PROLOOP D15: class-D loop driver for large rooms up to 1.300 m²

The loop amplifier PROLOOP D15 is specially conceived for deployment in public and commercial installations. The system is actively protected against short circuits and is noteable for its high reliability and safety. The PROLOOP D15 supplies rooms up to 1300 m² with steady inductive audio signals of excellent quality. 

The combo-XLR-3 in-port as well as a further phoenix contact are invidually configurable:
a) as audio-in (balanced)
b) as microphone-in (unbalanced)

The microphone mode allows the activaton of phantom power for the use of condenser microphones.

The Automatic Gain Control (AGC) guarantees a constant field strength, a exemplary high stability in sound volume and good sound reproduction. A monitor port allows a dirct connection with further loop amplifiers.


  • Easy to use
  • High current output: 15 A RMS
  • Resistant housing
  • Compact build / requires less rack space
  • High energy efficiency - low consumption
  • Low heat generation
  • Active protection against short circuits
  • Combo-XLR-3 input and input via phoenix contact, configurable for:
    • microphone (phantom power)
    • audio source
  • 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
  • Suitable for setting up Low-Overspill-Systems
  • 19 inch rack mounting material included


Power supply: 90-265 V AC 50/60 Hz,
Passive protection: Fuse 3,15A T
Maximum area: 1300 m² according to IEC 60118-4
###Loop output  
Max. current: 15 A RMS / 42,4 A peak-peak
Max. tension: 34 V RMS / 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: 1 Neutrik NL4 speakON-socket, layout 1+/1-
Headphonhe: headphone socket (front face), audio jack 6.3 mm
---2x Slave Out with 0° and 90° phase shift, 6,3mm jack plug socket  
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
---Slave In, 6,3mm jack plug socket  
###Automatic Gain Control (AGC)  
Dynamics: up to 36dB
###Controls and indicators  
---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 (LED, red)***Clip (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)
Size: 45 x 215 x 220 mm (H x B x T)
Mounting: 19 inch rack fixtures, included
Colour: black
Art.-Nr: A-4285-0
Weight: 1,6 kg


  • User manual
  • Declaration of Conformity - Please contact us!

A-4285-0, a42850, 4285