The XA88 Large Transport Vehicle Induction Loop Driver has reached End of Manufacture and is superseded by the T14-1 Transport hearing loop driver for rail and the T14-1 Transport hearing loop driver for bus and coach.
Compare the T14-1 to the XA88 here.
There is also a transition guide available here: T14-1 to XA88 Transition Summary
If you have any questions regarding the T14-1 or support for the XA88 please contact us on +44 (0) 1636 610062
The XA88 is a specialist Hearing Loop driver, designed for use bus, rail and other transport vehicles. The unit is designed for the OEM and vehicle engineering customer, to be integrated into public address and passenger communication systems on board the vehicle. It is backed by Ampetronic’s 5-year warranty and experienced specialist technical support.
The unit has two balanced transformer-isolated inputs (for connection to line-level sources or intercom/PA speaker systems), and provides superior sound quality with metal loss frequency response correction. The XA88 meets EMC and environmental standards for use on rail and automotive vehicles. With power supply options to suit many common rail and commercial vehicle power systems, and remote enable and status interfaces for more complex applications, it is the obvious choice for any quality on-board audio system that requires an Audio Induction Loop.
N.B. The XA88 Large Transport Vehicle Induction Loop Driver requires a detailed application review by Ampetronic to ensure compatibility with vehicle design for optimum operation.
Product Code: XA88 (A DC power supply option, 24V, 72V, 110V ,will need to be selected when ordering)
In a rail vehicle or bus, the floor, walls, and roof are all usually metal. To keep away from metal sheets near the plane of the loop (and thereby minimise loss of energy), it is most common to place the loop around the upper part of the wall, typically 1.8m to 2m above floor level. This is usually some 300mm below the roof height. The best location will depend on the exact vehicle design.
Most transport vehicles have metal construction – the bodyshell is usually metal panels with frames and structural supports. Although the interior may use non-metal panels, an induction loop installed inside such a vehicle will experience significant loss of energy and changed frequency response.
The XA88 has sufficient loop drive capacity to overcome the loss of loop signal in most cases. The unit’s metal loss compensation will correct the frequency response up to 4dB/octave slope.
Each vehicle design has a different metal construction, and so the metal loss will be different. The only reliable way to determine the metal loss – which determines the loop current – is to measure the performance of a trial loop installation in the same or a very similar design of vehicle.
Ampetronic can provide site survey services to help you conduct a trial installation and effectively measure the proposed system’s performance. We can also provide a package of project services, carrying out commissioning or troubleshooting as required. Measurement instruments are available to help you or your customer to regularly test the installed loop’s performance.
Product code:
XA88
Rail:
The XA88 is compliant with rail standard BS EN 50155:2017 and associated standards including BS EN 50121-3-2:2016 (EMC) and EN 61373:2010 (shock and vibration). In addition, the XA88 is compliant with EN 45545-2:2013 (Smoke and Fire behaviour) to HL3.
Automotive:
The 24V variant of the XA88 is compliant with automotive regulation EN/ECE R10 encompassing the requirements of EN 50498:2010.
Loop Performance
The XA88 will enable an Audio Frequency Induction Loop system that meets the requirements of EN 60118-4 to be created, if the system is specified, installed and commissioned in an appropriate manner, including observing Ampetronic instructions.
