CLS1 Induction Loop Driver (3.5 Amps)


The CLS1 is a professional induction loop driver capable of driving loop areas in excess of 2,150 sqft. (200 m²) with an unsurpassed clarity of sound for both music and speech for superior intelligibility. Designed for simple discrete installation, the CLS1 offers the most cost effective and capable solution in its class. The driver is very compact and designed specifically for wall mounting. All connections and controls are secured behind a tamper resistant, hinged, detachable cover. Combined with its small size, the range of mounting and cabling options ensure that installation is convenient and tidy in any environment. Input options are comprehensive, with three independent inputs for balanced microphone, balanced and unbalanced line, low impedance and 100 V line speaker systems.

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One (1) CLS1 Induction Loop Driver (3.5 Amps)
One (1) Handbook and Installation Instructions
One (1) “T” Logo Installed Adhesive Sign – Large (11.7″ x 8.3″)
One (1) P-clip, Nut and Washer


  • Area coverage to 2,150 sqft. (200 m²)
  • Designed for simple discrete installations
  • Simple and fast installation
  • Wall mounted
  • Low lifetime cost
  • Excellent proven reliability
  • 5-year warranty
  • Unparalleled sound quality and intelligibility
  • Speech optimized gain control
  • Metal loss corrector corrects frequency dependent loss from metal structures
  • Extensive input adaptors available for any audio input requirements

Also Needed



Frequency Response80 Hz to 6.5 kHz ± 3 dB
DistortionTHD+N < 0.2 %, 1 kHz Sine Wave at Full Current
AGCOptimized for Speech, Dynamic Range > 36 dB


Gain ControlFront recessed input level control
Metal Loss CorrectionCorrect system frequency response due to metal structures
CoolingNatural Convection


LEDsAGC is Activated, Loop Current, Power
Drive Current IndicationLED


Loop Connector/sScrew Terminal


Input/sInput 1: Balanced Mic/Line (-73/-31 dBu), 12 VDC Phantom Power, Input 2: Balanced Line (-33 dBu), Input 3: Isolated 100 V/ Low Impedence Mono/Stereo Speaker, Input Impedance (Ohms) 120k, 120k, 7.8k, Min Level (dBu) +14/+14/-9, Max level (dBu) +47/+47/+27


Perimeter Loop - Coverage1:1 Aspect Ratio - 1,290 sq ft. (120 m²), 2:1 Aspect Ratio - 1,615 sq ft. (150 m²), 3:1 Aspect Ratio - 2,150 sq ft. (200 m²)Condition 1 - Loop must be 3-6 ft. (1-2 m) above or below the receiver height, Condition 2 - There should be no metal structures in the plane of the loop, Condition 3 - There must be sufficient voltage to drive the loop


ComplianceETL Listed
Power230/115 VAC, 30W, 45-65 Hz, Connected via Chassis Screw Terminals
Drive Voltage6.4 V (RMS) at Maximum Output Current
Drive Current3.5 A (RMS), 5.0 A (Peak) with 1 kHz Sine Wave
Drive Current PeaksShort Term > 7 A
Input Power FuseT250 mA


Width7.9 in. (200 mm)
Height1.7 in. (44 mm)
Depth7.9 in. (200 mm)
Shipping Weight5.1 lbs. (2.31 kg)
MountingVertical Panel Mounting
Cable Length10 AWG - Max distance at full current - 357 ft. (109 m), 14 AWG - Max distance at full current - 330 ft. (101 m), 18 AWG - Max distance at full current - 224 ft. (68 m), 22 AWG - Max distance at full current - 125 ft. (38 m), FB1.8 - Max distance at full current - 436 ft. (133 m)
Weight4.0 lbs. (1.81 kg)


Relative HumidityIP20 Protection, 20 to 90% Relative Humidity, 32 F (0 C) to 95 F (35 C)
* Specifications subject to change without notice.