Viking Electronics M2W Paging Power Amplifier for Key Phone Systems
Overview
The Viking Electronics M2W is a compact paging and loud-ringing amplifier purpose-built for key telephone systems in environments where the standard phone ringer simply won't be heard — warehouses, production floors, loading docks, and noisy commercial spaces. The M2W taps directly off a key phone line and delivers 2 watts across 8 ohms, enough to drive the included 25AE paging horn to a measured 110 dB SPL at one meter — that's loud enough to cut through most industrial ambient noise without secondary amplification. The unit ships as a complete starter kit and scales from there.
Key Features
- 2-Watt Output Across 8 Ohms: Delivers enough power to drive the included 25AE horn to 110 dB SPL at 1 meter. For reference, 110 dB is comparable to a chainsaw at close range — adequate for most noisy commercial environments without stacking amplifiers.
- Up to Three 8-Ohm Speakers or Sixteen 45-Ohm Speakers: A single M2W supports multi-speaker zones without requiring an external distribution amplifier. Wire three 8-ohm horns in parallel for wider area coverage, or use up to sixteen 45-ohm speakers for distributed paging across a larger facility.
- Included 25AE 8-Ohm 5-Watt Paging Horn: The 25AE is a 127mm (5-inch) diameter horn with a 24 AWG 69-inch pigtail and 8-ohm / 12-watt nominal rating. It arrives ready to mount — no separate speaker order needed for a single-zone deployment.
- Scalable to 25 Units Per Paging Amplifier: Up to 25 M2W units may be daisy-chained on any single existing paging amplifier output. This means you can grow a paging zone incrementally — add an M2W and a horn as coverage requirements expand, without rearchitecting the core amplifier.
- 120V AC / 13.8 VAC 1.25A UL-Listed Power: The UL-listed adapter draws from standard 120V AC, so no special electrical work is required. The 13.8 VAC output keeps the amplifier circuit within a safe low-voltage envelope while the UL listing satisfies most commercial inspection requirements.
- 6-Position Screw Terminal Block: All field connections terminate on a 6-position screw terminal block. This speeds installation and eliminates proprietary connectors — useful when technicians are wiring during a broader phone system build-out rather than sourcing specialty tooling.
- Compact Footprint — 53mm x 74mm x 25mm: The amplifier module measures just 2.1 inches by 2.9 inches by 1 inch. It fits inside a standard backbox, on a shelf, or mounts adjacent to a key system cabinet without consuming significant rack or wall space.
- Operating Temperature 0°C to 32°C with 5–95% Non-Condensing Humidity: Designed for conditioned or semi-conditioned indoor spaces. This rating covers most office and light-industrial environments, but rules out unheated storage areas or outdoor enclosures in climates with freezing winters — plan accordingly.
- Two-Year Limited Warranty: Viking Electronics backs the M2W with a two-year limited warranty — a straightforward manufacturer commitment on a product category where failures are often traced to installation issues rather than component defects.
Integration and Compatibility
The M2W integrates directly with key telephone systems — it is not a VoIP or SIP device and does not connect to IP-based phone systems or PBX trunks without an analog interface. It is designed to work off the paging output of a key phone system (KSU), receiving the audio signal and amplifying it to drive local speakers. The 6-position screw terminal block accepts standard 24 AWG wiring consistent with typical low-voltage telecom runs. For multi-zone deployments, up to 25 M2W units can be driven from a single paging amplifier output — a practical ceiling for most small to mid-size commercial facilities. The included 25AE horn ships pre-wired with a 69-inch pigtail, making it straightforward to position the speaker up to about 5.75 feet from the amplifier without an extension run. If coverage demands a longer throw or a different dispersion pattern, paging speakers in the 8-ohm or 45-ohm range can be substituted or added within the supported load limits. For broader telephony infrastructure, see the full Viking Electronics product line including door phones, analog adapters, and ring detectors that complement key phone paging systems. If you are planning a complete analog phone and paging infrastructure, review the telephone entry systems category for compatible Viking door and entry devices. When laying out power distribution for a multi-zone paging installation, the power supply category covers UL-listed 120V AC supply options that pair cleanly with analog telecom accessories like the M2W.
