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SO.1 Omni Microphone

Regular price $99.99

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The SO.1 is an omnidirectional microphone that has incredibly high sensitivity and low self noise packaged in a small form factor. The SO.1 excels at picking up sounds emitted from objects small to large and from close up to far away. We especially like to use the SO.1 on small objects, very close up to hear every micro nuance. Because the SO.1 is omnidirectional, its pickup response is similar to that of the human ear. The SO.1 utilizes Primo's highly regarded EM272 capsule, a favorite among field recordists, sound designers, location sound, and artists working with sound.

We're excited to be able to provide a frequency response graph and response data table that is specific to the unique microphone capsule used in the SO.1 

The SO.1 capsule enclosure is fabricated in-house and the SO.1 Microphone assembled by hand in NYC.


What's Included

(1) SO.1 Microphone

(1) SO Standard Microphone Cable - XLR or 3.5mm 

(1) SO Standard Microphone Clip

(1) SO Standard Attachable Foam Windscreen

(1) Frequency Response Graph that is specific to the unique microphone capsule that you will receive.

*above quantity amounts will be doubled when ordering a matched stereo pair. 


- Exceptional low self noise

- Wide dynamic range and frequency response for accurate sound reproduction across the audio spectrum

-Balanced, transformerless output for increased immunity to noise over long cable runs

- Small Form Factor

- Utilizes SO Standard Series Accessories

- Frequency Response Data unique to the specific capsule used in the mic that you receive 

- Industry Standard High Quality Components and Parts used. Neutrik Gold Pin Connectors, Mogami Shielded Cable

- Fabricated in house by hand in NYC.

*SO.1 and SO.3 Accessories are interchangeable and cross compatible. Former SO.1 accessories are now part of the SO Standard Series


Capsule | Primo EM272

Polar Pattern | Omnidirectional

Frequency Response | 20hz - 20khz. (Spectrograms show extended range)

Signal to Noise Ratio | 80dB 

Self Noise | 14dBA

Maximum Input SPL | 122dB

Dynamic Range | 108dB

Sensitivity | -28dB (+/- 3.0dB @ 1kHz) Stereo Pairs are matched within 0.3dB @ 1kHz

Operating Voltage | 48v Phantom Power (IEC61938 Standard) with SO XLR Cable option only*. 3.5mm connector option operates on typical Plug In Power

*Included SO XLR cable contains special circuitry to allow microphone to interface with 48v Phantom Power. Third party cables XLR are not supported.

Enclosure | Black PLA Plastic & Nickel Plated Aluminum

Dimensions Unconnected | 1 1/2” Length x  9/16” Diameter

Dimensions Connected |  3” Length x  9/16” Diameter

Polarity | Positive pressure on the diaphragm produces positive voltage on XLR Pin 2. XLR Option only.

Operating Temperature Range | -20°C ~ +60°C

Storage Temperature Range | -40°C ~ +85°C

Cable | Shielded, Mogami, 6 ft length terminated with a three-pin industry standard XLR male connector, Gold Plated.* OR Amphenol Mono/Stereo 3.5mm connector

*SO XLR cable contains special circuitry to allow microphone to interface with 48v Phantom Power. Third party cables XLR are not supported.

SO.1 Microphone Product Manual PDF

Frequency Response

Audio Recordings


*all recordings made with the SO.1 plugged into a Sound Devices Mix Pre-6 II. The recordings contain no post-processing

*any subsequent modifications to the information above will be recorded on the SO.1 Microphone Change Log in the Sonorous Objects Resource Wiki.

Be sure to check out our resource wiki for additional information, contents and downloads. 

Sonorous Objects Resource Wiki