Aiphone AX-B Semi-Flush Indoor Sub Station

Overview

The Aiphone AX-B is a semi-flush mounted indoor sub station engineered for hands-free intercom communication in multi-unit residential, commercial, and institutional installations. Built on the proven AX Series platform, the AX-B (often searched as AX B) integrates seamlessly with Aiphone master stations and door units, delivering reliable two-way audio across extended wiring distances up to 980 feet. The semi-flush mounting profile suits modern architectural environments where surface-mounted aesthetics are not preferred, while the durable ABS plastic construction ensures long-term durability in indoor environments.

Key Features

• Hands-Free Communication: Automatic audio activation when the master station answers, eliminating manual call acceptance at the sub station
• PoE+ Power (802.3at): Single Power over Ethernet+ connection eliminates the need for dedicated 24V DC power supplies and separate control wiring runs
• Cat-5e or 2-Conductor Wiring Compatibility: Flexible wiring architecture supports standard Cat-5e network cable or traditional 2-conductor telephone wire, reducing retrofit complexity in existing buildings
• Extended Wiring Distance: Supports communication runs up to 980 feet, enabling deployment in large floor plates and multi-building campuses without intermediate amplification
• Semi-Flush Mount Design: Recessed installation profile minimizes protrusion from wall surfaces, offering a cleaner aesthetic than surface-mounted alternatives
• ABS Plastic Construction: Durable polymer housing withstands typical indoor wear and maintains appearance in high-traffic areas

Integration & Compatibility

The AX-B is designed as a sub station component within the Aiphone AX Series ecosystem. It operates with AX Series master stations including the AX-8M Audio Master (supports up to 8 masters and 8 sub stations) and the AX-8MV Audio/Video Master, as well as the AX-8MV-W white variant. For expanded door coverage, the AX-16SW Master Station Add-On Selector enables control of up to 16 doors. The sub station integrates with complementary AX Series outdoor door stations (audio mullion-mount AX-DM and video surface-mount AX-DV variants) and alternative indoor sub stations (AX-A surface mount and AX-AN surface mount with privacy). System configurations scale from single-master installations to multi-master architectures using the appropriate selector modules.

Wiring and Installation

Installation requires Cat-5e or 2-conductor wiring routed from the master station to the sub station location. The semi-flush mount configuration requires cavity preparation in drywall or similar substrates. PoE+ power delivery via Cat-5e enables single-cable installations where network infrastructure is available, simplifying rough-in and reducing low-voltage trade coordination. Traditional 2-conductor wiring supports installations in buildings where Cat-5e is unavailable or where legacy telephone infrastructure is being repurposed.

Marty Allison

The Aiphone AX-B delivers practical, no-frills intercom functionality for multi-unit residential and light commercial buildings where hands-free operation and clean aesthetics matter. I've specified this unit in senior housing communities and office buildings where the semi-flush profile prevents damage in corridors and the PoE+ power model eliminates costly 24V runs.

Technical Highlights:

• PoE+ Efficiency: 802.3at power delivery consolidates audio and power into one Cat-5e conductor, reducing installation labor by 30–40% compared to two-wire plus separate power drops
• 980-Foot Reach: Extended wiring distance supports single master stations covering entire floors in mid-rise buildings without signal degradation or intermediate repeaters
• Hands-Free Architecture: Automatic audio activation on master answer eliminates user confusion and supports compliance with accessibility standards in multi-tenant buildings

Deployment Considerations:

• Semi-flush mounting requires accessible wall cavity or ceiling space during rough-in; verify structural compatibility before committing to installation locations
• In retrofit scenarios, 2-conductor wiring option allows reuse of existing telephone infrastructure, but PoE+ via Cat-5e is preferred for new installations due to lower installation cost and future network convergence
• Pair with AX-16SW selector module if your layout requires more than 8 door stations; master-to-sub station count scales independently from door count

For security integrators and IT managers overseeing building-wide intercom standardization, the AX-B offers reliable, code-compliant audio with a minimal footprint and straightforward wiring. Specify it where semi-flush aesthetics align with your customer's design standards and PoE+ infrastructure is available.