Audio-Technica BP4071 Datasheet
BP4071
Line + Gradient Condenser Microphone
Features
• Designed for critical long-distance pickup in broadcasting, lm/ TV
production and theater sound reinforcement applications
• Innovative acoustic design provides the same directivity as mics
up to 50% longer
• Direct-coupled, balanced output ensures a clean signal even in
high-output conditions
• Transformerless design for improved pickup of transients
• Rugged housing made of lightweight structural-grade aluminum
alloy
• Integral 80 Hz high-pass lter switch and 10 dB pad switch
broadcast & production microphones
the pickup of low-frequency ambient noise (such as trafc, air-handling
systems, etc.), room reverberation and mechanically coupled vibrations.
To engage the high-pass lter, use the end tip of a paperclip or other
small pointed instrument to slide the switch toward the “bent” line.
The microphone is also equipped with a switchable 10 dB pad that
lowers the microphone’s sensitivity, thus providing higher SPL capability
for exible use with a wide range of users and system congurations.
To engage the 10 dB pad, use the end tip of a paperclip or other small
pointed instrument to slide the switch toward the -10 position.
Avoid leaving the microphone in the open sun or in areas where
temperatures exceed 110° F (43° C) for extended periods. Extremely high
humidity should also be avoided.
Note: To use the microphone with a camera-mount microphone holder
whose diameter is too large to secure the microphone, slide the two
supplied o-rings onto the microphone handle, spaced so that one ts
just in front of, and the other ts just behind, the rubber nubs inside the
microphone holder. When the top of the microphone holder is closed and
tightened down, the o-rings should hold the microphone securely in place.
Description
The BP4071 is an externally polarized (DC bias) condenser microphone
with a line + gradient polar pattern. It is designed for use in professional
recording, broadcasting, lm/TV/video production, wildlife recording, highquality sound reinforcement and other demanding applications.
The microphone requires 48V phantom power for operation.
The microphone's highly directional polar pattern provides a narrow
acceptance angle along with crisp, intelligible audio reproduction
desirable for long-distance sound pickup.
The output of the microphone is a 3-pin XLRM-type connector.
The microphone is equipped with a switchable 10 dB pad and a switch
that permits choice of at response or low-frequency roll-off (via integral
80 Hz high-pass lter).
The microphone is enclosed in a rugged aluminum alloy housing. The
included AT8405a stand clamp permits mounting on any microphone
stand with 5/8"-27 threads. A windscreen, two o-rings and a protective
carrying case are also included.
Operation and Maintenance
The BP4071 requires 48V phantom power for operation.
Output is low impedance (Lo-Z) balanced. The signal appears across Pins
2 and 3; Pin 1 is ground (shield). Output phase is “Pin 2 hot”— positive
acoustic pressure produces positive voltage at Pin 2.
To avoid phase cancellation and poor sound, all mic cables must be wired
consistently: Pin 1-to-Pin 1, etc.
An integral 80 Hz high-pass lter provides easy switching from a at
frequency response to a low-end roll-off. The roll-off position reduces
BP4071
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Specications
Element
Polar pattern
Frequency response
Low frequency roll-off
Open circuit sensitivity
Impedance
Maximum input sound level
Noise
Dynamic range (typical)
Signal-to-noise ratio1
Phantom power requirements
Switches
Weight
Dimensions
Output connector
Audio-Technica case style
Accessories furnished
In the interest of standards development, A.T.U.S.
offers full details on its test methods to other industry
1 Pascal = 10 dynes/cm
1
Typical, A-weighted, using Audio Precision System One.
Specications are subject to change without notice.
professionals on request.
2
= 10 microbars = 94 dB SPL
Externally polarized (DC bias) condenser
Line + gradient
20-20,000 Hz
80 Hz, 18 dB/octave
–29 dB (35.5 mV) re 1V at 1 Pa
50 ohms
141 dB SPL, 1 kHz at 1% T.H.D.;
151 dB SPL, with 10 dB pad (nominal)
1
13 dB SPL
128 dB, 1 kHz at Max SPL
81 dB, 1 kHz at 1 Pa
48V DC, 4.8 mA typical
Flat, roll-off ; 10 dB pad (nominal)
136 g (4.8 oz)
395.0 mm (15.55") long,
21.0 mm (0.83") diameter
Integral 3-pin XLRM-type
SG3
AT8405a stand clamp for
5
/8"-27
threaded stands; 5/8"-27 to 3/8"-16 threaded adapter; AT8145 windscreen; two
o-rings; protective carrying case
frequency response: 20–20,000 Hz
10 dB
100
12" or more on axis
Roll-off
330˚
200
Frequency in Hertz
0˚
180˚
500
30˚
150˚
5k
2k
1k
60˚
120˚
10k
90˚
LEGEND
200 Hz
1 kHz
5 kHz
8 kHz
50
LEGEND
polar pattern
300˚
270˚
240˚
210˚
SCALE IS 5 DECIBELS PER DIVISION
Audio-Technica Corporation
audio-technica.com ©2016 Audio-Technica P52075-01
Response in dB
20k
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