Aiphone IER-2 Call Extension Speaker
The Aiphone IER-2 is a wall-mounted call extension speaker designed to expand intercom audio coverage across a facility without running additional communication lines. Built for integration with Aiphone's legacy and current intercom systems—DB, JF, JK, JO, JP, and KB series—the IER-2 delivers audio from a single pair of non-polarized wires, making retrofit installation straightforward in existing buildings where conduit is already in place.
Overview
The IER-2 serves facilities that need distributed audio awareness without dedicated intercom handsets or display units at every location. Think loading docks, warehouse floors, service areas, or back-of-house spaces where staff need to hear incoming calls but don't require a full two-way station. Weighing just 0.33 lbs. and measuring 120mm (H) × 88mm (W) × 29mm (D), it mounts directly to drywall or snaps into a standard single-gang electrical box—no additional frame or enclosure needed.
Key Features
- Single-pair wiring (non-polarized): Runs on a single twisted pair of standard building wire, so you can often repurpose unused telephone lines or old bell-wire runs already installed in walls. No polarity matching required—swap conductors without losing function.
- Surface-mount or gang-box installation: Mounts directly to any wall surface or clips into a standard 1-gang electrical box. In retrofit scenarios, this means no chasing walls or running new conduit just to add call extension coverage.
- 3-position volume control: Adjusts output level to suit room ambient noise—critical in high-ambient environments (shipping areas, factory floors) where a preset level would be either inaudible or annoying. Field-adjustable without tools.
- Plastic housing: Lightweight, non-corrosive enclosure suitable for indoor commercial spaces. Not rated for outdoor weather exposure, so keep it inside or under covered areas.
- Compact footprint: At roughly 5 inches tall and 3.5 inches wide, it blends into wall space without dominating visual real estate—matters in retail or office environments where aesthetics count.
- Compatible with mature Aiphone intercom series: Verified compatibility with DB, JF, JK, JO, JP, and KB series systems. If your facility already runs any of these platforms, the IER-2 drops in without protocol or wiring translation.
Integration & Compatibility
The IER-2 functions as a passive audio extension—it draws no additional power and adds no network overhead. It connects via the same two-wire intercom bus that your main system uses. No separate power supply, no IP configuration, no VMS integration required. This simplicity is both a strength and a limitation: the speaker only receives audio; it cannot initiate calls or function as a full intercom station. It is purely a call-alert and audio-monitoring device.
Because it operates on legacy non-networked Aiphone systems, the IER-2 is immune to cybersecurity concerns that plague IP-based intercoms—no firmware updates, no cloud connectivity, no API vulnerabilities. For facilities with strict air-gap or closed-loop communication requirements, this architecture is an asset.
What's in the Box
The package includes the IER-2 speaker unit, mounting hardware (screws and wall anchors for surface mounting), and a two-wire terminal block for connection to your intercom system. No batteries, no power adapter, no additional accessories.
Frequently Asked Questions
Q: Can I use the IER-2 outdoors or in wet environments?
A: No. The IER-2 is not weather-resistant and is rated for indoor, dry environments only. Moisture ingress will damage the speaker and circuitry. For outdoor call extension coverage, consult with Aiphone for weatherproof speaker options.
Q: Does the IER-2 require a separate power supply?
A: No. The IER-2 draws all power from the intercom system itself via the two-wire pair. No additional 24V supply or PoE injection is needed.
Q: Can I install the IER-2 in a standard electrical outlet box?
A: Yes. The IER-2 is designed to mount in a single-gang box. This is one of its key advantages for retrofit installations—it uses existing electrical infrastructure without new hole-cutting or wall prep.
Q: What's the maximum run length for the two-wire connection from my main intercom?
A: Consult your specific Aiphone system manual for line-loss specifications. Typical non-networked intercom systems tolerate several hundred feet of wire before audio degradation becomes audible, but resistance losses accumulate with distance and wire gauge. A pre-sales engineer can help size wire gauge if you're planning runs longer than 500 feet.
Q: Is the IER-2 compatible with IP-based Aiphone systems?
A: No. The IER-2 is designed exclusively for Aiphone's legacy analog series (DB, JF, JK, JO, JP, KB). Modern IP-based Aiphone systems use Ethernet and do not use this two-wire extension architecture.
Q: How do I control which calls route to the IER-2 speaker?
A: The IER-2 is a passive extension that receives all incoming call audio on the intercom bus. There is no selective routing or filtering at the IER-2 itself—only volume adjustment. If you need call filtering or selective distribution, those features must be configured at the main intercom control unit or through the system's zone/group programming.
The IER-2 is a no-frills audio extension that fills a real gap in facilities running legacy Aiphone analog systems. If you have a facility footprint larger than what a single intercom station can cover, but you don't want to add another full handset station or run dedicated network cable, the IER-2 solves for that constraint with a single pair of wire and a 0.33 lb. wall-mounted speaker. The three-position volume control matters more than it sounds—I've seen installations in loud warehouses where a fixed-level speaker either couldn't be heard over machinery or was painfully loud during quiet hours.
Technical Highlights:
- Non-polarized two-wire connection: No wiring diagram headaches or polarity errors. Swap the leads and it still works. This is a real operational advantage when installers are retrofitting old telephone runs into intercom extensions.
- Surface or gang-box mount: 120mm × 88mm footprint means it fits in a 1-gang box without oversizing or requires only drywall anchors for surface mount. No special enclosure or recessed box prep needed—saves site prep time and keeps retrofit costs down.
- Zero external power draw: The speaker is entirely powered by the intercom system's own two-wire bus. No 24V supply, no PoE—just existing wire. This means you can add call extension coverage in areas where running power would be costly or impractical.
Deployment Considerations:
- The IER-2 is receive-only. It cannot initiate calls or function as a full intercom station. If you need two-way communication at an extension point, you need a full intercom handset, not this speaker.
- Indoor use only. The plastic housing and lack of weatherproofing make it unsuitable for outdoor mounting, loading dock overhangs, or any wet environment. I've seen contractors try to mount these in partially covered areas and regret it after a seasonal rain.
The IER-2 is the right choice for warehouse floor call coverage, back-of-house service areas, or retail back rooms where you need staff to hear incoming announcements or calls without installing a full intercom station. It's also a smart retrofit option in older facilities where you already have spare telephone pairs in the walls—reusing dormant copper instead of running new cable is both cost-effective and minimal-disruption.
