

Audio-Technica AT4051a
Detachable-Capsule Pencil Condenser Microphone
The AT4051a is a pencil condenser mic that accepts multiple interchangeable capsules, all of which are externally-biased (true) condenser designs.
The preamplifier body is p/n AT4900a-48; it is a phantom-powered, low noise, transformerless output design with integrated pad (-10dB) and high-pass filter (-12dB/octave @ 80Hz) switches.
It ships in a padded plastic case with a mic clip and foam windscreen.
Electronic Musician
Audio-Technica’s small diaphragm elicited a unanimously positive opinion from the participants in the string listening session. The mic was repeatedly described as “smooth…” [I]t conveyed a “human quality” that was rich in depth and clarity without being too defined…
The AT4051a really impressed me when used as a close-mic on acoustic guitar. It seemed to have all the body of the warmer Neumann and Schoeps models, with the added benefit of a perfectly defined high-end sparkle. At a distance, it took on a smoother and more neutral character not unlike the Schoeps, but retained its characteristic warmth and presence.
The mic was revised in 2008; see the AT4051b for details on what changed.
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Specifications
Compatible Capsules | ||||||
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Pads & Filters | Impedance | SPL/Noise |
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100 Ohms (Low) | Max SPL: 146 dB Self-noise: 19.0 dB(A) |
Weight | Length | Max Diameter | Interface(s) |
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120g (4.23oz) | 155mm (6.10'') | 21mm (0.83'') |
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Power Specifications |
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