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The Stobel Nautilus Twin Tone Air Horn may be easier. One fixing point, single electrical connection, so it's basically plug and play.



Rated at 139dB at 4 feet. Tones at 530hz and 680hz.

Also comes in red.



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John Stimson said:
That's at 4 inches, not feet...They also have ratings at 2m.

The Nautilus is a nifty idea, but the GPS air horns are even louder, at 118dB at 2m compared to 115dB for the Nautilus.
Ah, interesting. Thanks for the info.

I've heard the Nautilus is popular because it's an easy install, plus it's light and reasonably durable. An extra 3dB would be nice (2x the sound pressure and a perceived 20-30% or so increase in volume), though I'm not sure it'll be worth the extra hassle and weight.
 
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