audio-technica BP28L Line + Gradient Large Diaphragm Condenser Microphone User Manual
- June 6, 2024
- Audio-Technica
Table of Contents
Line + Gradient Large Diaphragm
Condenser Microphone BP28 / BP28L
User Manual
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.
Features
- The large-diaphragm condenser element and optimized circuitry deliver exceptionally low-noise performance – ideal for film/TV production and broadcasting applications
- The overall length of 354.9 mm with a highly directional pickup pattern (BP28)
- The overall length of 567.9 mm with an extremely narrow, highly directional pickup pattern (BP28L)
- The transformer-coupled output provides smooth sonic character
- Extremely high sensitivity (BP28: -28 dB / BP28L: -23 dB), 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
- The patented acoustic port design maintains directionality across the entire frequency range
Notes on use
The BP28 and BP28L require 11V to 52V phantom power for operation, which may
be provided by a mixer or console, or by a separate, in-line source such as
the Audio-Technica AT8801 single-channel or AT8506 four-channel phantom power
supplies.
Avoid leaving the microphone in the open sun or in areas where temperatures
exceed 43°C for extended periods. Extremely high humidity should also be
avoided.
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 a 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.
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.
Specifications
| 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 (on
pad)
BP28L: 138 dB SPL (1 kHz at 1% THD), 148 dB SPL (on pad)
Noise| BP28: 8 dB SPL (A-weighted)
BP28L: 3 dB SPL (A-weighted)
Dynamic range (typical)| 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
Switch| Low cut: on/off , Pad: on/off
Weight| BP28L: 313 g
BP28: 223 g
Dimensions| BP28: 354.9 mm long / BP28L: 567.9 mm long, 28.0 mm maximum body
diameter
Output connector| Integral 3-pin XLRM-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/cm ²= 10 microbars = 94 dB SPL
For product improvement, the product is subject to modification without notice.
Polar pattern
Frequency response
Audio-Technica Corporation
2-46-1 Nishi-Naruse, Machida, Tokyo 194-8666, Japan
©2017 Audio-Technica Corporation
Global Support Contact: www.at-globalsupport.com
27-MAY-2019 Form No.ATGC-L0364-19