Binaural microphone diy12/3/2023 ![]() Head was at 45 degrees, ear was on-axis with the speaker. Put Ed on a stand, run a sweep from the test speaker with the head around 12" away. Any response anomalies in the speakers themselves are compensated for. Put a measurement mic up in front of a test speaker (this time, a Bose MusicMonitor - 2" full-range system covering ~70Hz-16kHz), and derived a calibration curve, which was applied to all future measurements. To get myself back up to speed I did this: Reviving this now I have a little more time to work on it between gigs. The alternative would be to use a bigger driver to go below 1kHz or so. I suspect it's possible to account for those in the measurements. ![]() ![]() There is, of course, the spring-mass resonance of the tweeter, and the associated rolloff lower down. The diaphragm would be acting as if it were perfectly rigid throughout the audio band, and therefore the sound produced ought to follow the voicecoil signals very closely. A 0.5" metal dome tweeter would likely be what I'd use. Note that we don't need much SPL to get a reading. If you choose the source carefully, I think it should be possible to get a source that's phase linear through a useful range. Seperating things further gets difficult - you're always going to need a source and a microphone. Then you can use that data to derive the phase and amplitude response of the head + ears + canals. What you can do is take the mic and measure the source directly. You're certainly measuring the phase (and frequency) response of the head + ears + canals + mics + source. ![]() It's an exciting and busy time for me, but audio projects (apart from gigs, which pay the bills) will be on hold I'm afraid. I've just been through a load of paperwork, and will be moving house over the next week or so. ![]()
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