Preamplifiers

A condenser microphone must be combined with a preamplifier to provide impedance conversion, some filtering, and the capability to drive relatively long cables without significant signal degradation.

Brüel & Kjær offers a large selection of robust and acoustically optimised preamplifiers that allow operation in a wide range of environmental conditions. The high output current capability of our preamplifiers allows the use of extremely long cables, even with high sound pressure levels present at high frequencies. Preamplifiers are available in both ½" and ¼" dimensions for direct fit with the most used microphone cartridge sizes. For 1" and 1/8", cartridge adaptors are available.

Type number	Diameter	Optimised	Calibration

2660 - 1" microphone preamplifier, very low noise, 20 dB gain, for Type 4179 Designed for very-low-level sound measurements.	1/2 and 1/1 Inch	Low-noise


2669-B - ½" microphone preamplifier, tapered, including cable AO-0428, B&K connector Designed to operate over a wide range of temperature, humidity and other environmental conditions. Connector: lemo 0B 7-pin.	1/2 Inch	Acoustical	Charge Injection Calibration


2669-C - ½" microphone preamplifier, cylindrical, LEMO 1B connector, no cable Designed to operate over a wide range of temperature, humidity and other environmental conditions. Connector: lemo 1B 7 pin.	1/2 Inch	Cylindrical	Charge Injection Calibration


2669-L - ½" microphone preamplifier, tapered, incl. cable, 7-pin LEMO connector This ½" Falcon Range microphone preamplifier operates over a wide range of temperature, humidity and other environmental conditions. Connector: lemo 0B 7 pin &...	1/2 Inch	Acoustical	Charge Injection Calibration


2670 - ¼" microphone preamplifier, integral 2m cable with 7-pin LEMO plug Designed to operate over a wide range of temperature, humidity and other environmental conditions.	1/4 Inch	Phase	Charge Injection Calibration


2670-WB-1419 - ¼" 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.	1/4 Inch	Airbag


2671 - CCLD microphone preamplifier for 1/2" prepolarized microphones, without cable Designed to be used in a wide range of environmental conditions and in narrow spaces.	1/2 Inch	CCLD


2673 - ½" microphone preamplifier with insert voltage facility Designed to allow calibration of ½" and 1" condenser microphones by the insertvoltage technique, either in conjunction with the reciprocity method or with a known...	1/2 Inch		Insert Voltage Calibration


2695 - ½" short CCLD preamplifier Designed for acoustical measurements with a CCLD input module. Prepolarized microphones can be connected to the preamplifier.	1/2 Inch	Short CCLD


2699 - DeltaTron, A-weighted microphone preamplifier Designed to eliminate low-frequency disturbance caused by body boom and road noise which would otherwise be a source of error during in-car measurements using an...	1/2 Inch	A-weighted CCLD