I am an engineer developing a microphone system for a cockpit voice recorder. One of the tests required is microphone distortion at 1kHz at 120dB SPL. The distance from the loudspeaker source is not specified. I am not sure if your everyday commercial off the shelf loudspeaker would be capable of delivering this level of pressure at the microphone. If I had a typical sensitivity level of 92dB SPL at 1m what sort of level would one expect at 3" from the loudspeaker? At 1m I would need to drive 1000 watts into the speaker. Any suggestions as to the speaker to use? Must be under 5% distortion.
I also need a speaker that is relatively flat in response, 150Hz to 10kHz capable of producing 94dB SPL with about 2% distortion max.
