Harsh Tone

Loose bolts in the sheet metal mounting area

Tighten the bolts in the sheet metal mounting area

Low Pitch Moan

Too high of a current

Adjust horn as necessary

Weak Tone

Too low of a current

Adjust horn as necessary

Weak Strained Tone

Foreign body in the horn.

Shake out or remove the foreign body

Harsh Vibration

Horn contacting with the sheet metal

Bend the bracket in order to give the horn clearance and freedom from the interference