We have one of these on our water well. It works by sending a pulse down the well and times how long it takes to receive the echo. Maybe not loud enough for your purposes, but your description made me think of it.

https://enoscientific.com/ww660/


bp
<part15sbs{at}gmail{dot}com>

On 3/31/2020 3:16 PM, ch...@wbmfg.com wrote:
I need to launch a large sound impulse down a pipe.  Thinking of a starter pistol.  Banging on the side of the pipe is not good enough. 
Need a loud pop that I can do over and over.  Whatever makes the noise need to be small. 
Not sure if there is a small loudspeaker that could produce an impulse sharp and loud enough. 
Do they still make cap pistols?  Not sure if toy caps would be loud enough or not.

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