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A1000G Phased Array Kit
A1000G-RM

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Highlights

  • Even field strength and frequency response in the presence of metal structures.
  • Even field strength over very large areas
  • Reduced spill to 3-6 ft. (1-2 m) from the loop edge for adjacent rooms or confidentiality
  • Minimizes interactions between complex systems such as theaters and balconies
  • Ideal for assistive listening applications in places of worship, theaters, schools, conference rooms, training facilities and hotels.
  • The A1000G-RM delivers years of trouble free service to ensure venues will never disappoint people with t-coil hearing aids.
  • Each A1000G loop driver continuously delivery of up to 9.2 amps under varying load conditions ensures the driver will operate under a variety of installation conditions.
  • Optimized sound quality and audio processing ensures that people with t-coil hearing aids will be delighted with the experience.
  • Design, installation training, support and certification ensures the loop system meets the demands of customers.
  • Extensive audio and loop options delivers the right solution in a variety of applications.

Overview

An hearing loop array kit provides a solution where a simple loop around the room perimeter will not work. Arrays are the standard solution for buildings with metal structure or reinforcements, or for covering large areas. Arrays can also dramatically decrease the ‘spill’ of the magnetic signal outside of the room, allowing hearing loops to be installed in adjacent rooms and providing an improved level of confidentiality. Arrays can also be used to change the way two loops interfere with each other, providing ways of solving even the most complex installation problems.

The A1000G-RM array kit consists of two ILD1000G loop drivers; one SP5 phaser unit and a rack mount kit. The kit is capable of driving loop areas in excess of 15,000 sqft. (1,400 m²) with an unsurpassed clarity of sound for both music and speech for superior intelligibility. Utilizing a new amplification technology, the ILD1000G loop driver provides the highest output available in a single amplifier, while halving power consumption and heat dissipation.  Based on proven and highly reliable technology it is backed by a 5 year warranty and Listen technical support. Improved power output provides outstanding value without compromise. It boasts all the usual features such as metal loss correction and is compatible with our unique Ultra-low Spill™ technology. The A1000G-RM is a compact and elegant unit suitable for freestanding, wall mounting or rack mounting.

Includes

Two (2) ILD1000G Professional Loop Driver (9.2 Amps)
One (1) SP5 90° Audio Phase Shifter
One (1) RM-1U Rack Mount Tray for 1U Products
One (1) BRP-1U Full-Width Blanking Plate for RM-1U

Architectural Specs

The phased array kit shall, in accordance with IEC60118-4, continuously deliver 9.2 A (RMS) when excited with a 1 kHz sine wave. It shall cover an area of at least 15,000 sqft. (1,400 m²). The kit shall incorporate two (2) drivers and one (1) 90° audio phase shifter. The kit shall have reduce spill to no more than 1.5 ft. (1 m). The kit shall have a frequency response of at least 80 Hz to 6.5 kHz +/- 3 dB with THD+N less than 0.2%. The kit shall incorporate audio processing to maximize the intelligibility for individuals with a t-coil equipped hearing aid. The kit shall incorporate metal loss correction to rectify frequency caused adjacent metal structures. The kit shall occupy one rack space and rack mount brackets shall be included. The A1000G-RM Phased Array Kit is specified.

Specifications

  Specifications A1000G-RM
Audio Frequency Response 80 Hz to 6.5 kHz ±3 dB
Distortion  THD+N <0.2 %, 1 kHz Sine Wave at Full Current
AGC Optimized for Speech, Dynamic Range >36 dB
Gain Control Front recessed input level control
Metal Loss Correction Correct system frequency response due to metal structures
     
Phased Array -Coverage No Metal 15,000 sgft. (1400 m²)
Moderate Metal Loss 7,000 sgft. (650 m²)
High Metal Loss 3,400 sgft. (320 m²)
     
Cable Length 10 AWG Copper Max distance at full current - 624 ft. (190 m)
14 AWG Copper Max distance at full current - 577 ft. (176 m)
18 AWG Copper Max distance at full current - 392 ft. (119 m)
22 AWG Copper Max distance at full current - 218 ft. (66 m)
FB1.8 Flat Copper Tape Max distance at full current - 764 ft. (233 m)
     
Over Spill Required to Achive Low Spill SP5 90° Audio Phase Shifter, 2 ILD1000G Units and Array Design
Array Design Provided by Listen
Spill Distance from Edge of Room 5 ft. (1.5 m)
     
Inputs Power 230/115 VAC, 84W, 45-65 Hz, Power Switch/Led on Front Panel
Power Certification ETL Listed
Microphone Input XLR Balanced, -70 dBu Input, 200-6000 Ohms, +15 VDC Phantom Power
Microphone/Line Input XLR Mic or Line Switchable, -70 dBu Input, 200-6000 Ohms, +15 VDC Phantom Power
Line Input 1/4 in. (6.4 mm), -30 dBu Input, Overload Protected
Slave I/O 1/4 in. (6.4 mm), Insert Point for SP5 90° Audio Phase Shifter, 0 dBu
     
