Induction Loop Amplifier · EN 60118-4 · Additional Devices
Hearing Loops
An induction loop amplifier engineered for transport applications — platforms, airports, ferry terminals — and public buildings such as schools, offices and courts. Delivers compliant assistive-listening coverage to hearing-aid T-coil users in line with EN 60118-4.
Two chassis variants share identical electronics and performance: a free-standing 1U-style enclosure for rack rooms and equipment cabinets, and a surface-mount enclosure for direct wall installation. Both feature a readable front-panel control interface for parameter configuration and a relay output that reports faults to the parent control system.
500m²
Coverage Area
7.5A
Loop Output @ 1 Ω
EN60118-4
Compliance Standard
ABT-HL7
EN
60118-4
Audio-frequency Induction Loop Systems
60118-4
Loop Type:
TCM (True Current Mode)
Compatibility:
IPI4
Power:
230 VAC mains
Protection:
IP40
Product Overview
Key Features
I/O Configuration
Inputs & Outputs
| Line In | 1 kΩ impedance · −20 dBu sensitivity |
| Microphone | 1 kΩ impedance · −42 dBu sensitivity · 12 V phantom power (selectable) |
| Outreach | >10 kΩ impedance · 0 dBu sensitivity · 24 VDC max 100 mA outreach power |
| Connector (Free-standing) | 3-pin XLR (Mic, Line In) |
| Connector (Surface-mounted) | Phoenix-type pluggable terminals |
| Outreach Connector | 4-pole Phoenix-type pluggable |
| Loop Output Type | TCM (True Current Mode) |
| Loop Output Voltage | 14 V |
| Loop Output Current | 7.5 A at 1 Ω |
| Loop Connector | Phoenix-type pluggable |
| Line Out | 775 mV nominal output voltage |
| Line Out Connector | 3-pole Phoenix-type pluggable |
| Error Output | Relay (3-pole Phoenix-type), 10 dB/octave to 5 kHz zone |
| Metal Loss Compensation | 88 |
Chassis Options
Available Models
Two chassis options share identical electronics and performance — choose by installation method and connector preference.
| ``` | ||
|---|---|---|
| Specification | ABT-HL7-D | ABT-HL7-W |
| Form Factor | Free-standing | Surface-mounted |
| Microphone Connector | 3-pin XLR | Phoenix terminal |
| Line In Connector | 3-pin XLR | Phoenix terminal |
| Dimensions (H×W×D) | 67 × 218 × 280 mm | 298 × 308 × 74 mm |
| Weight | 2.38 kg | 3.25 kg |
| Coverage Area | Up to 500 m² | Up to 500 m² |
| Loop Output | TCM · 14 V · 7.5 A @ 1 Ω | TCM · 14 V · 7.5 A @ 1 Ω |
| Power Supply | 230 VAC mains | 230 VAC mains |
| Best For | Equipment cabinets & rack rooms | Direct wall installation |
Hardware
Technical Specifications
| Performance | |
| Coverage Area | Up to 500 m² |
| Standard Compliance | EN 60118-4 |
| Loop Compatibility | IPI4 |
| Loop Output Type | TCM (True Current Mode) |
| Loop Output Voltage / Current | 14 V · 7.5 A at 1 Ω |
| Metal Loss Compensation | 88 |
| Error Output Response | 10 dB/octave, 5 kHz zone |
| Environmental & Power | |
| Power Supply | 230 VAC mains |
| Operating Temperature | 0 to +40°C |
| Maximum Humidity | 95% non-condensing |
| Ingress Protection | IP40 |
| Material | Steel chassis, painted finish |
| Microphone Phantom Power | 12 V (selectable) |
| Outreach Power | 24 VDC max 100 mA |
Applications
Typical Applications
Transport Hubs
Platforms, ticket halls, airport check-in and departure lounges, ferry terminal waiting areas. Compliant assistive listening for public-address announcements and ticket-counter conversations under the Equality Act and accessibility regulations.
Single ABT-HL7 covers up to 500 m²
Public Buildings
Schools, lecture theatres, courts, council chambers, places of worship and reception desks. Direct integration with existing PA, room microphones, or fixed lectern positions via line-in or microphone inputs with phantom power.
EN 60118-4 / Equality Act compliance
VES Integration
Driven from the dedicated hearing-loop audio output on ABT intercom and PA products (e.g. ICO Frontier 01, ICO Module 01). Error output relay back into the VES supervisory system ensures continuous compliance monitoring.
Direct pairing with ABT VES range
Documentation