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audio-technica Line Gradient Large Diaphragm Condenser Microphone BP28, BP28L Manual

audio-technica Line Gradient Large Diaphragm Condenser Microphone BP28, BP28L Manual Image

audio-technica Line Gradient Large Diaphragm Condenser Microphone

Thank you for purchasing this product. Before using the product, read through the user manual to ensure that you will use the product correctly. Please keep this manual for future reference.


  • Large-diaphragm condenser element and optimized circuitry deliver exceptional low-noise performance – ideal for film/TV production and broadcasting applications
  • Overall length of 354.9 mm with a highly directional pickup pattern (BP28)
  • Overall length of 567.9 mm with an extremely narrow, highly directional pickup pattern (BP28L)
  • Transformer-coupled output provides smooth sonic character
  • Extremely high sensitivity (BP28: -28 dBV / BP28L: -23 dBV), wide dynamic range (135 dB), and high-SPL capability (BP28: 143 dB / BP28L: 138 dB)
  • Flat frequency response for accurate sound reproduction
  • Rugged housing made of lightweight, structural-grade aluminum alloy
  • Switchable 80 Hz high-pass filter and 10 dB pad
  • Patented acoustic port design maintains directionality across the entire frequency range

Safety precaution

Although this product was designed to be used safely, failing to use it correctly may result in an accident. To ensure safety, observe all warnings and cautions while using the product

Cautions for the product

  • Do not subject the product to strong impact to avoid malfunction.
  • Do not disassemble, modify or attempt to repair the product.
  • Do not handle the product with wet hands to avoid electric shock or injury.
  • Do not store the product under direct sunlight, near heating devices or in a hot, humid or dusty place.

Notes on use

  • Do not connect/disconnect the capsule with the preamplifier while the phantom power is being supplied.
  • Do not touch circuit board of capsule and pins of preamplifier with bare hands
  • In case you have to attach the holder to capsule not to preamplifier, attach it as the UP mark of the capsule faces upward. Be aware not to damage slit mesh of the capsule.

Connection procedure

Connect the output terminals of the microphone to a device that has a microphone input (balanced input) compatible with a phantom power supply.
The output connector is an XLRM-type with polarity as shown in the figure below.

This product requires 48 V DC phantom power.

Switch settings

To reduce the pickup of low frequency ambient noise (such as traffic, air-handling systems, etc.), room reverberation and mechanically coupled vibrations, turn ON ( ) the low-cut filter switch located on the side of the product.

If audio input exceeds the maximum input sound level, set the pad switch to -10 dB.


Element Fixed-charge back plate, permanently polarized condenser
Polar pattern Line + gradient
Frequency response BP28: 20-19,000 Hz
BP28L: 20-20,000 Hz
Low cut 80 Hz, 18 dB/octave
Pad -10 dB
Open circuit sensitivity BP28: -28 dB (39.8 mV) (0 dB=1 V/Pa, 1 kHz)
BP28L: -23 dB (70.8 mV) (0 dB=1 V/Pa, 1 kHz)
Impedance 250 ohms
Maximum input sound level BP28: 143 dB SPL (1 kHz at 1% THD), 153 dB SPL (When pad is on.) BP28L: 138 dB SPL (1 kHz at 1% THD), 148 dB SPL (When pad is on.)
Noise BP28: 8 dB SPL (A-weighted)
BP28L: 3 dB SPL (A-weighted)
Dynamic range 135 dB (1 kHz at Max SPL)
Signal-to-noise ratio BP28: 86 dB (1 kHz at 1 Pa, A-weighted)
BP28L: 91 dB (1 kHz at 1 Pa, A-weighted)
Phantom power requirements 11-52 V DC, 3.4 mA
Switches Low cut: on/off, Pad: on/of
Weight BP28: 223 g (7.9 oz)
BP28L: 313 g (11 oz)
Dimensions BP28: 354.9 mm (14.0”) long / BP28L: 567.9 mm (22.4”) long, 28.0 mm (1.1”) maximum body diameter
Output connector I Integral 3-pin XLR-M type
Audio-Technica case style BP28: SG6

BP28L: SG7

Included accessories Windscreen (BP28:AT8170/BP28L:AT8169), holder (AT8470), stand adapter (3/8”-5/8”), carry case

• 1 Pascal = 10 dynes/cm2 = 10 microbars = 94 dB SPL
For product improvement, the product is subject to modification without notice.

Polar pattern



Frequency response


Frequency in Hertz


0°, 50 cm 0°, 50 cm, Low cut


Included accessories


For USA Only 

Warranty (Please be sure to read the notes below.)

End-User LIMITED WARRANTY information for the USA is available at www.audio-technica.com/usawarranties. You may also contact AudioTechnica U.S., Inc. to request a written copy of the Limited Warranty at 1-330-686-2600 or via mail at 1221 Commerce Drive, Stow, OH 44224.

Audio-Technica Corporation

2-46-1 Nishi-naruse, Machida, Tokyo 194-8666, Japan
©2018 Audio-Technica Corporation
Global Support Contact: www.at-globalsupport.com

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