Microphone preamplifiers

Microphone Preamplifiers by Brüel & Kjær are robust and acoustically optimized for a wide range of environmental operating conditions. The high‐output current capability of our preamplifiers is able to drive extremely long cables, without signal degradation - even with high sound pressure levels present at high frequencies. Brüel & Kjær CCLD and classical preamplifier designs are 1/2" and 1/4" in dimension; fitting most microphone cartridges.

TYPE 1706

High-temperature CCLD Preamplifier

Microphone preamplifier designed to make acoustical measurements at high temperature - up to 125°C (257°F) - with a constant-current line drive (CCLD) input module.
- Optimised for : CCLD
- Connector at preamplifier : BNC
- Polarization voltage support : No
- Frequency range : <minmax min="20" max="50000" />
- Attenuation : -0.35
TYPE 1711

Short, ½-inch CCLD microphone preamplifier

Enables you to make acoustical measurements in confined spaces.
- Optimised for : Measuring in confined space
- Connector at preamplifier : SMB
- Polarization voltage support :
- Frequency range : 20 to 20000
- Attenuation : 0.2 dB (typical)
TYPE 2669-B

1/2-inch microphone preamplifier, tapered

Preamplifier Type 2669-B is designed to operate over a wide range of temperatures, humidity, and other environmental conditions.
- Optimised for : Acoustical
- Connector at preamplifier : LEMO 0B, 7-pin
- Polarization voltage support : Yes
- Frequency range : 3 to 200000
- Attenuation : < 0.35
TYPE 2669-C

½-inch microphone preamplifier - cylindrical, LEMO 1B connector

Microphone preamplifier designed to operate over a wide range of temperature, humidity and other environmental conditions. This microphone preamplifier is supplied without a cable.
- Optimised for : Cylindrical
- Connector at preamplifier : LEMO 1B, 7-pin
- Polarization voltage support : Yes
- Frequency range : 3 to 200000
- Attenuation : < 0.35
TYPE 2669-L

½-inch microphone preamplifier, tapered, incl. cable, 7-pin LEMO connector

This ½" microphone preamplifier operates over a wide range of temperature, humidity and other environmental conditions.
- Optimised for : Acoustical
- Connector at preamplifier : LEMO 0B, 7-pin
- Polarization voltage support : Yes
- Frequency range : 3 to 200000
- Attenuation : < 0.35
TYPE 2670

1/4‐inch Microphone Preamplifier Type 2670

Microphone Preamplifier Type 2670 is designed to operate over a wide range of temperature, humidity and other environmental conditions. Delivered with an integral 2M cable with 7-pin LEMO plug.
- Optimised for : Phase
- Connector at preamplifier : Fixed (2 m)
- Polarization voltage support : Yes
- Frequency range : 15 to 200000
- Attenuation : <0.4
TYPE 2670-WB-1419

¼-inch microphone preamplifier, integral 2m cable with 7-pin LEMO plug

Designed to operate over a wide range of temperature, humidity and other environmental conditions. Optimised for airbag measurements.
- Optimised for : Airbag
- Connector at preamplifier : Fixed (2 m)
- Polarization voltage support : Yes
- Frequency range : 1 to 100000
- Attenuation : 11
TYPE 2671

CCLD preamplifier for 1/2" microphones

Microphone preamplifier designed for use with 1/2" microphones in a wide range of environmental conditions and in narrow spaces.
- Optimised for : CCLD
- Connector at preamplifier : BNC
- Polarization voltage support :
- Frequency range : 20-50000
- Attenuation : <0.35
TYPE 2673

½-inch microphone preamplifier with insert voltage facility

Designed to allow calibration of ½" and 1" condenser microphones by the insert voltage technique
- Optimised for :
- Connector at preamplifier : LEMO 0B, 7-pin
- Polarization voltage support : Yes
- Frequency range : 3 to 200000
- Attenuation : < 0.05
TYPE 2695

½-inch short CCLD preamplifier

Designed for acoustical measurements with a CCLD input module. Prepolarized microphones can be connected to the preamplifier.
- Optimised for : Short CCLD
- Connector at preamplifier : 10 – 32 UNF
- Polarization voltage support :
- Frequency range : 20 to 50000
- Attenuation : < 0.2
TYPE 2699

CCLD, A-weighted microphone preamplifier

Designed to eliminate low-frequency disturbance caused by body boom and road noise during in-car measurements
- Optimised for : A-weighted CCLD
- Connector at preamplifier : BNC
- Polarization voltage support :
- Frequency range : A-weighted
- Attenuation : < 0.3