Improvements on a Low-Cost Experimental
Tetrahedral Ambisonic Microphone
SAMPLE FILE INFORMATION
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Over the next several pages of this site, 8 sets of decoded files are available for download. All were recorded with Experimental 2 in A-format, and are decoded with David McGriffy's VVMic software. They are equalized with a low-frequency slope from 0dB at 400Hz to +6dB at 100Hz and below. No center channel is provided, and the 4 corner channels (set to 35, 123, 237, and 325 degrees, respectively, from center front) are full-range. There is no need to download the LFE channel if you are using a 4.0 system. The LFE channel is also full range. In other words, there is no bass management. All files are 44.1kHz 24-bit.

For most evaluation purposes, and for someone who is experimenting with surround sound with a computer and an interface, decoded files would be an easier introduction to listening to ambisonic recordings. For folks interested in b-format files, 6 sets of b-format files are now available for download. B-format files have no equalization, only a- to b-format conversion.

In most instances, photography was not permitted during concert performances, and the pictures of the venues or setups were taken prior to the actual recording, usually during rehearsal. I was not actually in the concert hall for any of the recordings in Bates. Exp2 was piggy-backed with the Soundfield MKV used for stereo recording. My interface was on the floor at the base of the center microphone stand, and I set the gains from what I heard in the rehearsal, started the recording a few minutes prior to the event, and hoped for the best. This was truly remote recording!
Please respect the educational use of these files and do not repost them on other websites. Please limit any links to the front page of this subsite, http://www.actlab.us/~danh/Ambisonics/ambisonics.html.
Experimental 2 with furry windscreen
Experimental 2