Aiphone GT-1A Audio Tenant Station
The Aiphone GT-1A is an audio-only tenant station engineered for multi-unit residential and commercial entry systems. Designed for surface wall mounting with a compact, streamlined profile, the GT-1A delivers reliable hands-free and push-to-talk audio communication between tenants and entrance panels, concierge stations, or security guard stations. Its straightforward feature set and simplified 2-conductor common bus wiring make it an economical choice for properties requiring audio-only intercom endpoints without video capability.
Overview
The GT-1A operates on 24V DC power supplied from the Aiphone GT-BC power supply, meaning you don't need to run separate 110V AC lines to each station — a real advantage in retrofit projects where adding dedicated power circuits would drive installation costs up. It supports up to 4 tenant stations per resident location, enabling distributed audio communication throughout multi-unit properties without requiring parallel wiring runs. The unit is equipped with a built-in speaker and microphone, along with dedicated talk, door release, and optional service buttons. Communication mode selection between hands-free (VOX) mode and push-to-talk (simplex) operation allows flexibility to match installation requirements and tenant preference. The station receives varying ring tones from the entrance panel, concierge, or doorbell to notify residents of incoming calls.
Installation simplicity is a primary selling point: the GT-1A uses a common bus architecture with 2-conductor, PE-insulated solid conductor cable (Aiphone #872002), reducing material cost and installation labor compared to multi-conductor systems. For properties with existing Cat5 or multi-pair infrastructure, you can still deploy the GT-1A without replacing those runs — just use two pairs and cap the rest.
Key Features
- Hands-Free and Push-to-Talk Modes: VOX (voice-activated) mode enables automatic two-way conversation without pressing a button — useful in busy corridors or when tenants' hands are full. Push-to-talk simplex mode requires a button press, conserving audio bandwidth and reducing cross-talk in high-density multi-unit buildings where audio quality matters.
- Door Release Integration: One-touch door release button provides direct control to the door where communication is established, enabling tenants to grant visitor access without leaving their unit or walking back to an entrance speaker station.
- Concierge/Security Guard Calling: Dedicated button allows tenants to call security, concierge, or guard stations independently of entrance panel calls — essential in large properties where tenants need to reach a live person for package delivery disputes, maintenance requests, or parking issues without triggering the main door intercom.
- Optional Service Button: Secondary option button triggers a normally open contact on the back of the unit, enabling activation of external devices such as emergency alert systems or auxiliary relays. This is valuable if you're integrating the GT-1A with a broader security or building management system.
- Individual Doorbell Notification: Optional unique tone assignment notifies residents when someone is at their specific door, improving response times in large properties where a single bell tone is ignored or missed. Particularly useful in 50+ unit buildings where residents need clear identification of which door has a visitor.
- Exterior Lighting Control: Optional capability to activate outside lighting while speaking with visitors at the entrance, improving visibility and security during evening hours without requiring the tenant to walk to a separate switch or use a mobile app.
- Separate Volume Controls: Independent adjustment of call tone and communication audio levels accommodates varying acoustic preferences and hearing requirements across tenant populations — a critical feature in senior housing or mixed-use residential environments.
- Panic Call Integration: Supports optional emergency call stations (such as Aiphone GFK-PS panic switch), receiving emergency tones and routing urgent calls to concierge stations. This layer adds value if your property has a security operations center (SOC) or 24/7 staffing.
- Simple 2-Conductor Wiring: Common bus architecture uses 2-conductor, solid non-shielded PE-insulated cable, reducing installation complexity and material costs compared to multi-conductor systems. In a typical 4-unit building, you eliminate 50% of the cable compared to a 4-conductor system.
- Compact Wall-Mount Design: Mounts in standard 3-gang electrical box (dimensions 6-7/8" H × 4-15/16" W × 1-1/4" D) or on flat surfaces using optional MCW-S/A desk mount adapter, integrating seamlessly into residential interiors without requiring large wall cutouts or custom framing.
Integration & Compatibility
The GT-1A is purpose-built for the Aiphone GT series ecosystem. It connects via the 2-conductor common bus to entrance panels, master stations, and other GT-series endpoints. Power is distributed from the Aiphone GT-BC power supply, which handles the 24V DC regulation for up to 4 tenant stations per location. If you're installing multiple tenant stations in a single unit (e.g., one in the living room, one in the kitchen), the GT-1A supports this configuration without additional power supplies.
The optional service button contact (normally open relay) can be wired to trigger external devices — lighting relays, emergency alert circuits, or building management system inputs. This opens integration possibilities if you're adding audio-only intercom to a property that already has separate lighting or emergency systems.
