I have a dual trumpet air horn mounted behind my grille. The horn itself has a 1/4" female air inlet. I bought a 150psi 1gallon tank compressor combo. It came with a 1/4" inlet 3/8" outlet solenoid, 1/4" air line and 1/4" fittings. So my air system goes like this: 1 gal. tank at 100-120 psi -> 1/4" air line -> 1/4" inlet -> solenoid -> 3/8" outlet -> 3/8" to 1/4" reducer -> horn. The horns are LOUD, but the tone is pretty high pitched, similar to my trucks stock horn. I played with the horns on my shop compressor at 80 psi and the tone was deeper and more authoritive like a semi truck. I’m thinking te 1/4" line and fittings are what’s causing the high pitch. If I install 3/8" or 1/2" air line from the tank to the solenoid, would the tone be deeper? For instance: tank -> 1/4" to 1/2" fitting -> 1/2" air line -> 1/2" to 1/4" reducer -> solenoid -> 3/8" to 1/4" reducer -> horn
It would probably be louder, I doubt it would be deeper. It’s probably deeper because of the lower pressure on your shop compressor.
Try shutting your compressor off and honking a bunch, does it get deeper at lower pressure?
No, it just gets quieter at lower psi. I think it has to do with the volume of air getting to the horns because it doesnt sound like the low tone horn is blowing…
The horns them self is to blame for the high pitch. That is what they were tuned for. There is no practical way to deepen the tone.
Are you able to increase the size of the air inlet? Even if you are running a larger line to the horn that 1/4" inlet is still going to reduce the air passing through. If you can’t change the female fitting is it possible to drill it out a bit larger? Be aware - I don’t know what type of horn you have and even if I did I can’t say whether that would destroy the horn or not.