What's in the Box
- 1x Viking Electronics M2W paging power amplifier module
- 1x 25AE 8-ohm 5-watt paging horn (127mm diameter, 69-inch 24 AWG pigtail)
- 1x UL-listed 120V AC / 13.8 VAC 1.25A power adapter
Frequently Asked Questions
Q: How many speakers can the M2W drive simultaneously?
A: The M2W supports up to three 8-ohm speakers in parallel or up to sixteen 45-ohm speakers. The included 25AE horn counts as one 8-ohm load, leaving two additional 8-ohm speaker positions available on a standard installation.
Q: Can I use the M2W with a VoIP or SIP phone system?
A: No. The M2W is designed for key telephone systems (KSU-based analog systems) and connects to the paging output of a key phone amplifier. It does not have a SIP stack or IP interface. A VoIP system would require an analog telephone adapter (ATA) or FXS gateway to present an analog paging output before the M2W can be used.
Q: How loud is the included 25AE paging horn?
A: The 25AE horn is rated at 110 dB SPL measured at 1 meter with the M2W driving it at 2 watts across 8 ohms. This is a high output level suitable for noisy warehouse and production floor environments.
Q: What is the warranty on the M2W?
A: Viking Electronics provides a two-year limited warranty on the M2W.
Q: Can multiple M2W units be used together in a larger paging system?
A: Yes. Up to 25 M2W units can be connected to a single paging amplifier output, allowing incremental zone expansion without replacing the core amplifier. Each M2W can independently support its own speaker load up to the rated limits.
Q: What are the operating environment requirements for the M2W?
A: The M2W is rated for operating temperatures of 0°C to 32°C (32°F to 89.6°F) and relative humidity of 5% to 95% non-condensing. It is an indoor device intended for conditioned or semi-conditioned spaces — not suitable for outdoor installation or unheated enclosures in cold climates.
The M2W gets overlooked because it looks simple — and it is, intentionally. What matters here is the 110 dB SPL rating on that included 25AE horn driven at just 2 watts: that's a genuinely high output for a single compact amplifier module, and in a noisy production environment it means one M2W on a key phone paging output actually gets heard across the floor rather than blending into machinery noise.
Technical Highlights:
- Multi-Speaker Load Flexibility: Three 8-ohm or sixteen 45-ohm speakers on one amplifier gives you real zone coverage options. Mix and match based on what your distributor has in stock — as long as you stay inside the impedance load limits, the amplifier handles it.
- 25-Unit Cascade Capacity: The ability to cascade up to 25 M2W units off a single paging amplifier output is the key scalability spec. You don't have to size your core amplifier for your end-state facility — install what you need now and add M2W units as zones grow.
- UL-Listed Power Adapter: The UL listing on the 120V AC / 13.8 VAC 1.25A adapter isn't just a compliance checkbox — it's what gets the install signed off during AHJ inspection on commercial buildouts where the electrical inspector checks low-voltage adapters.
Deployment Considerations:
- This is an analog key-system device only. Confirm you have a KSU-based system with a dedicated paging output before ordering — there's no workaround for a pure VoIP environment without adding ATA hardware upstream.
- The 0°C to 32°C operating range is narrower than many comparable accessories. In unheated distribution centers or loading dock areas that drop below freezing in winter, the M2W needs to be installed in a conditioned closet or enclosure — not surface-mounted on an exposed dock wall.
Best fit for a small-to-mid-size manufacturing or warehouse facility running a legacy key phone system where ring volume is a persistent complaint. The included horn, UL adapter, and screw terminal wiring make it a one-trip installation for a technician already on site for a key system service call.
