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Overview

The D7-2-Dante Digital Hearing Loop Amplifier represents the global benchmark for digital audio induction loop systems. Featuring all the benefits of the Standard D14-2 driver with added Dante Input for additional Network Audio.

The D Series range consists of 4 class ‘D’ drivers (3 dual loop output and 1 single output models); meaning a 60%+ increase in energy efficiency over existing solutions. Drivers feature capacitive touch front panels with intuitive menus, built-in test signals, and are fully networkable with a Wi-Fi accessible standard browser-based control panel for remote set-up, monitoring, and email alerts.

The D7-2-Dante features 7 Amps per loop output respectively plus ample voltage headroom, making it the most flexible solution on the market, suitable for a huge range of applications.

In another first for high-power Class D Induction Loop drivers, installation can be performed with total confidence, as unique multi-stage filtering ensures compatibility with both other system equipment and global EMC regulations. The D Series also boasts Dual slope Metal Loss Control that caters for a wide range of metal loss frequency characteristics.

Includes

One (1) D7-2-Dante D Series MultiLoop™ Driver (7 Amps x 2) – Dante
One (1) 1U 19″ Rack Mount (brackets included)
One (1) Handbook and installation instructions
One (1) T-Coil Loop System present Sign (deaf logo)
Two (2) Neutrik NL4 output connectors for each output
One (1) Region specific IEC power cable
One (1) Status and DC Connectors

Highlights

  • Dante Input for additional Network Audio
  • Single or dual output options. Dual outputs featuring accurate and stable 90° phase shift
  • Networkable with remote browser interface
  • Digital display & intuitive ‘touch’ menu system – 3 modes; Main, Status & Quick
  • Highly energy efficient Class-D amplifiers with low heat dissipation
  • Up to 2 x 650m2 Perimeter Loops area coverage
  • Up to 3,300m2 MultiLoop™ Low Loss area coverage
  • Compact 1U rack mount unit with internal transformer for simple rack installation
  • Optimised for speech frequencies with unmatched intelligibility & capable of high quality musical reproduction
  • AGC & Dual Slope MLC
  • Active status monitoring & remote fault reporting via email
  • Data compliant with: IEC 62489-1 Standard
Configurations & Architectural Specs

Configurations

D7-2-Dante D Series MultiLoop™ Driver (7.0 Amps x 2) – Dante

Architectural Specs

The D Series MultiLoop™ Driver shall continuously deliver two (2) x 7.0 A(RMS) per channel when excited with a 1 kHz sine wave as measured with the IEC 62489-1 induction loop amplifier performance standard. Only drivers that have been tested and compliant to this IEC 62489-1 specification shall be accepted, no other substitutions will be allowed.

In a Perimeter Loop application it shall cover up to two (2) x 650 sq. m (6997 sq. ft.) each. In a MultiLoop Low Loss application it shall cover up to 3,300 sq. m (35,520 sq. ft.). The MultiLoop driver shall internally incorporate two (2) loop drivers and one (1) accurate and stable 90° audio phase shifter. The MultiLoop driver with the proper design shall have reduced spill to no more than 1.5 m (4.9 ft.). The MultiLoop driver shall have a frequency response of at least 80Hz to 6.5kHz +/- 3 dB with THD+N less than 0.2%. The unit shall incorporate (AGC) Audio Gain Control optimized for speech with a compression dynamic range of >36 dB audio processing. The unit shall incorporate Dual Slope Metal Loss Correction to rectify frequency loss caused by adjacent metal structures. The unit shall incorporate built in test signals and shall be fully networkable with a Wi-Fi accessible standard browser based control panel for remote set-up, monitoring and email alerts. The unit shall include a specific network RJ45 input connection enabling Dante plug and play network audio. The unit shall occupy one rack space and rack mount brackets shall be included. The MultiLoop driver is tested to and compliant with: IEC 62489-1 induction loop amplifier performance standard.

The D7-2-DANTE D Series MultiLoop™ Driver (7.0 Amps x 2) – DANTE is specified.

Qualification and Certification of the Contractor Only AV Integration Firms/Dealers that have completed and are currently certified under specific manufacturer training to test, install, and commission along with providing a Certificate of Conformity in accordance with the IEC 60118-4 standard shall be eligible to bid upon this portion of this bid.

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Standard Compliance

This product is designed to form part of a system that can meet all of the requirements of the international loop performance standard IEC60118-4, and the relevant parts of BS7594. To fully meet requirements of these standards, correct design, installation, commissioning and maintenance are required. All specification data has been compiled in accordance with IEC62489-1, the international standard for audio frequency induction loop equipment. Specification data should only be compared with data compliant to this standard.

