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My new triple trumpet air horns are now installed and are much louder and richer sounding than my previous cheapo Streetwise twin air horns (pic below) : -
^ These are the twin horns I have just had replaced ^
They are tucked away out of reach of debris from the road. That third middle note in the chord makes all the difference to the sound - Slightly 'diesel locomotive' but obviously not quite as loud! I'd describe the sound as Italian Diesel Locomotive.
When I'm next at BIALI Skunkwerks I'll ask my mate Dan to make a vid clip I can post.