DD Solutions offer a full range of Induction Loops ranging from hard wired to Infrared. These systems can be installed in your work place, Home, leisure or place of worship.
An Induction Loop system helps the hard of hearing who use a hearing aid or loop listener hear sounds more clearly because it reduces or cuts out background noise. At home, for example, you could use a loop to hear sound from your television. In your car you can use a loop system to help you hear the stereo or radio. You can also set up a loop with a microphone to help you hear conversations in noisy places. In the theatre, a loop can help you hear the show more clearly. Normally, a loop system cannot give stereo sound. If this is important, you could consider using an infra-red system
HOW DO INDUCTION LOOPS WORK
An Induction Loop is a cable that goes around the listening area. An electric current is fed to the loop by an amplifier that gets its signal from a connection with a source of sound. This can be a sound system or TV set, or a microphone placed in front of the person speaking. The resulting current in the loop produces a magnetic field that matches the sound. You can then pick up this magnetic field if you are sitting within the area of the loop and your hearing aid - or loop listening aid - is set to 'T'. You can adjust your hearing aid for volume in the usual way. Some telephones have a very small loop, called an inductive coupler, in the earpiece.
POSSIBLE PROBLEMS WITH INDUCTION LOOPS
Be aware that the loop signal can spill out beyond the area within the loop to other rooms. Walls, ceilings and floors do not block the magnetic waves from a loop. So you may be able to overhear sounds or conversations in rooms next door or directly above and below the loop. This could be a problem if your neighbour also uses a loop system, or if you want to have a confidential conversation. To get round this problem, you could try to reduce the size of the loop - although you might need to rearrange the seating. Alternatively, you could use an infrared system.
WHAT IS AN INFRARED SYSTEM ?
An infrared system consists of a transmitter and a listening receiver. Sound is fed to the transmitter in the same way as with a loop system - either by a direct electrical connection or via a microphone. It is then transmitted to you as invisible infrared light
DDA 400 Article No. 099888
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INDUCTION LOOPS AVAILABLE
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1.2m.sq. PL1 portable induction loop system Ideal for restricted person to person contact in areas such as banks, post offices, small meeting rooms, reception desks, open plan offices and ticket booths Portable, lightweight design means the system can be moved easily from location to location Can be used as normal whilst charging. |
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1.2m.sq. ML1/K double gang fixed counter loop system Ideal for banks, post offices, small meeting rooms, reception desks, ticket booths and any other application requiring restricted or small area coverage Requires no specialist audio experience or connectors - can be fitted by any competent electrician Space-saving double-gang wall-mounting amplifier fits standard UK 25mm back boxes (requires fixed mains wiring). |
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1.2m.sq. PDA102C free-standing counter induction loop system Ideal for banks, post offices, small meeting rooms, reception desks, ticket booths and any other application requiring restricted Includes a 3.5mm microphone input (for use with the AMT microphone supplied) and a line/outreach socket Designed to be free-standing or wall-mounted |
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1.2m.sq. VL1/B1 12V vehicle induction loop system Ideal for cars, taxis, buses and other private/commercial vehicles Kit includes a compact mini-induction loop amplifier with keyholes for dashboard mounting, a cigarette lighter power adaptor, an AMT microphone, a pre-formed loop and an 'AFILS fittted' sticker Metal compensation control helps combat the frequency response problems caused by metal 'absorbing' the magnetic field |
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50m.sq. PDA102L/R/S small room induction loop systems Three variants available PDA102L, ideal for use in small meeting rooms, council chambers, doctor surgeries, etc. PDA102R, ideal for small room applications where equipment needs be mounted above suspended ceilings, etc. PDA102S, ideal for use in nursing home TV lounges. |
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50m.sq. DL50/K domestic induction loop system Free-standing - ideal for bedrooms, living rooms, TV lounges, studies and other domestic applications
Alert tone input for doorbells, fire alarms, security |
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120m.sq. AK Range induction loop amplifiers and kits Available in a wide range of kit formats - suitable for use in meeting rooms, waiting rooms, TVlounges, health and fitness suites, churches, etc PDA200E amplifier includes straightforward internal screw connectors Wall-mounting metal enclosure for permanent installation Internal drive, level and tone controls |
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200m.sq. to 900m.sq. PDA Pro-range induction loop amplifiers Ideal for theatres, cinemas, churches, conference halls and other applications where top quality sound is a must Each unit includes two XLR 3-pin input sockets (one balanced mic. and one switchable balanced mic./line) and one outreach connector. Adjustable level controls provided for all inputs - can be used individually or together as a three-input mixer Metal compensation control helps offset the frequency response problems associated with excessive metal in a building Advanced audio signal processing with automatic gain control |
THE OUTREACH PLATE AUDIO INPUT EXTENSION SYSTEM
The Outreach Plate audio input extension system comprises a range of wall, ceiling and desk mountable single gang audio input plates specifically designed to increase the audio input capability of an induction loop system. Covering the most common variants of audio connector, they work by mixing the signals from various audio input sources into one balanced line level input which can be fed into the line input of a compatible amplifier.
Mountable on 25mm single gang back boxes, each plate features a built-in mixer, pre-amp, input level control and balanced output.
Typically, up to 10 Outreach plates (any mix) can be daisy-chained to one balanced line level input with cable lengths of up to 100m easily achievable using standard two-pair audio cable with no recognisable degradation of audio signal quality.
Each outreach plate requires four wires, two balanced line (A+, A-), one ground (0V) and one power connection (12-32 V DC regulated). To facilitate their straightforward connection, most PDA Range amplifiers are fitted with an Outreach connection socket as standard.
INDUCTION LOOP CABLE
There is nothing electrically special about induction loop cable. Almost any stranded or solid single core cable with tough insulation can be used, provided it is not liable to break (to minimise the chance of it shorting to earth and damaging the amplifier's output) and is of the appropriate gauge and DC resistance (0.5 to 1 Ohm). If purchasing a PDA Range induction loop kit, always use the loop cable supplied with the kit. If purchasing an amplifier that does not include loop cable, refer to the loop cable selection chart in our Guide to AFILS.
MICROPHONES
Electret microphones have the highest tolerance of magnetic feedback and are therefore recommended for induction loop systems. Dynamic microphones should not be used as they contain moving coil magnets which can be affected by the magnetic field generated by the loop. Phantom power is provided on all PDArange amplifiers, so electret microphones with internal batteries are not necessary.