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CardioidSontronics STC-2

Cardioid Condenser Microphone

The STC-2 is a large-diaphragm cardioid condenser microphone from British company Sontronics. It was part of the company’s initial product line when it launched in 2005.

The STC-2 features two switches, one for a -10 dB pad, and the other for a high-pass filter at 75 Hz.

The mic’s capsule is a large-diaphragm model, presumably a 32mm K67-style capsule with a one-inch diaphragm.

A schematic posted to GroupDIY (see sidebar link) reveals that the mic has no DC oscillator; the capsule is reportedly polarized at about 36VDC, which is low for a large-diaphragm condenser. This helps to explain the mic’s high noise floor of 18dBA.

The mic’s frequency response graph shows a prominent HF boost (+6dB) at 8 kHz, and a rolloff of the higher frequencies.

The STC-2 ships in a padded aluminum flightcase, and includes a traditional “spider” shockmount with extra elastic bands. It is available in either silver or black finish.

The Sontronics STC-2 is also known as: STC2, STC 2.

The mic was released in 2005.


Frequency Response - CardioidClick Graph to Compare!
STC-2 Cardioid Frequency Response Chart
Pickup Patterns Pads & Filters
Cardioid (20 mV/Pa; 20 Hz - 20,000 Hz)
  • Pad: -10 dB (Via Switch)
  • Filter: HPF @ 75 Hz (Via Switch)
Capsule Dimensions Impedance SPL/Noise
Diaphragm diameter: 25mm
200 Ohms (Low) Max SPL: 125 dB
Self-noise: 18.0 dB(A)
Weight Length Max Diameter Interface(s)
n/a n/a n/a
  • 3-pin XLR male (1)
Power Specifications
  • Requires phantom power
  • Phantom voltage: 48v

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