LOL Its your Horn, you really only need one TBH... more just helps spread the sound in all directions...
I'm pretty sure there are 2 of them, unless you got a bonus. One is higher, and one is lower in tone. Makes the overall horn sound nicer to the ear. You can tell the difference if you disconnect one or the other.
yah they are two different frequencies.....soudns horrible when one isnt working. I used to have an aoooooga horn in one of my tercels......except it was kinda broken so it would do the AOOOOOOOOOGGHGHHHH part and then kind of die before it could go GAAAAAAA it was awesome