Originally Posted by
destro713
So, I now know what the "volume control" on the Airzound is actually doing physically, and I know that it might be smart to leave it on full volume regardless, and I know that some Airzound horns have manufacturing defects, and I know that there are other options for noisemaking and general safety devices.
But I'm still interested in my original question. Does the volume control (or pinch valve or whatever you want to call it) on the Airzound actually function effectively as a volume control? Does it modulate the volume of the horn significantly?
I have a download Studio Six Digital sound meter App for my phone. It is not a precision unit but OK for relative measurment. With the valve pinch off to the minium where the Airzound produces some tone, I measure out 80 to 84 db from three ft away. On the same note, a normal conversation measure from three feet away was 62 to 67 db.
The volume knob has a motion range close to 180 degree, tweeking it to get minium sound was not too hard to do. However it did take a needle nose plier to do the task as I cannot turn it to easily with my fingers. The knob was at half way close position when I tried the test, between the half close and full open, you can still vary the volume from minium to full blast.