Are two horns better than one?

Dual horn cars have a high and low tone. Can't say that it makes them any more noticable but they typically sound better than the single horn.

Both horns in my Barracuda finally crapped out and I went yarding to get new ones. Would up grabbing a matched set from a late model Mustang (late model mopars have a diffferent connector). I believe the two frequencies are 200Hz and 400Hz.