Aiphone DB-1SD Hands-Free Sub Master Station
The Aiphone DB-1SD is a sub master station designed for multi-unit residential and office intercom installations using the Aiphone DB series communication platform. It functions as a secondary control point within a distributed intercom network, enabling hands-free two-way communication between stations while providing centralized call management and external device control capabilities.
Overview
The DB-1SD operates as a tenant or secondary master station, allowing all-call communication between stations within the same residence or office environment. It integrates with entrance stations (DA-1DS, DA-2DS, DA-4DS models) and works in conjunction with a primary master station (DB-1MD) to create a scalable intercom architecture. The unit supports both hands-free VOX (voice-operated exchange) operation and push-to-talk simplex communication modes, accommodating different user preferences and deployment scenarios.
Key Features
- Hands-Free VOX Operation: Voice-activated communication without button pressing reduces user friction in fast-paced environments — especially valuable in shared office spaces where occupants need uninterrupted intercom access. Push-to-talk mode is available as an alternative for installations requiring explicit user control.
- Call Tone & Receive Volume Control: Independent adjustment of incoming call tone and conversation audio levels means you can match acoustic conditions in each deployment location — critical when mounting sub stations in open warehouses, loading docks, or offices with varying ambient noise.
- Door Release Integration: Built-in door release button powered by the connected entrance station eliminates the need for a separate relay or external circuit — streamlines installation and reduces wiring complexity on smaller multi-unit jobs.
- External Device Control: Integrated option button supports N/O dry contact relay outputs or AC/DC 24V 1.6A maximum auxiliary device control, enabling integration with third-party systems (lighting, gates, locks) — allows the DB-1SD to function as a control hub, not just an intercom endpoint.
- Optional Call Extension Speaker (IER-2): Distributed audio coverage without installing additional sub stations — deploy a single extension speaker in a hallway or warehouse floor to relay calls to multiple users without expanding the main station count.
- Open Voice Master Design: Open microphone and speaker configuration without handset reduces maintenance points and eliminates the risk of a lost or damaged handset disrupting that station — simpler to deploy and manage over time.
- Integrated Cable Support & Distance Planning: Specifications for 4-conductor low-capacitance PE-insulated cable runs between sub stations (up to 330 feet) and 2-conductor entrance-to-master connections support cumulative power distances up to 1,020 feet at 18AWG. This enables deployments spanning larger facilities — a single power supply and master station can serve entrance stations distributed across a multi-building campus when wire gauges and distances are planned correctly.
Integration & Compatibility
The DB-1SD integrates with the complete Aiphone DB series ecosystem. It connects to the primary DB-1MD open voice master station and works with all DA series entrance stations (DA-1DS, DA-2DS, DA-4DS). The unit supports optional IER-2 call extension speakers for multi-room audio coverage and RY-ES external signaling relays for third-party device activation. The system requires a PT-1211CA 15V AC plug-in transformer or equivalent power supply. When planning a multi-station intercom deployment, wire gauge selection and cumulative distance calculations are non-negotiable — undersizing the cable run or exceeding distance limits will degrade audio quality or cause intermittent communication failures.
Wiring & Distance Specifications
Proper cable selection and distance planning are critical for reliable operation. Entrance-to-master connections require 2-conductor low-capacitance PE-insulated solid non-shielded wire (Aiphone #871802). Master-to-sub connections require 4-conductor cable (Aiphone #871804). Power supply distance limits are 180 feet at 22AWG or 510 feet at 18AWG to master station; cumulative entrance station distance limits are 360 feet at 22AWG or 1,020 feet at 18AWG. When sub stations share power, a 4-conductor plus 2-conductor configuration is specified (Aiphone #822206 or #871804).
Frequently Asked Questions
Q: Can the DB-1SD be installed in an existing Aiphone DB series system?
A: Yes. The DB-1SD works with a primary DB-1MD master station and all DA series entrance stations (DA-1DS, DA-2DS, DA-4DS) already in use. It functions as a secondary control point and does not require replacement of existing hardware.
Q: What's the maximum distance the DB-1SD can be from the master station?
A: Using 4-conductor cable (Aiphone #871804), the sub station supports runs up to 330 feet from the master. Power supply distance to the master is 510 feet at 18AWG or 180 feet at 22AWG. Always verify cumulative entrance station distances to ensure adequate power delivery.
Q: Does the DB-1SD support external door locks or gate controls?
A: Yes. The integrated option button supports N/O dry contact relay outputs or AC/DC 24V 1.6A maximum auxiliary device control, enabling integration with powered locks, gate operators, and other third-party systems.
Q: Can I add a call extension speaker to the DB-1SD?
A: Yes. The DB-1SD supports optional IER-2 call extension speakers for distributed audio coverage. This is useful when you need call alerts in multiple rooms or areas without installing additional sub stations.
Q: What power supply does the DB-1SD require?
A: The system requires a PT-1211CA 15V AC plug-in transformer or equivalent power supply. This single supply can power the master station, sub stations, and entrance stations, provided wire gauges and cumulative distances are within specification.
Ted PerryPerspective based on aggregated IP Security Depot and affiliated engineering team experience.
The Aiphone DB-1SD (often searched as DB 1SD) is a straightforward sub master station — not flashy, but reliable for multi-unit deployments where you need distributed call control without the complexity of a networked IP system. The 2MP resolution spec tells you this is an audio-first intercom platform; video capability is secondary or absent, which is fine for most residential and office buildings that don't need camera feeds at every call point.
Technical Highlights:
- 4-Conductor Cable Support to 330 Feet: This distance constraint means you can't wire a single sub station across a sprawling campus — plan for multiple master stations or use extension speakers (IER-2) if you need audio in distant areas without adding sub stations.
- Cumulative Power Distance of 1,020 Feet at 18AWG: A real advantage for larger buildings: a single 15V AC transformer can power the entire system (master, subs, and entrance stations) if you size the wire correctly. Many integrators underestimate this and run into voltage drop issues — calculate carefully before ordering cable.
- 24V 1.6A Auxiliary Relay Output: Enough to trigger a solenoid door lock or gate operator, but not enough for heavy-duty industrial devices. Know your load before speccing the auxiliary control — a gate motor may require a separate relay or power supply.
Deployment Considerations:
- VOX mode eliminates the need for users to press a button, which speeds up operations in shared spaces — but it can also lead to accidental transmissions or feedback loops if acoustic conditions are noisy. Test VOX sensitivity in your deployment environment before final commissioning.
- The absence of video on the sub station itself means you're relying on separate entrance cameras or external security — the DB-1SD is intercom-only. If you need visual verification of who's calling, you'll need to integrate a separate video entry system.
The DB-1SD fits best in multi-unit residential buildings, small office complexes, and managed access scenarios where call routing and door release are the primary concerns. It's not overkill, and it's not cutting corners — it's a reliable workhorse for traditional intercom jobs.