Ouputs Drive Voltage 31.8 V (RMS) at Maximum Ouput Current
Drive Current 9.2 A (RMS), 13.0 A (Peak) with 1 kHz Sine Wave
Drive Current Peaks Short Term >19 A
Drive Current Indication 6-LED Display Front Panel, 2 dB Increments
Loop Connector Neutrik NL4 Speakon
     
Other Fault Monitoring LED Fault Indicators, Overload, Overhead, Loop Error
Remote Fault Monitoring Relay Contacts
Ancillary ± 15 VDC, 0.15 A, Power Outlet to Power Accessories
Cooling Forced Ventilation, Air Intake on Left Panel, Air Ejection at Rear
     
Physical Size 1 RU in 19 in. Rack,  16.9 x 8.7 x 1.7 in. (430 x 220 x 44 mm) (WxDxH)
Mounting Options Freestanding
Weight 8.4 lbs. (3.75 kg)
Environment IP20 Protection, 20 to 90% Relative Humidity, 32 F (0 C) to 95 F (35 C)
     
Specifications are subject to change without notification

Requirements

Used With

Accessories

Support Documents

    • FAQ

    How do I choose which loop driver is best for my installation?
    Generally, this depends on the size of the room, the construction of the building, and the type of loop system you need. Refer to the Designing an Hearing Loop System Guide and Listen support to help you specify and design your system.
     
    When should I use a perimeter loop system and when do I need an array?
    A perimeter loop is the simplest form of loop system requiring a single loop of cable around the area to be used. However perimeter loops cannot be used if (1) other loop systems or areas where t-coil receivers are used are nearer than 3 times the room width (shortest side); (2) the room width is over 15ft and there is significant metal in the plane of the loop, such as reinforcement in a concrete floor. In these cases an array system is usually required. You may be able to conduct a site survey to confirm whether an array is necessary – contact Listen for details.
     
    What is an array system and how do I design one?
    An array uses two loop drivers and an SP5 phase shifter to create two overlaid magnetic fields, capable of accurately controlling the field within and around the loop system. They can be used to prevent ‘spill’ of magnetic field allowing loops to be used in adjacent rooms, and to give good even coverage in areas with metal building structures or complex installations. Arrays need a special layout design that can be provided by Listen. Arrays will always give a better field coverage and higher certainty of excellent performance than a perimeter loop, however the installation is more demanding and requires loop cables to cross the floor or ceiling of the area of use.
     
    What audio input should I use?
    Either an existing audio system can be used, or a dedicated microphone or other audio source may need to be provided. The objective is to ensure the loop system receives the required audio source (e.g. a voice) and not any background noise. The most essential job of any assistive listening system is to increase the level of the signal (the voice) relative to the background.
     
    Why is it important for a loop driver to be ‘constant current’?
    A current drive or constant current driver will deliver a current to the loop that is independent of the loop impedance. A normal audio amplifier will not be able to deliver constant current into a loop, meaning lower output at higher frequencies where the loop impedance is higher. A constant current driver can deliver flat frequency response, essential for delivering intelligible sound and performance that meets the loop performance standard.
     
    Which type of cable should I use?
    For cable intended to go under a carpet, you should use 1.8mm2 flat copper tape.  Otherwise, you should choose the cable based on the maximum total cable length in the specifications chart.
     
    What is spill or overspill?
    Overspill occurs when the magnetic field created by hearing loop can be heard outside of the looped area (such as a room).  The field is “spilling” outside of the looped area and can affect other nearby loop systems.
     
    How do you minimize overspill?
    This is done by using an array, consisting of two loop drivers and a SP5 phase shifter that controls the field within the looped area and reduces it rapidly outside the loop perimeter. The overspill can be reduced to as little as 5 ft (1.5m) with a good design.
     
    What is metal loss correction?
    Many buildings have embedded metal in the structure such as reinforcements in concrete, metal computer floors or suspended ceiling grids.  This metal causes a distortion of the frequency response if the metal is in the same plane as the loop cable.  The metal loss correction equalizes the audio to make up for or “correct” this loss. Note that metal loss will also reduce the signal level in general, and may require additional power, or indeed an array system to achieve the right level of performance.
     
    Why do loop drivers have extensive audio processing?
    Because the people who benefit from hearing loops (individuals with t-coil hearing aids), have limited dynamic range due to hearing loss.  Thus, these users require significantly reduced dynamic range so they can hear the softest of sounds and so that very loud sounds are brought to nominal level.
     
    Should I purchase a field strength meter?
    Absolutely, it’s the only way you’ll be able to determine if a loop system is operating properly. Any venue that owns and operates a loop system should also have some equipment to monitor the operation of the loop on a regular basis. This should either be a field strength meter (FSM) or a receiver with field strength indication (IR-IL-1).