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Induction Loops from Oval Window AudioSatellite III Induction Loop Assistive Listening System -- Specifications & Installation Considerations

The Satellite III (retail) system contains the following components:
  • One Satellite III loop amplifier with built in 2 space rack mount & feet for free standing operation
  • One 500 foot spool of 14 gauge loop wire. Specify your preference for black or white wire.
  • One Induction Loop Receiver with lightweight headphones & LED signal display
  • One phono plug patch cord
  • One wall mountable sign
  • Instructions & unlimited tech support

The Satellite III is designed to interface with existing public address systems and is our most popular and cost effective large area induction loop assistive listening system. It is often used in houses of worship, libraries, auditoriums, meeting rooms and theatres, providing coverage of up to 300-325 feet in perimeter. In the event larger areas need to be looped, multiple Satellite III systems may be linked, with each system covering no larger than a 300-325 foot perimeter area. Alternatively, two Satellite III amplifiers may be bridged enabling powering of a loop perimeter up to 500 feet.

The Satellite III is compatible with all telecoil-equipped hearing aids, cochlear implants and induction loop receivers.

The Satellite III amplifier is designed to be free standing or rack mounted using its built in 2 space rack mount. The amplifier should not be placed near a heat source. At least 1 rack space above and below the amplifier is necessary to permit adequate air circulation.

The Satellite III may be interfaced with any audio line level signal available from the sound system mixer/mixer-amplifier. Appropriate outputs are usually identified as “line” or “auxiliary output.” Use of the Satellite III amplifier’s unbalanced phono input jack is recommended for most installations where the sound system signal feed is short (less than 5 feet). If the signal feed is longer, the balanced input should be used to minimize noise.


This loop system includes a 500 foot spool of 14 gauge single conductor stranded wire (black or white color may be specified). The actual perimeter of (each) area to be looped should not exceed 325 feet per loop system unless a dual amplifier bridged system is used.

The total 14 gauge run of a single loop amplifier wire + lead in should be at least 300 feet so as to present the proper minimum load to the amplifier. If longer lead in wire is needed (exceeding what is available on the supplied spool), it should be at least 10-12 gauge in order to minimize signal losses. The lead in wire may be twisted to minimize signal bleed to nearby low level lines or sensitive equipment.

When looping smaller areas (100-200 feet), 20 gauge wire may be provided or multiple series 14 gauge loop runs must be installed, for example, two turns around a 150 foot perimeter area. A two turn series loop will result in a 3 dB boost in the signal strength. Please note: Installing a “two turn series loop” means running the loop wire once around, and then continuing around the perimeter one more time in the same direction. This effect may also be achieved by using a two conductor wire (please request “series loop” instructions).

Satellite III Technical Specifications

Inputs & Outputs:

  • Two unbalanced paralleled phono jack line inputs, 10-100k Ohms impedance, 50-500mv input
  • One balanced screw terminal input, 600 Ohms impedance
  • Two screw terminal loop wire outputs, 1 and 8 Ohms (1 Ohm must be used with wire provided)
  • One push-terminal 1 Ohm loop wire output for temporary (e.g. portable) applications
  • Amplifier: 11.5 amps continuous output @ 1 kHz into 1 Ohm load

Controls & Visual Signal Indicators:

  • Volume
  • Adjustable non-distorting peak limiter
  • Adjustable high frequency equalization (on rear panel)
  • LED peak clipping indicator

Field Strength:

400 milliamperes/meter peaks, +/- 3dB, as measured 39” above the center of a 300 foot circumference 14 gauge loop wire as per IEC 60118-4 specifications

Frequency Response:

Equalized response of loop system is in accordance with IEC 60118-4 frequency response specification: 100 Hz – 5 kHz +/- 3dB

Loop Wire:

500’ of high quality 14 gauge (3/32” O.D.) single conductor stranded wire is normally provided to allow for connection to actual loop that should not exceed 300-325 foot perimeter. Smaller gauge shorter wire will be provided for looping smaller perimeter areas. Please specify your preference for black or white wire. Larger areas may be covered by bridging two Satellite III amplifiers, or by using multiple systems.

Amplifier Power, Dimensions, Weight, Fuses:

115-120V AC, 2 amps/230 Watts (220-240V versions available for export), 19”W x 3 1/2”H x 11”D, built-in 2 space rack mount, 22 pounds, two internal 6 amp fuses (3AG)

Important Satellite III installation conditions and recommendations:

Please note: we strongly advise laying out (or tacking in place), setting up and testing the system in the planned location before performing final installation.

#1. Using the Induction Loop Receiver provided with the system, a pre-installation listening check and measurement should be performed in the areas where loop systems will be installed to ensure that there are no sources of strong electromagnetic fields that can interfere with the system. Please contact Oval Window Audio for information concerning the mitigation of noise.

#2. The loop wire may be installed in crawl spaces, under carpeting/flooring, in plastic conduit or clips on the wall, on/above ceiling, or simply taped down for temporary use.

