The Ahuja AM-25DPM portable PA megaphone provides versatile interfacing options for power supplies, external line-level audio feeds, and digital mass storage media. Engineered for industrial, emergency management, and municipal applications, this unit incorporates standardized input sockets and playback decoders to ensure full compatibility across various operating setups.
Power Supply and Electrical Compatibility
The internal Class-D digital amplifier circuit of the AM-25DPM supports three distinct electrical supply configurations, allowing operations teams to alternate between field-swappable dry cells and direct vehicular power:
- Internal AA Dry Cells: The integrated battery compartment accommodates 10 x UM-3 (AA) pencil cells. The system accepts standard 1.5V AA alkaline batteries as well as compatible rechargeable AA chemistries.
- Vehicular / External DC Input: A built-in DC input socket enables continuous operation via standard 12V to 14V DC automotive electrical systems or compatible industrial 12V–14V DC vehicle adapters.
- Li-ion Battery Packs: The electrical input architecture is fully compatible with optional 11.1V Li-ion battery configurations, providing an extended power option for long-duration field public address tasks.
Digital Media and Storage Card Interfacing
For automated public announcements, continuous instructions, and recorded alert playback, the AM-25DPM features integrated digital decoding hardware compatible with solid-state memory devices:
- USB Storage Drives: The integrated standard Type-A USB port supports USB flash memory drives formatted with MP3 audio files for immediate playback through the Class-D amplification stage.
- SD/MMC Memory Cards: A dedicated card slot reads standard Secure Digital (SD) and MultiMediaCards (MMC), decoding MP3 sound tracks directly into the output mix.
- Internal Solid-State Memory: The integrated voice recorder module includes dedicated non-volatile solid-state memory capable of recording and looping voice messages up to 240 seconds (4 minutes) via the microphone interface.
External Audio Source and Signal Compatibility
In addition to solid-state digital media, the megaphone interfaces directly with analog line-level sound sources via its auxiliary connection:
| Interface Type | Physical Connector | Compatible Devices and Signal Levels |
|---|---|---|
| Auxiliary Line Input | 3.5 mm Aux Jack | Mobile phones, portable media players, tablets, and analog line-out equipment carrying MP3 or pre-recorded program material. |
| Handheld Microphone | Coiled stretch cord / Clip | Dedicated Ahuja unidirectional microphone assembly featuring built-in volume adjustment and playback/record control switches. |
| External DC Socket | Standard DC Barrel Socket | Regulated 12V to 14V DC power adapters, vehicle cigarette lighter cables, and portable external 12V industrial battery packs. |
Deployment and Operational Integration
The physical structure of the AM-25DPM is built with an ABS horn flare (Ø230 mm diameter, 382 mm overall length) and operates in two primary operational configurations: direct handheld use via the integrated grip or shoulder-slung operation utilizing the included adjustable carrying strap. When slung on the shoulder, the detached unidirectional microphone with its flexible coiled stretch cord allows operators to deliver announcements, trigger the built-in emergency siren (500 m audible range), or broadcast pre-recorded MP3 warnings without lifting the 1.40 kg main horn assembly.
