01 Sep LDA launches Mini ONE: EN 54 voice evacuation and PA without oversizing your project
LDA Audio Tech expands its portfolio with the new Mini ONE, a compact public address and voice evacuation system certified to EN 54-16 and EN 54-4, designed for installations with up to two audio zones. The new ONE-150 model addresses a common challenge: meeting the standard without going beyond what the project actually needs in terms of power or functionality.
A series that keeps growing towards smaller installations
The ONE series was built to make certified voice evacuation accessible in medium and small-scale projects. Mini ONE takes that approach one step further, fitting naturally into environments such as retail premises, sports centres, low-occupancy public buildings and franchise networks.
It shares the same design principles as the rest of the series: compact format, flexible installation in Wall & Rack configuration (rack, desktop or wall mount) and straightforward integration in spaces with physical constraints.
Typical use cases
In small-format retail, the ONE-150 enables the deployment of a standalone system per location without any need for interconnection between units. The absence of cascading reduces design complexity and makes it easier to standardise the project across multiple sites.
In dual-purpose spaces such as cultural venues or multipurpose halls, the two-zone configuration allows evacuation announcements and background audio to be managed separately, without additional amplification equipment. This simplifies both the cabling layout and ongoing maintenance.
In projects with space or technical infrastructure constraints, such as small public buildings, the Mini ONE architecture with integrated main/backup amplification eliminates the need for auxiliary racks or external redundant systems, while maintaining EN 54-16 compliance within a single unit.
Technical features focused on efficiency and compliance
The ONE-150 integrates two Class D amplification channels with a maximum output of 150 W per EN 60065, in a main/backup configuration. This ensures system continuity in the event of a failure, meeting EN 54-16 requirements.
It supports either an A/B zone layout or two fully independent zones, with speaker line supervision and end-of-line supervision terminators.
Key technical features:
3 audio inputs with priority levels and mixed input.- 2 pre-amplified outputs for external amplifiers.
- Integrated DSP with parametric equaliser, loudness control and per-zone volume adjustment.
- Dual EVAC and ALERT pre-recorded message player (up to 10 minutes of memory).
- Fire detection panel integration via 4+2 supervised GPIO ports and Modbus RTU.
- Local control via LCD display, no external software required.
- Compatible with up to 8 MPS-8Z microphones or VAP-1 panels over CAT5 UTP.
Download the Mini ONE technical documentation from the LDA support area: product datasheet, user’s manual, certificate, firmware and images.
Mini ONE, backed by the ONE series ecosystem
The Mini ONE launch is accompanied by two developments that extend the capabilities of the entire ONE series.
The first is NEXO integration via NEXO Hub Lite, a feature included as standard with no additional licence cost. It allows ONE-150 and ONE-500 systems to be incorporated into multisite architectures alongside NEO and NEO+ systems, with NEXO acting as a gateway between each local system and the IP network. In this way, small standalone installations can become part of a shared infrastructure without losing their local operation.
A single installation can combine different LDA platforms under one global control point: for example, NEO+ in common areas and ONE in each unit of a franchise network or airport duty free outlets.
The second is EVAC Control ONE, the centralised management and supervision platform for the ONE series. Via native RS-485 connection, it enables ONE-500 and ONE-150 units to be controlled and monitored from a single workstation, with real-time system status supervision and fault detection. It includes global Automatic Gain Control (AGC), integration with generic analogue equipment and Quick Launcher, a function for the rapid execution of pre-configured actions that supports compliance with the response procedures required under Martyn’s Law in the UK. EVAC Control ONE will be available from October 2026.
A standalone system that simplifies the project
Mini ONE is designed for installations with one or two zones that do not require cascaded connections. This approach reduces design complexity, speeds up commissioning and minimises installation errors.
For larger requirements, the ONE-500 covers up to six zones. For more demanding projects, the NEO+ series offers a scalable architecture for larger installations.
For the installer, the conclusion is straightforward. EN 54 compliance in small projects is now achievable with a right-sized solution, without oversizing the system.
FAQ: LDA Mini ONE, EN 54 public address and voice evacuation for small installations
What is Mini ONE? Is it the same as the ONE-150?
Yes. Mini ONE is the commercial name for the LDA ONE-150. The ONE-150 code identifies the product in price lists, orders and technical documentation, while Mini ONE is the name used for commercial and marketing purposes within the ONE series.
Is Mini ONE EN 54 certified?
Yes. The LDA ONE-150 complies with EN 54-16 (voice alarm systems) and EN 54-4 (power supply equipment). The battery module is included within that certification, although activation is optional and requires a µSD card.
How many zones does the ONE-150 support?
The ONE-150 supports up to 2 audio zones. It can be configured as a single A/B zone or as two fully independent zones. This number cannot be increased by connecting units in cascade.
What is the difference between the ONE-150 and the ONE-500?
The main difference lies in power output and zone capacity: the ONE-500 delivers 500 W across up to 6 zones, while the ONE-150 reaches 150 W with a maximum of 2 zones.
Does Mini ONE include a backup amplifier?
Yes. The system incorporates two Class D amplification channels in a main/backup configuration, ensuring evacuation system continuity in the event of amplifier failure. This is a mandatory requirement for EN 54-16 certified systems.
Does it require external software to operate?
No. Mini ONE is controlled entirely via its LCD display, with no external applications required for standard operation. Integration with fire detection panels is handled through supervised GPIO ports and Modbus RTU protocol.
Can it be rack-mounted?
Yes. The ONE-150 supports rack, wall and desktop installation. Its dimensions of 453 × 88 × 455 mm make it straightforward to integrate in technical enclosures where space is limited.
Is the ONE-150 compatible with multisite architectures?
Yes, via NEXO Hub Lite, a feature included as standard in the NEXO device at no additional licence cost. It allows ONE-150 and ONE-500 systems to be integrated into multisite architectures alongside NEO and NEO+ systems, with centralised control from a single global point.
Is there a centralised management platform for the ONE series?
Yes. EVAC Control ONE is the supervision and control platform for ONE-500 and ONE-150 systems. It enables centralised monitoring of system status, fault detection and volume management via RS-485 connection. Available from October 2026.