At the bottom of this post are links to two B-format files (in ambiX format) that highlight the improvement that OctoMic provides over any 1st-order ambisonic microphone, including our TetraMic.

OctoMic is the first 2nd-order ambisonic microphone commercially available at reasonable cost. We introduced it two weeks ago.

TetraMic is the world's most accurate and popular 1st-order ambisonic microphone. We introduced it in early 2007.

The two recordings are a short excerpt of a relaxed women's chorus rehearsal, recorded in-the-round. Both OctoMic and TetraMic were positioned near the center of a circle of 14 women singers. The two microphones were positioned within a foot of each other.

The OctoMic recording was made on a Zoom F8. The TetraMic recording was made on a Zoom F4.

Please listen with an ambisonic decoder that accepts 1st-order (four channels) and 2nd-order (9 channels) B-format sound files. If you need recommendations, please message us.

To get the full effect during playback, the minimum speaker configuration we recommend is a 6-speaker hexagon ring.

What you'll hear is vastly improved location cues, over a much, much larger listener's sweet spot.

Each OctoMic and TetraMic is precisely and individually calibrated. Its unique calibration correction file is applied during A- to B-format encoding, using the supplied encoder plug-in.

(For TetraMic, the B-format file was encoded with VVAudio's Visual Virtual Microphone v3.5. For OctoMic, the B-format file was encoded with VVOctoEncodeH v1.0.0.)

TetraMic file:

OctoMic file:

(You can see two photos of the recording session on Core Sound's Facebook page.)

Len Moskowitz (
Core Sound LLC
Home of OctoMic and TetraMic

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