Audio-Technica BP40 Datasheet
12" or more on axis
LEGEND
Frequency in Hertz
Response in dB
10 dB
100
50
200
10k
5k
1k
500
2k
20k
Roll-off
BP40
Large-Diaphragm Dynamic Broadcast Microphone
Features
• Rich, natural condenser-like sound
• Large diameter diaphragm with patented oating-edge
construction for optimal performance
• Humbucking coil prevents electromagnetic interference (EMI)
• Optimized capsule placement for commanding vocal presence
even at a distance
• Hypercardioid polar pattern provides maximum feedback rejection
and isolation of desired sound source
• Switchable 100 Hz high-pass lter
• Multistage windscreen provides superior internal pop ltering
• Rugged, all-metal construction for dependable use in professional
broadcast environments
Description
The BP40 is a large-diaphragm dynamic microphone with a hypercardioid
polar pattern. It is designed for use as a broadcast vocal microphone.
The hypercardioid polar pattern of the microphone is more sensitive to
sound originating directly in front of the element, making it useful for
controlling feedback and reducing pickup of unwanted sounds.
The output of the microphone is a 3-pin XLRM-type connector.
The microphone is equipped with a switch that permits choice of at
response or low-frequency roll-off (via integral 100 Hz high-pass lter).
The microphone is enclosed in a rugged housing with a multistage
windscreen. The capsule is set back from the screen to provide a
more consistent response. The included AT8483 mounting clamp ts
any microphone stand with 5/8"-27 threads. For improved protection
from noise, shock and vibration, the AT8484 shock mount, available
separately, may be used in place of the mounting clamp; it likewise ts
stands with 5/8"-27 threads. A soft protective pouch is also included.
Operation and Maintenance
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 100 Hz high-pass lter provides easy switching from a at
frequency response to a low-end roll-off. The roll-off position reduces
the pickup of low-frequency ambient noise (such as trafc, air-handling
broadcast & production microphones
systems, etc.), room reverberation and mechanically coupled vibrations.
To engage the lter slide the switch toward the “bent” line.
Take care to keep foreign particles from entering the windscreen. An
accumulation of iron or steel lings on the diaphragm, and/or foreign
material in the windscreen’s mesh surface, can degrade performance.
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Specications
Element
Polar pattern
Frequency response
Low frequency roll-off
Open circuit sensitivity
Impedance
Switch
Weight
Dimensions
Dynamic
Hypercardioid
50-16,000 Hz
100 Hz, 6 dB/octave
–48 dB (3.9 mV) re 1V at 1 Pa
450 ohms
Flat, roll-off
632 g (22.3 oz) without AT8483
164.0 mm (6.45") long,
56.0 mm (2.20") diameter
Output connector
Audio-Technica case style
Accessories furnished
Integral 3-pin XLRM-type
R12
AT8483 mounting clamp for 5/8"-27
threaded stands; 5/8"-27 to 3/8"-16
threaded adapter; soft protective pouch
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
Specications are subject to change without notice.
professionals on request.
2
= 10 microbars = 94 dB SPL
frequency response: 50 –16,000 Hz polar pattern
0˚
30˚
330˚
10 dB
200
100
12" or more on axis
Roll-off
500
1k
Frequency in Hertz
5k
2k
50
LEGEND
Audio-Technica Corporation
audio-technica.com ©2015 Audio-Technica P52552
Response in dB
10k
20k
300˚
270˚
240˚
210˚
SCALE IS 5 DECIBELS PER DIVISION
60˚
90˚
120˚
LEGEND
200 Hz
150˚
180˚
1 kHz
5 kHz
8 kHz
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