#3. The loop wire may be installed in existing concrete floors by cutting a 1/8” W x >¼” D groove in the floor, placing the loop wire in the groove and filling in the space with epoxy sealer. Please contact us regarding the specification of the required "direct burial wire" for this application.

#4. The loop wire may be installed in a newly poured concrete floor by first running the wire through ½” to1” PVC conduit. The PVC conduit should be placed in the floor so that it is as far away from structural steel as possible and close to the flooring surface. The conduit may be tied to wooden support struts before concrete is poured. Alternatively, scaffolding may be used to hold the PVC conduit in place while the concrete is poured. PLEASE NOTE: Whenever possible, loop wire placement should be fully tested before performing final installation.

#5. Conventional loops transmit signals that spill outside the looped listening areas. At least twice the length of the longest side of the loop must be allowed between looped areas on the same floor. In regard to loop systems on different floor levels, the systems should be separated by at least one half the length of the longest side of the loop wire.

Please contact us regarding special techniques that may be used to reduce signal spill over.

#6. In order to maintain proper signal strength and signal uniformity, the loop perimeter in each listening area should not exceed 300-325 feet. The extra wire provided with the systems may be used as loop lead-in wire to connect to the loop amplifier. If longer lead-in wire is needed, 10-12 gauge wire is recommended in order to minimize power losses.

#7. Multiple Satellite III systems may be used to cover larger areas. As with stereo/multiple loudspeakers, multiple loop systems must be checked for proper phasing so that the loop signals are working to support each other. Correct phasing will generally occur if all loop wires are installed and connected to the loop amplifiers’ output terminals in the same orientation. For example, all loop wires can start at the “C/-“ terminal and be installed in a clockwise direction around the seating areas. Phasing of multiple loop systems should be confirmed by walking from one looped area to another while monitoring the signals. If the loops are out of phase, there will be a noticeable signal loss in the areas where the loop wires meet. The remedy is to reverse the phasing of one of the loop amplifier outputs. This can also be accomplished by changing the position of the (unmarked) phase reverse rocker switch on the rear of one of the Satellite III amplifiers.

#8. Larger areas up to 500 feet in perimeter, may also be serviced by bridging two Satellite III amplifiers. Please refer to information on the Satelllite III bridging sheet.

#9. Due to “dead spots” that occur directly above and below the loop wire, the sides of the installed loop wire should not be situated directly above or directly below seating within the listening area. The sides of multiple loop wires must meet in areas where there is no seating, such as in aisles.

#10. The loop wire must not be run in continuous contact with metal, either directly above or below the loop wire. Loop wires may cross ceiling framework and may briefly run behind metal furniture. At least 70% of the total loop must be free of metal obstructions.

#11. At least 70% of the loop wire should be installed in the horizontal plane.

#12. The loop wire must completely encompass the listening area.

#13. The height of ceiling loop wires must not exceed 10-12 feet above the floor of the listening area. Please contact Oval Window Audio for information on planned loop heights > 12 feet.

#14. Floor level loop wires must not exceed 3-4 feet below non-metallic floors.

#15. Avoid running loop wire in close proximity and parallel to telephone lines, microphone cords and video feeds and monitors. Maintain a distance of at 12” and run full interference tests before final loop install. Microphone and video cables should be balanced and of the highest quality so as to avoid interference from the loop wire.

#16. The use of dynamic microphones or musical instruments with magnetic pickups can result in equipment feedback. To avoid this, whenever possible, use condenser microphones and/or keep dynamic microphones & musical instrument pickups at least 10 feet from the loop wire. Run full interference tests before final loop install.

#17. Follow calibration instructions provided with the Satellite III system, in summary:

• Set PA system for normal operating level

• Increase Satellite III volume control setting until Peak LED flashes brightly with audio signal

• Increase Satellite III limiter control setting until flashing of Peak LED diminishes slightly

• Using the Induction Loop Receiver, always begin system set ups with all inputs and output controls at MINIMUM settings, slowly increasing levels until proper signal is attained in the center of the loop. Correct signal strength will fllash the Induction Loop Receiver's green LED when the receiver is held upright in center of the loop, and throughout the looped area. Please refer to the Induction Loop Receiver instructions for details.

• Please contact Oval Window Audio to learn about certifying loop installations in accordance with the latest international standards.


All Oval Window Audio products are sold on a 30-day satisfaction guaranteed basis and with a 3-year warranty covering parts and labor. Exceptions to this warranty include microphones, rechargeable batteries and ear/headphones which are guaranteed for 90 days. Warranty will be voided for equipment that has been abused, altered or operated in a manner contrary to directions contained in the user manual. A return authorization must be obtained for all equipment returns and servicing.

Unlimited technical support is included with all Oval Window Audio products.

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You'll find detailed information regarding most of our products right here online. However, if you have any questions, simply e-mail us directly. One of our representatives will get back to you promptly. Just e-mail your message to info@ovalwindowaudio.com

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