Spec sheet
Line + Gradient Condenser Microphone
broadcast & production microphones
BP4073
Features
• Designed for critical long-distance pickup in broadcasting, lm/ TV
production and theater sound reinforcement applications
• With an overall length of just 23.3 cm (9.17") and weight of just
99 grams (3.5 oz), the BP4073 adds virtually no heft to the end of a
shpole or the top of a minicam
• 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
Description
The BP4073 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, high-
quality 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 BP4073 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
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.
Architect’s and Engineer’s Specications
The microphone shall be an externally polarized (DC bias) condenser. It
shall have a line + gradient polar pattern and a frequency response of 20
Hz to 20,000 Hz. The microphone shall operate from an external 48V DC
phantom power source. It shall be capable of handling sound input levels
up to 141 dB (151 dB with 10 dB pad) with a dynamic range of 128 dB.
Nominal open circuit output voltage shall be 35.5 mV at 1 V, 1 Pascal.
Output shall be low impedance balanced (50 ohms).
The output of the microphone shall be a 3-pin XLRM-type connector.
The microphone shall be equipped with a switchable 10 dB pad and a
switch that permits choice of at response or 80 Hz low-frequency roll-off.
The microphone shall be 233.0 mm (9.17") long and have a diameter of
21.0 mm (0.83"). Weight shall be 99 grams (3.5 oz). The microphone shall
be housed in an aluminum alloy housing. The microphone shall include a
stand clamp, a windscreen, two o-rings and a protective carrying case.
The Audio-Technica BP4073 is specied.