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PRO5/DD, PRO7/DD & PRO11/DD Amplifiers

A new range of compact free-standing, constant current, phase-shifting hearing loop amplifiers, from SigNET.

  • Clear & intuitive graphical interface allows simple set-up of input levels, output current, phantom power and metal compensation
  • 200m2, 500m2 or 1000m2 coverage (model dependent)
  • 2 x XLR mic/line inputs (selectable)
  • Digital optical 'Toslink' connector facilitates easy connection to TVs, soundbars, etc
  • Outreach connector allows up to 10 of our revolutionary audio input utility plates to be added
  • Anti-tamper lock function prevents unauthorised adjustment of system settings
  • 5 year warranty as standard
  • Class D output stage for maximum efficiency and very high output
  • Superior analogue audio processing with a powerful CPU and cutting-edge technology provide life-like speech and frst class music reproduction
  • Short circuit protection against loop faults for increased reliability
  • Fault relay & graphical display provide clear indication of operation and fault status
  • Industry leading dual action automatic gain control compensates for poor microphone technique
  • Line level output for recording or daisy-chaining multiple units to cover larger areas.
  • Designed and manufactured in the UK


200m2 Free-Standing, Phase-Shifting Hearing Loop Amplifer - 2 x 3.25 Amp
500m2 Free-Standing, Phase-Shifting Hearing Loop Amplifer - 2 x 5 Amp
1000m2 Free-Standing, Phase-Shifting Hearing Loop Amplifer - 2 x 7.5 Amp


Supply Voltage:
230V 50Hz with IEC 320 fused mains lead.
Power Consumption:
100W / 200W / 400W (model dependent)


Line In:
Input impedance: 1k + or – input to ground. Sensitivity: -20dBU typical.
Input impedance: 1k + or – input to ground. Sensitivity: -42dBU typical.
Phantom power for electret microphones: 12V selectable (on/off)
Input impedance: >10k. Sensitivity: 0dBU typical.
Outreach power: 24V d.c. nom. available via outreach connector (100mA max.)
TOS Link digital receiver. Up to 24 bit, 96kHz sampling.


Loop 1 & Loop 2
Type: True current mode. Loop output voltage: 14V. Dual Loop drive current @ 1 ohm: 2 x 3.25A
(PRO5/DD); 2 x 5A (PRO7/DD); 2 x 7.5A (PRO11/DD).
Line Out:
775mV output
Fault Relay:
Single pole double throw (SPDT): NC, Common, NO.)
Phase Shift:
2 x 900 phase shifted. Selectable (on/off).
Metal Compensation:
Up to 10dB / octave design counteracts frequency dependent absorption by metal in the installation over a bandwidth of approximately 5kHz.


Maximum Coverage Area:
200m2, i.e. rooms up to approx. 14m x 14m (PDA5/DD). 500m2, i.e. rooms up to approx.
22m x 22m (PDA7/DD). 1000m2, i.e. rooms up to approx. 31m x 31m (PDA11/DD). Loop impedance: 0.5 to 2 ohm.


Frequency Response (-3dB):
100Hz to 5kHz; Distortion: Less than 1 % typical; Signal to Noise Ratio: Better than –65dB any input; AGC Range (3dB change in output voltage current): 10dB. AGC ratio: 20:1.


Sensitivity Level Controls
Line In, Mic, 12V Phantom, Outreach, Optical, Metal Comp, Drive1&2, Loop, Phase Shift.
  • Microphone (3-pin XLR on free-standing model; 3-way pluggable on wall-mount)
  • Line In (3-pin XLR on free-standing model; 3-way pluggable on wall-mount)
  • Loop (4 way binding post on free-standing model; 4-way connector on wall-mount)
  • Outreach (4-way pluggable connector)
  • Line Out (3-way pluggable connector)
  • Fault Relay (3-way pluggable connector)
  • Optical
  • 230Va.c. connector (Mains lead for free-standing model; Fixed mains for wall-mount)
Dimensions and weight:
Free-standing: 67H x 218W x 280D mm. Wall-mount: 298H x 308W x 74D mm
Weight: Free-standing: 2.38kg;
Panel Construction:Mild steel zintec, 1mm thick, black powder coated;
IP Rating: IP40; Operating Temp: 0oC to 40oC; Maximum Humidity: 95% non-condensing
Pro 5/7/11

Specific References


Signet Afils Guide

SigNET loop guide overview

Download (5.18MB)

Pro5/7/11 Instructions

Professional Audio-Frequency Induction Loop Amplifiers Installation

Download (87.6KB)

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