Quote:
Originally Posted by gblaue
ctrlz, I think we talked offline about the 6x9 response going lower than 40 Hz. If you are measuring the response with an iPhone 6 or 7, your phone's microphone is the limitation in the measurement.
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I was playing test tones using a phone app and using my ears as the "microphones." The app I used is for android and is called ToneGen. I played the tones over Bluetooth.
At the low end, the app has presets for sine waves at 25, 31, 40, and 50 Hz. To my ear, there is substantial drop-off in volume for both sets of 6x9's below 40 Hz.
I'm not saying this a scientific measurement by any means, just what I have available.