KAION 4-Trumpet Coaxial Air Horn, 12V / 24V

KAION 4-Trumpet Coaxial Air Horn, 12V / 24V — a four-trumpet air horn with a coaxial speaker design, so all four trumpets sit on a single compact base instead of the long chrome pipes that make conventional air horns awkward to mount. It is intended for trucks, buses, vans, boats and off-road vehicles where the factory horn is not loud enough to be heard over road noise.

Why it is worth fitting

The factory horn on most cars and vans is designed to be adequate in traffic, not to be heard by a lorry driver with the windows up and the radio on. On a commercial vehicle, on a boat or off-road, that gap matters. What usually stops people fitting an air horn is the mounting problem: traditional four-trumpet horns use long individual chrome pipes, which need a large flat area and a lot of space behind the grille. A coaxial design puts all four trumpets on one base, so the footprint is far smaller and the horn fits where the pipes would not. Running on both 12 V and 24 V means the same unit suits a car and a truck, and plastic trumpets do not corrode the way chrome-plated metal does on a vehicle that works in all weathers.

Key features

• Four trumpets on a single coaxial base — much easier to mount than separate chrome pipes
• Works on both 12 V and 24 V, so it suits cars, vans and commercial fleets
• Loud output intended for trucks, buses, boats and off-road vehicles
• Compact footprint fits behind a grille or bumper where pipe-type horns will not
• Plastic housing resists corrosion better than chrome-plated metal trumpets
• Universal mounting — no vehicle-specific bracket is required
• Commonly fitted as a supplementary horn alongside the factory horn
• Simple two-wire connection to an existing horn circuit or a separate switch

Specifications

Will it fit?

Universal. Two things to check before fitting. First, confirm whether the vehicle’s electrical system is 12 V or 24 V. Second, check there is a flat area behind the bumper or grille roughly the footprint of the four trumpets, because although a coaxial base is compact it still needs a solid surface. Ensure the intake of the compressor is not positioned where it will draw in water or road spray, which is the usual cause of an air horn failing after a few months.

Fitting and first use

Disconnect the battery before working on the electrical system. Test-fit the horn in the intended position first, checking that it does not foul the radiator, the headlight, the bumper or the bonnet catch. Mount it on a solid panel rather than a plastic trim piece, because the horn vibrates. Connect the positive lead to the horn circuit — either in parallel with the existing horn or on a separate switch — and earth the negative to a clean bare metal point. Fit an in-line fuse if you are adding a separate circuit. Test the horn with the engine off before refitting any trim, and check the sound is not muffled by whatever is in front of it.

Care and maintenance

Mount the compressor so its air intake faces downwards and away from spray; water drawn into a compressor is what kills air horns. Check the mounting bolts at each service, because vibration works them loose. Keep the trumpets clear of mud and debris, since a blocked trumpet changes the note and reduces volume. If the horn becomes slow to sound, look first at the electrical connections and the earth point rather than the horn itself, as a poor earth is the commonest cause.

Frequently asked questions

How loud is it?

It is designed to be substantially louder than a factory horn and is intended for commercial and off-road use. We do not quote a decibel figure because the supplier’s claim is not independently verified.

Can I keep my original horn as well?

Yes, and it is worth doing. Wiring the air horn in parallel with the factory horn gives you both, and some drivers prefer the original for everyday use.

Will it pass a roadworthiness inspection?

A horn that operates the vehicle’s normal warning function is generally acceptable, but rules differ between countries and some specify a maximum sound level. Check your local requirements before relying on it as the primary horn.

Is it legal to use on the road?

A horn is for warning other road users of danger, and using an unusually loud horn aggressively can attract a penalty in many countries. Fitting it is one thing; how it is used is another.

SKU: AP-031  |  Category: Car Air Horn

Delivery is a flat €12 per order. See our Returns & Exchanges page for delivery times, your 14-day right of withdrawal and the 2-year legal guarantee of conformity.