Yes I used an accelerometer. I can't remember the exact brand (I bought it quite a while ago), but I'll check. It was from an instrument manufacturer, that I do remember.
Since it is still setup, I will run a 100% CLD coverage test today as well so there is a 100% vs. 100% graph.
This transducer does not produce much, if any, audible sound. When mounted and fed an audio signal it shakes so you can FEEL the sound, not hear it. Basically a mini bass shaker.
The reason I used the sine sweep is so that the transducer produces a constant, yet wide range of vibrations. The lower frequency range (at the beginning of the graph) obviously produce the higher amplitude vibrations since the transducer wasn't designed nor meant to reproduce/shake at the higher frequencies (the right side of the graph).
The accelerometer is not a mic and does not pick up sound waves. Sure if the sound was loud enough and at the right frequency it could make the accelerometer resonate, but it does not pick up sound. You can literally hold the accelerometer in your hand and yell at it and it wont register anything (except for the small minute movements of you holding it).
^^^ checkmate. also in for results