1. Mistake of the (last two) recording days:
plugging the mic into the headphones port. That explains why Aniron and the other recordings failed!
2. Data sheets:
for this night’s recordings (for orientation and the original titles of the recordings)
3. Final recording setup:
(for files 73, 74)
from the last three sessions, shown together for comparison.
[barring the ones from Sep25, all have been generated by spectrogram ( signal, 2^14, [ ], 2^12, 44100, ‘yaxis’) ]
The ones below are all generated form the left channels of the following recordings:
- 44.1 kHz ?-Bit WAV | small speaker
- 44.1 kHz 32-Bit WAV | big speaker (low volume)
- 44.1 kHz 32-Bit WAV | big speaker (high volume)
What these labels mean:
small speaker : X-mini II Capsule Speaker | Model XAM4 | website | screenshot of specs
big speaker :
Looking closely at just the harmonics of the sine wave: