The order is based on the number of spherical harmonics used to reproduce the sound field. The higher the order, the more spherical harmonics and better the spatial resolution of the sound field. Spatial Mic is capable of 2nd Order ambisonics and uses eight capsules to capture the sound field as opposed to four capsules used on 1st order ambisonic microphones.
Learn more about ambisonics and how it is used in the Voyage Audio Journal article Ambisonics Demystified.
Yes, you can record Spatial Mic with both iOS and Android devices. When recording with an iPhone you may need the Lightning to USB 3 Camera Adapter + battery. You will also need a recording app capable of recording 8 tracks of audio such as Auria, Audio Evolution Mobile, or multiTrack DAW.
Android devices with a USB-C jack can connect directly to Spatial Mic with a single USB-C to C cable. You will also need a recording app capable of recording 8 tracks of audio such as Audio Evolution Mobile, USB Audio Pro Recorder, or N-Track.
The built-in audio drivers for Mac OSX, iOS, and Android work great and support multi-channel audio from Spatial Mic. We do not provide a custom driver for Windows and we recommend using the free driver from Asio4all.
Spatial Mic and the Spatial Mic Converter (AAX) plugin work with Pro Tools Ultimate. Pro Tools Ultimate is required to enable the ambisonic tracks for the plugin.
Spatial Mic must be selected as the master clock source when recording with the ADAT lightpipe outputs. The maximum sample rate and bit depth when using ADAT is 48 kHz / 24 bit.
Spatial Mic includes a 10ft USB cable but the maximum recommended USB cable length is 15ft. There are many active USB repeaters which can increase this distance to 50ft or greater.
Lightpipe cables can very greatly in quality but we have successfully tested up to 50ft.
Figure 8: Traditional Omni → Cardioid → Figure 8 microphone patterns
Basic: Virtual mic patterns capable of second order cardioid (pattern = 2)
Max rE: Maximizes energy concentration vector (rE) by focusing energy signals in the direction of interest
In-Phase: Full side-lobe suppression with no out-of-phase components
Max rE and In-Phase terminology is from ambisonic literature on physical decoding. We decided to keep it consistent with what’s been out there for decades. More information about the plugin can be found in this journal article.