Avenson STO-2

Pair of omnidirectional condenser microphones

The STO-2 is a pressure transducer, just like our ears. That's no coincidence: Avenson set out to make microphones with the most natural sound possible, and that is how the STO-2 was born. Sold in matched pairs (like two ears!), STO-2s are perfect for capturing instruments that don't need to be altered or flattered.

A pressure transducer for a natural sound

The STO-2 uses a 0.25" electret pressure capsule with an omnidirectional polar pattern. Its response extends from 20 Hz to 20 kHz (+0/-2 dB). Self-noise stays low at 28 dB (A-weighted), and the microphone handles up to 145 dB SPL with 48 V phantom power. It suits delicate sources and very loud instruments alike.

A true pair for stereo

Each pair is matched to within 0.5 dB in sensitivity, then goes through a final listening test before shipping. Both microphones behave the same way, which ensures a stable stereo image. Avenson recommends techniques such as the Jecklin disc or a spaced pair (AB), where well-matched omnidirectional microphones really come into their own.

Robust construction

STO-2s are made in the USA, with a solid aluminium body. They are built for the studio and the road alike. Their low output impedance (20 Ω) lets you connect them to any microphone preamp with 48 V phantom power, for example with a Mogami XLR microphone cable.

Specifications

• Transducer type: electret condenser, 0.25" pressure transducer
• Polar pattern: omnidirectional
• Sensitivity: 5.25 mV/Pa
• Frequency response: 20 Hz - 20 kHz (+0/-2 dB)
• Equivalent noise: 28 dB (A-weighted)
• Maximum SPL: 145 dB (with 48 V power)
• Output impedance: 20 Ω (load ≥ 1 kΩ)
• Power: 48 V phantom (~6 mA)
• Matching: sensitivity within ± 0.5 dB
• Length: 5" (approx. 12.7 cm)
• Weight: 100 g
• Made in the USA, solid aluminium body

In the box

• 2 STO-2 microphones (matched pair)
• Cedar box
• Rubber microphone clips