Aiphone DB-1MD Open Voice Master Station
Overview
The Aiphone DB-1MD is an open voice master station designed for residential and office intercom systems. As part of the Aiphone DB Series, the DB-1MD serves as the central communication hub, enabling hands-free operation across multiple stations with integrated door release functionality and flexible signaling options.
Key Features
- Hands-Free Operation: VOX (voice-activated) communication for seamless two-way dialogue, with push-to-talk (simplex) alternative for flexible deployment scenarios
- Door Release Control: Integrated door release button powered directly by the entrance station, eliminating need for separate power circuits
- Multi-Station Communication: All-call capability between stations within the same residence or office environment
- External Device Integration: Option button for controlling external devices via N/O dry contact relay or AC/DC 24V 1.6A maximum output
- Call Tone Management: Dedicated call tone volume control with LED mute indicator for visual feedback on system status
- Receive Volume Control: Independent volume adjustment for incoming calls to accommodate varying acoustic environments
- Optional Extension Speaker: Support for IER-2 call extension speaker to distribute audio throughout larger spaces, or external signaling relay (RY-ES) for 3rd party bell or light integration
- Extended Run Distances: Supports up to 180 feet from power supply to master station (22AWG wire) or 510 feet (18AWG); up to 330 feet from master station to farthest sub-station; cumulative 360 feet (22AWG) or 1,020 feet (18AWG) from power supply to entrance station
Wiring Specifications
The DB-1MD operates on low-capacitance, polyethylene-insulated solid copper conductors. Entrance station to master station connections use 2-conductor wire (Aiphone #871802). Master station to sub-station runs require 4-conductor wire (Aiphone #871804). When sub-stations share power, 4-conductor plus 2-conductor configuration may be necessary (Aiphone #822206 or #871804). All wire must be non-shielded per system design specifications.
Integration & Compatibility
The DB-1MD integrates with the complete Aiphone DB and DA Series product line. Compatible entrance stations include the DA-1DS (1-call audio), DA-2DS (2-call audio), and DA-4DS (4-call audio models). Sub-master stations (DB-1SD) can be networked for multi-zone coverage. System expansion is supported through standard low-voltage wiring infrastructure, making retrofit and new installations straightforward for security integrators and facility managers.
Package Contents & Accessories
The DB-1MD master station ships with core components necessary for basic installation. Common complementary products include the MCW-S/B adjustable desk stand for professional mounting, the IER-2 call extension speaker for audio distribution, and the RY-ES external signaling relay for third-party device control. A PT-1211CA 15V AC plug-in transformer supplies system power. Compatible wire offerings include pre-manufactured shielded 2-conductor (22AWG, 1,000 feet) and standard low-capacitance runs in 18AWG and 22AWG gauges.
Ted PerryPerspective based on aggregated IP Security Depot and affiliated engineering team experience.
I've evaluated the Aiphone DB-1MD in several multi-tenant residential installations and small office environments. This master station delivers reliable hands-free intercom capability with practical device control integration that integrates well into existing low-voltage infrastructure. The VOX operation eliminates the need for user intervention in typical call scenarios, improving throughput and resident satisfaction.
Technical Highlights:
- VOX Communication Mode: Hands-free voice activation reduces user friction compared to push-to-talk-only designs, though simplex mode remains available for environments where acoustic isolation is limited
- Extended Run Support: 510-foot capability at 18AWG wire gauge allows single master station deployments across larger properties without intermediate amplification or repeaters
- Door Release Integration: Direct power-from-entrance-station architecture simplifies wiring—no separate 24V relay supply needed for standard electric strike operation
- Flexible External Control: N/O dry contact relay output accommodates third-party locks, gates, and signaling devices; 24V 1.6A max output covers most residential/light commercial solenoids
Deployment Considerations:
- Confirm entrance station model capability before specification; not all DA Series stations support the same feature set. Verify 2-conductor vs. 4-conductor wiring requirements early in design phase
- For installations exceeding 330 feet from master to sub-station, plan 18AWG wire runs to maintain voltage delivery and audio clarity; 22AWG runs will experience higher insertion loss
- Test VOX sensitivity in the actual acoustic environment before final commissioning; office or retail environments with ambient noise may require push-to-talk fallback or adjustment of tone detection thresholds
The DB-1MD is a solid centerpiece for small-to-mid-scale intercom deployments where hands-free operation and straightforward wiring justify selection. It lacks advanced features like video integration or remote access, but for access control coordination and intra-building communication, it performs reliably with minimal ongoing maintenance. I recommend it to integrators installing in buildings with stable occupancy and modest feature requirements.
