

Audio-Technica AT4051b
Detachable-Capsule Pencil Condenser Microphone
The AT4051b is a revision of the company’s 4051a. Both are transformerless “pencil” microphones that accept interchangeable capsules. The 4051 is nominally a Cardioid microphone, but with appropriate capsules would support other patterns.
The preamp body, part number AT4900b-48, is common to these microphones:
- AT4900b-48 body + AT4051b-EL cardioid capsule = AT4051b
- AT4900b-48 body + AT4049b-EL omni capsule = AT4049b
- AT4900b-48 body + AT4053b-EL hyper capsule = AT4053b
What is the difference between the AT4051b and AT4051a?
The vents on the cardioid capsule changed; see comparison image at right.
- The AT4051b has a flatter HF response (due, in part, to the capsule venting change); gone is the +6dB presence peak at 7kHz (on the AT4051a).
- Self-noise has been cut from 19dBA to 16dBA on the AT4051b.
- The AT4051b includes a -10dB pad, raising the max SPL from 146dB to 155dB.
- The AT4051b is RoHS certified (free of hazardous substances).
- The AT4051b has better EMI/RFI shielding.
- Impedance has dropped from 100Ω to 50Ω.
- The ‘b’ revision is 7g heavier.
The ‘b’ series mics — the AT4051b, AT4053b, AT4049b — include two recessed switches on the mic body; one controls the pad, and the other controls the high-pass filter.
The mic ships with a clip (A-T p/n AT8405a), a foam windscreen, and a carrying case (p/n S1).
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The mic was released in 2008.
Specifications
Compatible Capsules | ||||||
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Pads & Filters | Impedance | SPL/Noise |
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50 Ohms (Low) | Max SPL: 155 dB Self-noise: 16.0 dB(A) |
Weight | Length | Max Diameter | Interface(s) |
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126g (4.44oz) | 155mm (6.10'') | 21mm (0.83'') |
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Power Specifications |
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