Line + Gradient Large Diaphragm Condenser Microphone


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The BP28L combines a large-diaphragm condenser element with a 28 mm diameter shotgun body for exceptional low-noise performance.

With an extremely tight pickup pattern and a patented acoustic port design that maintains directionality across the entire frequency range, this 22.4" shotgun microphone is specially tailored to meet the needs of broadcast, film, television, outdoors recording and theater applications. Particularly suitable for long-distance miking for film or theater, the BP28L has an exceptionally low noise floor (3 dB) and transformer-coupled outputs that produce a smooth sonic character. The microphone also provides extremely high sensitivity (-23 dBV), wide dynamic range (135 dB), and high-SPL capability (138 dB), and is equipped with a switchable 80 Hz high-pass filter and 10 dB pad.


  • Designed for use in broadcasting, film/TV production, and theater sound reinforcement applications
  • Overall length of 22.4" with an extremely narrow, highly directional pickup pattern
  • The custom 28 mm diameter shotgun body houses a large-diaphragm condenser element for exceptional low-noise performance
  • Transformer-coupled output provides smooth sonic character
  • Extremely high sensitivity (-23 dBV), wide dynamic range (135 dB), and high-SPL capability (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


Element Fixed-charge back plate, permanently polarized condenser
Polar Pattern Line + gradient
Frequency Response 20-20,000 Hz
Low Frequency Roll Off 80 Hz, 18 dB/octave
Open Circuit Sensitivity -23 dB (70.8 mV) (0 dB=1 V/Pa, 1 kHz)
Impedance 250 ohms
Maximum Input Sound Level 138 dB SPL (1 kHz at 1% THD), 148 dB SPL (When pad is on.)
Noise 3 dB SPL (A-weighted)
Dynamic Range 135 dB (1 kHz at Max SPL)
Signal-to-Noise Ratio 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/off
Weight 313 g (11 oz)
Dimensions 567.9 mm (22.4") long, 28.0 mm (1.1") maximum body diameter
Output Connector Integral 3-pin XLR-M type
Accessories Included AT8169 windscreen, AT8470 stand clamp for 5/8"-27 threaded stands, 5/8"-27 to 3/8"-16 threaded adapter
Audio-Technica Case Style SG7




BP28L Specification Sheet
BP28 User Manual