In brief
Acoustic signals are available in various performances for specific applications.
Useful to know
HELLA distinguishes disc horns and tube acoustic signals in its product range. The choice includes mechanical performance and electrical compatibility, not just preferred sound. [1]
Before replacing, check the voltage, connector, and intended location. Do not connect any more powerful signal to an existing circuit without load assessment. When there are two separate sound components, the lack of one can change the overall sound. This is a different symptom from a complete lack of triggering and deserves an accurate description.
Sources
For further detail and to check the information: