Join Date: Mar 2002
Location: Austin, TX, USA
Re: Why is there a high and low tone horn and does it have a date code
Don't know the official answer but here is a technical one. When you combine two frequencies you get those two frequencies out in addition to the sum and the difference of the two. For example, say you combine a 300 and 700 Hz tone. What you'll hear is 300, 700, 400, and 1000 Hz. So my guess is because you generate 4 times the audible range with 2 frequencies.
68 Coupe, 350 w/ Edelbrock Performer RPM heads, cam, intake, 700R4, Dave's small body HEI