The Audio-Technica AT4051B is a modular cardioid condenser microphone from the AT40 Series, engineered for professional recording, broadcast and sound reinforcement. It comprises the AT4900b-48 electronic body and AT4051b-EL cardioid head capsule, both available separately. Direct-coupled balanced output delivers a clean signal even under high-output conditions, while transformerless circuitry virtually eliminates low-frequency distortion. Interchangeable capsules — omnidirectional (AT4049b-EL) and hypercardioid (AT4053b-EL) — extend the system’s versatility.
Polar Pattern
Cardioid
High front-to-back rejection
Frequency Response
20 – 20,000 Hz
Full range
High-Pass Filter
80 Hz
Switchable
Pad
10 dB
Switchable
Features
✓
High front-to-back rejection cardioid pattern for superior source isolation
High front-to-back rejection cardioid pattern for superior source isolation
✓
Direct-coupled balanced output for clean signals under high-output conditions
Direct-coupled balanced output for clean signals under high-output conditions
✓
Transformerless circuitry virtually eliminates low-frequency distortion
Transformerless circuitry virtually eliminates low-frequency distortion
✓
Fast transient response for open, transparent reproduction
Fast transient response for open, transparent reproduction
✓
Modular design — body and capsule available separately
Modular design — body and capsule available separately
✓
Interchangeable capsules: omnidirectional (AT4049b-EL) and hypercardioid (AT4053b-EL)
Interchangeable capsules: omnidirectional (AT4049b-EL) and hypercardioid (AT4053b-EL)
✓
Switchable 80 Hz high-pass filter and 10 dB pad
Switchable 80 Hz high-pass filter and 10 dB pad
✓
Rugged turned-brass housing for long-term dependability
Rugged turned-brass housing for long-term dependability
✓
RoHS-compliant
RoHS-compliant
Specifications
| Element | Externally polarised (DC bias) condenser |
| Polar Pattern | Cardioid |
| Frequency Response | 20 – 20,000 Hz |
| High-Pass Filter | 80 Hz (switchable) |
| Pad | 10 dB (switchable) |
| Output | Direct-coupled, balanced, transformerless |
| Housing | Turned brass |
| Compliance | RoHS |