Product Specifications
Specification D7-2-Dante

Audio

Frequency Response 80 Hz to 6.5 kHz
Distortion THD+N < 0.2 %, 1 kHz sine wave at full current
AGC Optimized for Speech, Dynamic Range > 36 dB
Metal Loss Correction Corrects system frequency response due to metal structures in a building. Gain constant at 1kHz, adjustable gain slope from 0 to 4dB per octave in 0.25dB increments. Custom 2 slope MLC allows different slopes and transition frequency to be set via the menu.This does not compensate for signal loss from metal structures which can be significant.
Phase Shift User selectable at 0° or 90° between outputs

Interconnections

Slave I/O 6.35mm jack socket for linking more than one amplifier.Inserting plug disables other inputs
Loop Connector/s Channels A / B, Neutrik NL4 Speakon, Drive Current: 14 A (RMS), 19.8 A (Peak) up to 60 seconds continuous 1 kHz sine wave, peak > 19.8 A per channel, Cont. pink noise 6.6 (RMS), short term peaks > 20 A per channel, Drive Voltage: 33.9 V (RMS), 45 V (Peak) at maximum output current per channel
Loop Monitor Connection Provides access to monitor actual loop current via a 3.5mm stereo headphone connector on front panel Channel A on left, channel B on right
Input 1 XLR balanced inputs, switchable between microphone and line via panel menu:Microphone specification; 200 - 600 ?, sensitivity -64 dBu.Selectable 12 V phantom power on microphone only.Line sensitivity; -39 dBu, Input Impedance = 17k?
Input 2 XLR balanced inputs, switchable between microphone, line and AES via panel menu:Microphone specification; 200 - 600 ?, sensitivity -64 dBu.Selectable 12 V phantom power on microphone only.Line sensitivity; -39 dBu, Input Impedance = 17k?
DC Output Resettable, fuse protected 12V 0.1A. Operation can be configured via menu.

Loop

Loss Control Phased Array - Coverage No Metal (0dB): 3,300 m² (35,520 sq. ft.)Moderate Metal Loss (-5dB): 925 m² (9,956 sq. ft.)High Metal Loss (-10dB): 400 m² (4,305 sq. ft.)Severe Metal Loss (-15dB): 180 m² (1,937 sq. ft.)
Low Spill Phased Array - Coverage No Metal (0dB): 1,225 m² (13,185 sq. ft.)Moderate Metal Loss (-5dB): 700 m² (7,535 sq. ft.)High Metal Loss (-10dB): 340 m² (3,659 sq. ft.)Severe Metal Loss (-15dB): 120 m² (1,291 sq. ft.)
Perimeter Loop - Coverage No Metal (0dB): 1:1 Aspect Ratio 2 x 1,300 m² (13,993 sq. ft.), 3:1 Aspect Ratio 2 x 1,145 m² (15,607 sq. ft.)

Power

Power 120 VAC, 160 W, 45 - 65 Hz, Power Switch on front panel

Physical

Mounting Freestanding or 1U 19" rack mount (brackets included)
Dimensions (H x W x D) 44 x 430 x 290 mm (1.74 x 16.93 x 11.42 in.)
Weight 6.9 kg (15.3 lbs.)
Shipping Weight 8.26 kg (18.3 lbs.)

Environmental

Temperature - Operation 0 C (32 F) to 35 C (95 F)
Relative Humidity 20 to 90% Relative Humidity
Standards IP20 Rated

Compliance

Marks and Approvals CE and ETL Listed
FAQ
Q Should I purchase a field strength meter?
A 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 (R1), (FSM) or a receiver with field strength indication (IR-IL-1).
Q What is the warranty on the D Series Drivers?
A The D Series Drivers have a 5 year limited manufacturer's warranty.
Q What is an array system and how do I design one?
A 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.
Q What audio input should I use on an induction/hearing loop?
A 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.
Q Which type of cable should I use for an induction/hearing loop?
A 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.
Q What is spill or overspill?
A 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.
Q How do you minimize overspill?
A 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.
Q What is metal loss correction?
A 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.
Q Why do loop drivers have extensive audio processing?
A 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.
Q Why is it important for a loop driver to be ‘constant current’?
A 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.
Q How do I choose which loop driver is best for my installation?
A 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 a Hearing Loop System Guide and Listen support to help you specify and design your system.
Q When should I use a perimeter loop system and when do I need an array?
A 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.
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