| Power Supply | Options for 24V, 72V or 110V DC (other voltages possible) – see details above Indication: LED on front panel Connector: MIL-C-5015 (2 pins of CON3) |
| Safety Ground | M6 chassis stud (nut & star washer supplied) |
| Signal Inputs | Quantity: 2 (3 to special order – ask for details) Typical Source: Intercom / PA line – see details on left for levels Format: Balanced, transformer isolated 1500V Level selection: In connector, by alternate pin choice Adjustment: Front Panel control, per channel Connector: MIL-C-5015 (10 pins, CON1) |
| Enable Inputs | Quantity: one per input Format: Opto-isolated 1500V from internal circuits (enables have common external reference) Level: 5-24V DC enables relevant input. Input load: 3.4mA@5V, 16mA@24VDC Connector: MIL-C-5015 (4 pins of CON2) Indication: LED per channel on front panel |
| Loop Output | Includes configurable output transformer. Values shown at 1.67:1 ratio Voltage: 7.1Vrms (11Vpk) at max. drive current Current (max): > 11Arms (15.5Apk) with 1kHz sine Current (short term): 21Apk absolute max Current Adjustment: Front panel control Current Indication: LED on front panel Connector: MIL-C-5015 (2 pins of CON3) |
| Loop Impedance | Up to 0.49Ω reactive at 1.6kHz, with transformer ratio 1.67:1 |
| Monitor/Status | Isolated contact, closed when power present & no fault Isolation: 1000V AC 50/60Hz Contact rating: 1.25A 24V DC or 0.4A 125V AC Connector: MIL-C-5015 (2 pins of CON2) |
| Protection | Thermal: Heatsink 90 to 125°C: output reduces by up to 3dB Heatsink >125°C: output muted. Amp Fault LED Illuminated * Output DC Offset: Isolates output if >±0.7 Amp – Fault LED Illuminated * Output clipping: If continuous, Loop Fault LED illuminated * Status relay: Contact opens when any item marked * is detected or power fails |
| Freq. Response | 100Hz to 5kHz ±1.5dB relative to 1kHz at -12dB re: max output, measured as loop current with no metal loss correction. |
| Compression | Response optimised for speech Dynamic range: >30dB input, ±1dB output over input range Control: By adjusting input level/gain Indication: LED on front panel Attack / Decay: 7ms / >1s |
| Metal Loss Correction | 0dB to 4dB / octave boost Adjusted on front panel control |
| Dimensions | Width 251mm, depth 320mm, height 89mm excluding connectors |
| Weight | 5kg |
| Construction | Aluminium, powder coated. IP43 when mounted correctly, IP65 option available. <95% relative humidity, -40°C to +70°C (EN50155 TX) Installed unit should be mounted where the heat of normal operation can be dissipated by airflow through the rear heatsink. |
TheXA88 is supplied in 3 DC voltage versions:
| Nominal voltage | 24V DC |
| Voltage range | 14.4 – 33.6V DC |
| Coupling | Direct – no power converter |
| Overcurrent Protection | Internal replaceable fuse, T 4A L |
| Power Consumption | 61W (2.54 A) continuous audio 6W (0.25 A) quiescent 150W (6.25 A) short-term peak (at full 1kHz sine output) |
| Nominal voltage | 72V DC |
| Voltage range | 43 – 108V DC |
| Coupling | Isolated – uses power converter |
| Overcurrent Protection | Current foldback in power converter & non-replaceable 7A fuse in converter |
| Power Consumption | 70W (0.64 A) continuous audio 10W (0.14 A) quiescent 150W (2.08 A) short-term peak (at full 1kHz sine output) |
| Nominal voltage | 110V DC |
| Voltage range | 65 – 150V DC |
| Coupling | Isolated – uses power converter |
| Overcurrent Protection | Current foldback in power converter & non-replaceable 5A fuse in converter |
| Power Consumption | 70W (0.64 A) continuous audio 10W (0.09 A) quiescent 150W (1.36 A) short-term peak (at full 1kHz sine output) |
Input 1 |
Low level |
High Level |
| Input Impedance | 3.6kΩ | 120kΩ |
| Sensitivity | 16dBu (130mV rms) | +15dBu (4.2V rms) |
| Overload: | > +19dBu (7.3V rms) | > +49dBu (236V rms) |
Input 2 |
Low level |
High Level |
| Input Impedance | 3.6kΩ | 36kΩ |
| Sensitivity | -16dBu (130mV rms) | + 4dBu (1.3V rms) |
| Overload: | > +19dBu (7.3V rms) | > +39dBu (73V rms) |
| Input 3 | Optional – not normally fitted. Details to customer requirement |
The XA88 uses MIL-C-5015 connectors for proven reliability.
| CON 1 | Signal Inputs | 10-pin 18-1 insert |
| CON 2 | Enable & Status | 6-pin 14S-6 insert |
| CON 3 | Power in & Loop out | 4-pin 14S-2 insert |
Chassis connectors on the unit are pins in a male shell.
Mounting Bracket or Tray
A mounting can be supplied for the XA88 in your project, subject to agreement of a suitable design. Previous projects have used a rack tray or an asymmetric bracket arrangement to match the available mounting space. Please contact Ampetronic to discuss the options.
Connectors
Mating MIL-C-5015 style connectors can be supplied as an optional part. Please contact Ampetronic for further details. If you require accessories not shown here, please contact Ampetronic to discuss your requirements.
Dublin, Ireland
A reliable induction loop system that allows a T-coil enabled hearing aid to pick up announcements clearly.
Nottingham, United Kingdom
XA88, CLS2-R1