Frequently Asked Questions
Q: How many GT-1A stations can I install on a single property?
A: The GT-1A supports up to 4 tenant stations per resident location. If you have a 10-unit building and want 2 stations per unit (e.g., lobby and apartment), you'll need to plan your wiring accordingly. Check the GT-BC power supply specifications for total current capacity.
Q: Do I need a separate power supply for each GT-1A?
A: No. Multiple GT-1A units share a single Aiphone GT-BC 24V DC power supply via the 2-conductor common bus. This simplifies the power distribution and reduces component cost compared to systems requiring individual power supplies per station.
Q: Can the GT-1A operate in VOX (hands-free) mode in a noisy environment like a lobby?
A: VOX sensitivity can vary with ambient noise. In high-noise areas (lobbies with constant traffic), push-to-talk simplex mode is recommended. The GT-1A allows you to configure this per location, so you could use VOX in quiet residential units and push-to-talk in shared spaces.
Q: What cable should I use for the 2-conductor common bus?
A: Aiphone recommends solid conductor, non-shielded PE-insulated 2-conductor cable (Aiphone #872002). This is standard telephone-grade cable and is less expensive than shielded multi-pair alternatives. Do not exceed the manufacturer's recommended run length without checking the GT-BC power supply specification.
Q: Can the GT-1A control lighting or other devices?
A: Yes, via the optional service button and normally open relay contact on the back of the unit. This can activate external relays for lighting, emergency alert systems, or other building devices. You'll need to wire the contact into your external control circuit.
Q: Is the GT-1A suitable for outdoor installation?
A: No. The GT-1A is an indoor audio station designed for wall mounting in 3-gang electrical boxes or flat interior surfaces. It is not rated for outdoor temperature extremes or weather exposure. Operating temperature is 32–104°F (0–40°C). For outdoor tenant stations, consult the full Aiphone product catalog.
Ted PerryPerspective based on aggregated IP Security Depot and affiliated engineering team experience.
The Aiphone GT-1A is a workhorse audio-only tenant station for mid- to large-scale residential intercom deployments. I've specified this unit on a handful of retrofit projects where adding video stations would have been either cost-prohibitive or unnecessary — tenants just need to buzz visitors in without seeing them. The GT-1A's 24V DC common bus wiring and support for up to 4 stations per resident location keep installation labor reasonable and material costs predictable.
Technical Highlights:
- 2-Conductor Common Bus Architecture: Eliminates the multi-conductor cable run required by many competitors. In a typical 4-unit retrofit where each unit gets one station, you're looking at roughly 50% less cable inventory and pulling time compared to 4-conductor systems. Real savings on a 50-unit property.
- Selectable Communication Modes (VOX and Push-to-Talk): VOX is convenient for quiet residential units, but push-to-talk simplex mode is essential for lobbies or high-traffic areas where background noise would trigger false activation. The ability to configure this per station prevents end-user frustration and reduces false calls to concierge.
- Integrated Door Release Button: Tenants don't have to walk back to an entrance station to buzz someone in. This is a convenience feature that also improves security compliance — residents stay in their units rather than leaving doors propped open while retrieving packages.
- Optional Service Button Relay Contact: The normally open contact can drive external circuits for lighting or emergency systems. This is a quiet integration point if you're layering the GT-1A into a broader building automation setup.
Deployment Considerations:
- No Video Capability: This is not a limitation if your property genuinely does not need video intercom. But if you're uncertain whether tenants will demand video verification in 2–3 years, start with a hybrid approach: audio-only in lower-risk units, video in main lobbies and ground-floor common areas.
- Operating Temperature Window is Indoor-Only: The 32–104°F rating means the GT-1A is strictly for controlled interior environments. Do not mount it in unheated stairwells or partially outdoor vestibules. If you need stations in those spaces, step up to a weather-rated outdoor panel.
- Power Distribution from Single GT-BC Supply: The GT-BC power supply is the single point of failure for all 4 tenant stations on a location. If the supply fails, all audio communication at that location drops. Consider redundancy or a UPS backup if 24/7 uptime is non-negotiable.
- 2-Conductor Cable Distance: There are voltage drop limits on DC power runs. Very long cable runs (100+ feet) from the power supply may require a thicker gauge or a secondary supply unit. Check the GT-BC specification sheet before committing to a single supply for a multi-building complex.
The GT-1A is a solid fit for budget-conscious residential integrators building out multi-unit audio-only intercom systems. If your property doesn't need video, the simplified wiring and cost per endpoint make this unit hard to beat. Just be clear with the customer upfront: audio only, indoor only, and plan for power distribution limits on large deployments.
