Audio-Technica BP4025
X/Y Stereo Condenser Stereo Microphone
Part of Audio-Technica’s “Broadcast & Production” series, the BP4025 is an end-address XY-stereo microphone with a unique compact dual-capsule stereo head.
Rather than mounting the capsules so their planes intersect at 90°, as one might expect would be necessary for X-Y imaging, A-T engineers have produced a realistic, wide stereo image using capsules mounted nearly parallel, back-to-back. This approach allows the headbasket assembly to be significantly smaller than if the capsules were mounted at right angles to one another.
(A-T’s “consumer” version of this mic, the AT8022, uses a similar mounting and baffling arrangement for small-diaphragm capsules; see sidebar link.)
The two capsules in the BP4025 are large-diaphragm electrets. Although originally described here as having been “designed for the AT2035 and modified for use [in the BP4025],” our source for this description has updated us that this is not entirely accurate, yet no further explanation on the BP4025’s capsules was provided.
The diaphragm material is 2-micron PPS (Polyphenylene Sulfide), a plastic resin known for its thermal and directional stability. The diaphragms’ active diameter is 24.3mm.
The output circuit is transformer-balanced.
The mic ships with a mic clip (Audio-Technica p/n AT8405a), a foam windscreen, and a soft storage pouch.
In August, 2009, Audio-Technica issued a Service Bulletin offering a free repair for all BP4025 with date codes 0844, 0850, 0851, 0852, 0904, 0907. The mics are wired out of phase, making the difficult to use in conjunction with in-phase microphones. See sidebar link for contact info.
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The mic was released in 2008.
Specifications
Frequency Response - X/Y StereoClick Graph to Compare! |
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Pickup Patterns | Pads & Filters |
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X/Y Stereo
(25.1 mV/Pa; 20 - 17,000 Hz) |
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Capsule Dimensions | Impedance | SPL/Noise |
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Diaphragm diameter: 24.3mm Capsule diameter: 26mm Diaphragm gauge: 2 microns |
170 Ohms (Low) | Max SPL: 155 dB Self-noise: 14.0 dB(A) |
Weight | Length | Max Diameter | Interface(s) |
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269g (9.49oz) | 186mm (7.32'') | 47mm (1.85'') |
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Power Specifications |
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