Yes, horns do have a specific tuning frequency. It's the 4 times the length of the horn line is the tuning frequency. A tuning frequency of 35hz would mean the horn length would be about 8 feet long. The cabin of the vehicle can also add to horn length so the actual length of the enclosure will not really be a good way of knowing where it's tuned.I believe horn enclosures do not have a specific tuning.