AT4050ST – The high-precision professional stereo microphone
Developed to meet the demanding requirements of professional sound engineers, the AT4050ST is a high-precision stereo condenser microphone designed for professional recording, broadcast and sound reinforcement applications. Thanks to its advanced design and its two independent capsules (cardioid and figure-of-eight), it captures natural and perfectly defined stereo images.
The microphone is originally configured in M/S (Mid-Side) mode, a recording technique highly valued for its accuracy and flexibility during mixing. An integrated switch also allows activation of an internal matrixing system to deliver a direct left-right stereo output with two selectable stereo image widths: 90° (narrow stereo) or 127° (wide stereo).
Like the famous AT4050, the AT4050ST features dual-diaphragm capsules that ensure extremely precise polar pattern definition across the entire frequency range. This design guarantees a stable, detailed stereo image faithful to the original sound source.
Its transformerless circuitry eliminates low-frequency distortion while improving transient response, enabling accurate reproduction of fast and dynamic sources such as orchestral ensembles, percussion, piano or natural ambience recordings.
The AT4050ST also includes an 80 Hz high-pass filter and a –10 dB pad, making it easier to capture high-level sound sources. It is supplied with the AT8449a shock mount, ensuring excellent mechanical isolation from vibrations and handling noise.
Technical specifications:
- Type: Stereo condenser microphone
- Polar patterns: Cardioid, figure-of-eight and M/S
- Capsules: Two independent dual-diaphragm capsules
- Stereo modes: M/S, left-right stereo 90° or 127° via internal matrix
- Sound signature: Precise stereo image with natural and detailed reproduction
- Circuitry: Transformerless design for minimal distortion and excellent transient response
- Controls:
• Stereo mode selector (M/S, 90°, 127°)
• 80 Hz high-pass filter (12 dB/octave)
• Switchable 10 dB pad
- Frequency response: 20 – 18000 Hz
- Sensitivity:
• Stereo 90°: −42 dB (7.9 mV), 1V/Pa
• Stereo 127°: −41 dB (8.9 mV), 1V/Pa
• Mid capsule: −36 dB (15.8 mV), 1V/Pa
• Side capsule: −36 dB (15.8 mV), 1V/Pa
- Maximum SPL:
• Mid capsule: 149 dB SPL (1 kHz, 1% THD)
• Side capsule: 159 dB SPL with −10 dB pad
- Self-noise:
• Stereo 90°: 25 dB SPL
• Stereo 127°: 16 dB SPL
• Mid capsule: 15 dB SPL
• Side capsule: 17 dB SPL
- Dynamic range:
• Mid: 134 dB
• Side: 132 dB
- Signal-to-noise ratio:
• Stereo 90°: 69 dB
• Stereo 127°: 78 dB
• Mid: 79 dB
• Side: 77 dB
- Phantom power: 48V DC, 6.4 mA (total for both channels)
- Dimensions: 193 mm (L) ; Ø 53.4 mm
- Weight: 517 g
- Connector: Integrated 5-pin XLR output
- Included cable: 5 m stereo cable with 5-pin XLRF to dual 3-pin XLRM connectors
- Included accessories:
• AT8449a shock mount
• 5/8"-27 to 3/8"-16 thread adapter
• Dust cover
• Protective carrying case
Key Points:
- Professional stereo microphone based on the technology of the legendary AT4050.
- M/S configuration allowing precise control of the stereo image.
- Internal stereo matrix providing left-right output at 90° or 127°.
- Dual-diaphragm capsules ensuring accurate polar pattern definition across the entire frequency spectrum.
- Transformerless circuitry delivering fast transient response and low distortion.
- Ideal for orchestras, acoustic ensembles, piano, ambience and broadcast.
- Handles very high SPL while maintaining a detailed stereo image.
- Supplied with the AT8449a shock mount for optimal isolation.
