Ahuja AM 21SD Megaphone

Ahuja AM 21SD Megaphone

The Ahuja AM-21SD is a handheld PA megaphone for making voice announcements to groups and crowds, outdoors and in large indoor spaces, with no installed sound system and no mains power. Ahuja publishes its output as 16 W rated and 20 W maximum — the 20 W figure in the model’s headline is the maximum, not the continuous rating — and that output carries the voice a rated 0.4 km in normal conditions, extending to about 1 km in quiet surroundings.

The design is the classic Ahuja loud-hailer layout: a grey horn with a red rear body, a pistol-grip handle underneath with a trigger talk switch, a shoulder strap for carrying, and a dedicated microphone on a coiled cord. The detachable hand microphone is what makes the AM-21SD practical to use for long stretches — the horn can stay pointed at the crowd, held up or rested, while the microphone stays at your mouth.

Key features

• 16 W rated, 20 W maximum power output, as published by Ahuja
• Voice range of approx. 0.4 km, up to 1 km in quiet areas
• Dedicated unidirectional microphone on a coiled cord
• Built-in siren, switched on for a continuous siren tone
• Runs on 8 x UM-2 dry cells or a 12 V car battery
• Around 15 hours of battery life from a set of cells
• Trigger talk switch and volume control on the grip

Power source and battery life

The AM-21SD runs on 12 V DC, from eight UM-2 dry cells carried in the body or from a vehicle battery — the second option suits mounted and mobile announcement work from cars and jeeps. A set of cells gives around 15 hours of use, so the megaphone works through full event days and multi-day campaigns on replaceable batteries that can be bought anywhere, with no charging infrastructure to plan around. Dry-cell operation also means the unit is ready instantly after months in a store room, which is why this format remains standard issue for institutions.

Microphone, siren and controls

Press the trigger switch on the grip to talk, speak close to the dedicated unidirectional microphone, and set the level with the volume control — keeping it below the point of feedback. The unidirectional pickup favours your voice over surrounding noise. Switching on the siren produces a continuous siren tone for drawing attention before an announcement or alerting a crowd in an emergency, a function that makes the model as useful for drills and evacuation as for routine announcements.

Where it gets used

The horn measures 220 mm across and the unit is 370 mm long, weighing 1.85 kg without cells. That is the size class used across India by police and traffic units, municipal bodies, schools for assemblies and sports days, election and public campaigners, tour guides, construction and industrial sites, and organisers of processions and public events — anywhere a voice has to reach a crowd, clearly, right now.

If the job is announcements to people spread over open ground, the AM-21SD is the established tool for it: rated power honestly stated, a detachable microphone, a siren, and batteries you can replace in the field.