3.300 m² , incorporates all necessary electronics in a single compact housing. Its power, its strong and steady inductive signal and the audio quality make the PROOLOOP D15-LOS the ideal solution for event rooms and assembly halls. 

The combo-XLR-3-port and the Phoenix contact at INPUT 1 and 2 can be configured as LINE-IN or microphone-In (balanced) ports. 12 V phantom power can be activated on 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 in difficult surroundings. The sound quality of the Master and Slave loop can be checked via a monitoring port for headphones.


  • Homogenous magnetic field for rooms up to 3.300 m²
  • No signal variations when the hearing system user moves his head
  • Reduced sensibility concerning steelwork
  • Compact build / requires less rack space
  • High energy efficiency - low consumption
  • Low heat generation when in use
  • High current output: 2x 15 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

Technische Daten

Power supply: 90-265 V AC 50/60 Hz,
Passive protection: Fuse 3,15A T
Maximum area: 3300 m² according to IEC 60118-4
###Loop output  
Max. current: 2x 15 A RMS / 2x 42,4 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: 2xNeutrik NL4 speakON-socket, layout 1+/1-
Headphones: Headphone output (on front face), 6.3mm jack plug socket
---Monitor output, 6.3mm jack plug socket  
FAULT-output: Device status via potential-free switch contact, not earthed (NO / NC)
PUT 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, 6.3mm jack plug socket  
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 reduction 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-4286-0
Weight: 1,8 kg


A-4286-0, a42860, 4286