They make these neutered siren boxes, basically, for security and etc. Only have 'Airhorn' tone and PA. Combined with a 100w siren speaker and connected to the horn button it would make a heck of a horn.
Ive thought about it, but its a lot of money for the once or twice a year I need to genuinely use the horn.
Ive thought about it, but its a lot of money for the once or twice a year I need to genuinely use the horn.