Measure the background noise with a FSM 2.0 field strength meter, a professional stand-alone measuring instrument for installers, sound engineers and technical staff.

The background noise shall not be lower than -47dB relative 400m/A/m, but up to -32dB can be acceptable. (The certificate of conformity that comes with the FSM 2.0 and with all univox amplifiers provides you with an easy step-by-step instruction how to perform the background measurement and other measurements to fulfil the IEC standard 60118-4.)

Start with a two turn loop. This is important especially when you will cover an area that is considerably smaller than the stated maximum coverage area of the amplifier.

Important:

• The cable must NOT be placed above or close to an inner ceiling made of metal.
• If the floor is heavily reinforced the field strength can be increased by placing the cable on the wall, 3-5 dm from the floor level.
• If the loop is bigger than 200 m2 the distance between the listening area (standard listening area is 1,2m above floor level) and loop must be more than 1,2m.
• Cable from sound sources shall not be placed close to or parallel to the loop cable.
• It is preferred to use balanced inputs with low impedance.
• Pay special attention to low level inputs.
• Do NOT use dynamic microphones, as this results in an increased risk for magnetic self-oscillation.

Plan the location for the amplifier (amplifiers). Each loop shall have a twinned (or paired) connection wire.

Follow the installation guide of the amplifier. Pay extra attention to how to set the input sensitivity level with the AGC-system.

Installation of SLS system with copper foil cable

Watch our YouTube film sequence showing an example how to install an SLS system with copper foil cable.