Viking Electronics PA-2A Multiline Paging Amplifier
The Viking Electronics PA-2A is a 2-watt paging and loud-ringing amplifier designed to add overhead paging and audible ring alerting to any analog multi-line phone environment — without running additional relay cards, separate bell circuits, or complex wiring. If your facility runs 2–6 analog lines and you need staff to hear calls across a warehouse floor, loading dock, or open shop area, the PA-2A handles it with a single unit and one included horn. Search variation: PA-2A (also searched as PA 2A).
Overview
Most small commercial sites — auto shops, light manufacturing floors, retail back rooms — face the same problem: analog phone lines ring at the desk, but nobody on the floor hears them. The PA-2A solves this by monitoring up to six analog lines simultaneously for ring signal or accepting a dry-contact closure from a phone system. When triggered, it drives the included 25AE paging horn at 108 dB SPL at 1 meter — loud enough to cut through most ambient shop or warehouse noise without a separate PA system. The unit runs on standard 120V AC (via an included 13.8V AC / 1.25A adapter) and mounts in a compact 5.25" x 3.5" x 1.75" enclosure that fits on a shelf, wall bracket, or inside a telecom closet. For more Viking Electronics communication and paging solutions, browse the Viking Electronics catalog.
Key Features
- 2 Watts of Amplified Output: 2W drives up to three 8-Ohm speakers or up to sixteen 45-Ohm speakers — enough speaker coverage to span multiple zones in a single-story building without stacking amplifiers. A single PA-2A can replace a bank of individual extension bells.
- 108 dB SPL with Included 25AE Horn: At 1 meter with one 25AE horn, 108 dB is comparable to a fire alarm sounder — audible at significant distances even in noisy environments. If your ambient noise floor is above 80 dB (heavy machining, etc.), you can add horns up to the 3-unit 8-Ohm limit to maintain coverage.
- Monitors Up to 6 Analog Lines: Two RJ25 jacks handle up to six analog lines (three lines per RJ25), so a single PA-2A covers the entire phone system in most small-to-mid facilities. No extra line cards or relay boards required.
- Contact Closure Activation: Beyond ring detection, the PA-2A accepts a dry-contact closure from a phone system — useful when you need the amplifier triggered by a PBX paging relay rather than tip-ring ring signal. This wires via the 10-position screw terminal block, giving you clean integration with legacy and current analog PBX platforms.
- 600-Ohm Output Impedance: The 600-Ohm balanced output matches standard commercial audio distribution wiring — compatible with 70V distribution systems when properly bridged, and directly compatible with most commercial horn and speaker loads without additional matching transformers for short runs.
- 24V DC Talk Battery: The PA-2A supplies 24V DC talk battery, supporting standard analog telephony line requirements without external phantom power or additional line conditioning.
- Compact Footprint, AC-Powered: At 5.25" x 3.5" x 1.75" and powered from 120V AC via the 13.8V AC / 1.25A supply, installation requires only a standard outlet — no rack space, no UPS, no DC power plant. For facilities already planning PoE network infrastructure, note this unit is AC-only.
Integration & Compatibility
The PA-2A is designed for standard analog (POTS) multi-line environments. It integrates with any analog PBX or key system that provides either ring signal on tip-ring pairs or a dry-contact relay output for paging activation. The dual RJ25 connection handles systems using standard 6P6C modular jacks. For phone system integrators working with commercial telephone systems, the contact closure input means you're not limited to passive ring detection — you can trigger the PA-2A from virtually any switching system with a relay output. Speaker wiring connects via the screw terminal block, supporting field termination of 18–22 AWG speaker runs without specialized tools. Operating temperature range is 0°C to 32°C (32°F to 89.6°F) at 5–95% non-condensing humidity — suitable for climate-controlled facilities but not outdoor or unheated environments. For facilities evaluating broader intercom and paging systems, the PA-2A is a point solution rather than a full paging system — it adds audible alerting, not two-way voice paging.
What's in the Box
- 1x Viking PA-2A paging amplifier unit
- 1x Viking 25AE 8-Ohm paging horn
Frequently Asked Questions
Q: How many analog phone lines can the PA-2A monitor simultaneously?
A: The PA-2A monitors up to 6 analog lines via its two RJ25 jacks (three lines per jack). It triggers on ring signal from any of the monitored lines.
Q: Can the PA-2A be triggered by a PBX paging relay instead of ring detection?
A: Yes. The PA-2A accepts a dry-contact closure from a phone system via its 10-position screw terminal block, allowing activation directly from a PBX paging relay output rather than passive ring detection.
Q: How many speakers can the PA-2A drive?
A: The PA-2A drives up to three 8-Ohm speakers or up to sixteen 45-Ohm speakers from its 2-watt output. The included 25AE paging horn is 8-Ohm.
Q: What is the warranty on the PA-2A?
A: Viking Electronics provides a two-year limited warranty on the PA-2A.
Q: Is the PA-2A suitable for outdoor or unheated environments?
A: No. The PA-2A is rated for 0°C to 32°C operating temperature and 5–95% non-condensing humidity, which limits it to climate-controlled indoor spaces. It is not rated for outdoor use or freezing environments.
Q: What power supply does the PA-2A require?
A: The PA-2A runs on 120V AC, converting internally to 13.8V AC at 1.25A. A standard North American outlet is all that's required — no DC power plant or rack-mount power supply needed.
The PA-2A is the unit I reach for when a client has a 2–6 line analog key system and no budget or appetite for a full overhead paging platform. The 108 dB SPL spec at 1 meter with a single 25AE horn is the key number here — that's not marketing copy, that's genuinely loud, and it means one horn covers most small shop or warehouse areas without adding a second amplifier.
Technical Highlights:
- Dual Activation Modes: Ring detection across 6 analog lines plus dry-contact closure input via the screw terminal — this means the same unit works whether you're monitoring raw POTS lines or integrating with a PBX that has a dedicated paging relay. Most competing single-function bells only handle one mode.
- Speaker Load Flexibility: 2W into up to three 8-Ohm or sixteen 45-Ohm speakers gives you real expansion headroom. If one horn isn't enough for your floor, you can add two more 8-Ohm horns without touching the amplifier or wiring.
- 600-Ohm Output Impedance: The 600-Ohm balanced output is the professional standard for commercial audio distribution — it eliminates the hum and level issues you get trying to run unbalanced consumer-grade speaker outputs over long wire runs in electrically noisy commercial environments.
Deployment Considerations:
- The 10-position screw terminal block handles speaker wiring and contact closure in one place — plan your wire routing before mounting the unit, since rework on screw terminals in a cramped telecom closet wastes time.
- The 0°C to 32°C operating range is the hard constraint here. Unheated garages, loading docks without climate control, or server rooms that run hot above 32°C are out of scope for this unit — verify ambient conditions before specifying it.
The PA-2A is the right answer for auto dealerships, veterinary offices, small manufacturing cells, or any site running analog key systems where staff need audible ring coverage across a space larger than a single room — deployed without the overhead of a full paging system installation.
