Audio Technica BP4071L

21-inch long condenser shotgun microphone for broadcast

• 539 mm (21.22") long line-plus-gradient condenser shotgun microphone, one of the longest shotguns available today
• Extremely narrow and highly directional polar pattern, with strong side and rear rejection
• Developed at the request of broadcast professionals
• Balanced, direct-coupled output (transformerless) for a clean signal even at high levels
• Self-noise of 13 dB SPL and a dynamic range of 128 dB
• Maximum SPL of 141 dB, 151 dB with 10 dB pad
• Switchable 80 Hz high-pass filter (18 dB/octave) and -10 dB pad
• Lightweight 175 g aluminum alloy body, with mount, windscreen, and carrying case included

The Audio-Technica BP4071L is the long-body version of the BP4071: a 539 mm condenser shotgun microphone, developed at the request of broadcast professionals for situations requiring maximum directivity. The extremely narrow polar pattern and excellent rejection of side and rear sounds isolate the sound source even at great distances, delivering clear and intelligible audio. It is a go-to tool for sports broadcasting, live events, film and television productions, and theater sound reinforcement.

Long-line + gradient shotgun for maximum directivity

The BP4071L combines a gradient capsule with a long interference tube. The length of the tube further narrows the pickup angle compared to standard-sized shotguns, allowing you to capture dialogue, voices, and distant sounds while keeping ambient noise low—even in noisy environments such as stadiums, public squares, or outdoor sets.

When to Choose a Long Shotgun

A long shotgun performs best when the distance from the sound source is great and you cannot get closer: on the sidelines at sporting events, nature filming, large stages, or wide shots on set. In these situations, the BP4071L’s additional directivity makes all the difference in signal intelligibility.

Transformerless output and low self-noise

The balanced, direct-coupled, transformerless output improves transient response and keeps the signal clean and distortion-free even with high-level sources. With self-noise of just 13 dB SPL and a sensitivity of -29 dB, it can capture even the faintest sounds from a distance, while the 128 dB dynamic range and maximum SPL of 141 dB, 151 dB with the pad engaged, easily handle the loudest sources.

Frequency response from 20 Hz to 18 kHz

The frequency response from 20 Hz to 18 kHz delivers a clear and intelligible sound, ideal for speech and ambient sounds in broadcast productions.

80 Hz high-pass filter, 10 dB pad, and aluminum construction

The 80 Hz high-pass filter, with a slope of 18 dB/octave, reduces traffic noise, ventilation noise, room reverberation, and mechanical vibrations transmitted by the boom or stand. The switchable -10 dB pad prevents clipping with very loud sound sources.

Aluminum alloy body and included accessories

The structural aluminum alloy body combines lightness and durability: despite its length, the BP4071L weighs only 175 g. Included in the package are the AT8405a mount for 5/8"-27 threaded stands with a 3/8"-16 adapter, the AT8147 foam windscreen, two O-rings, and a protective carrying case. The microphone complies with the RoHS directive.

Technical Specifications

• Brand: Audio-Technica
• Model: BP4071L
• Type: condenser shotgun microphone
• Element: externally biased condenser (DC bias)
• Polar pattern: line + gradient
• Frequency response: 20 Hz – 18 kHz
• High-pass filter: 80 Hz, 18 dB/octave, switchable (linear / roll-off)
• Pad: 10 dB (nominal), switchable
• Open-circuit sensitivity: -29 dB (35.5 mV) re 1 V at 1 Pa
• Maximum SPL: 141 dB SPL (1 kHz, 1% THD); 151 dB SPL with 10 dB pad
• Self-noise: 13 dB SPL
• Dynamic range: 128 dB (1 kHz, maximum SPL)
• Signal-to-noise ratio: 81 dB (1 kHz, 1 Pa)
• Output: balanced, direct-coupled, transformerless
• Power supply: 48 V DC phantom power, 4.8 mA typical
• Output connector: Integrated 3-pin male XLR
• Body: structural aluminum alloy
• Dimensions: length 539 mm (21.22"), maximum diameter 21 mm
• Weight: 175 g
• Included accessories: AT8405a mount for 5/8"-27 booms, 5/8"-27 to 3/8"-16 adapter, AT8147 windscreen, two O-rings, protective case
• Compliance: RoHS