Loop amplifier Pro Loop D5 LOS

The Pro Loop D5 LOS amplifier offers an ideal solution for use in function rooms and larger assembly spaces. High operating comfort and corresponding power reserves create the flexibility to adapt the loop system to a wide range of spatial conditions.

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
  • 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: 2x 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
###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
Pro Loop D5 LOS


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

A-4281-0, a42810, 4281