预极化传声器（0V）

40AD 是一款符合 IEC 61094 WS2P 标准、带后置通气孔的 1/2" 预极化压力场传声器。其外极化等效型号是 GRAS 40AP。

GRAS 40AE 是一款 1/2" 预极化自由场传声器，用于测量中等频率下的中等声压级。其等效的 200 V 外极化型号是 GRAS 40AF。

40AM 是一款符合 IEC 61094 WS2F 标准、带后置通气孔的 1/2" 预极化宽频自由场传声器。其外极化等效型号是 GRAS 40AC"">GRAS 40AC。

The 40AO is an IEC 61094 WS2P ½" prepolarized pressure microphone with rear-venting. Read about the externally polarized equivalent [40AG]. It is a high-precision condenser microphone made according to IEC 61094-4 requirements and is ideal for coupler measurements in both laboratory and production environments. It is extremely robust and reliable and can measure sound pressure levels up to 160 dB in the range of 3.15 Hz to 20 kHz. 40AO is individually factory-calibrated and delivered with a calibration chart stating its specific open-circuit sensitivity and pressure frequency response.

The 40AO-FV is an IEC 61094 WS2P ½" prepolarized pressure microphone with front venting. It is a high-precision condenser microphone made according to IEC 61094-4 requirements and is ideal for coupler measurements in both laboratory and production environments. It is extremely robust and reliable and can measure sound pressure levels up to 160 dB in the range of 3.15 Hz to 20 kHz. 40AO-FV is individually factory-calibrated and delivered with a calibration chart stating its specific open-circuit sensitivity and pressure frequency response.

The 40AQ is an IEC 61094 WS2P/D ½" prepolarized random-incidence microphone with rear-venting. It is a high-precision condenser microphone made according to IEC 61094-4 requirements, optimized to measure sound correctly in random, diffuse, and reverberant sound fields. It is extremely robust and reliable and can measure sound pressure levels up to 148 dB in the range of 3.15 Hz to 16 kHz.

40AZ 是一种预极化自由场传声器，具有较大的动态范围和较宽的频率响应。其外部极化等效产品为 GRAS 40AN。

40BD 是一款符合 IEC 61094 WS3P 标准、带后置通气孔的 1/4" 预极化压力场传声器。它是一款根据 IEC 61094-4 标准要求制造的高精度电容传声器。其较低的灵敏度使其成为测量高达 174 dB 高声压级的理想选择。其小巧的尺寸减小了传声器周围的衍射和反射效应，使其频率范围可扩展至 70 kHz。 注意：已针对不带保护栅的使用情况进行优化——测量前请移除保护栅。

The 40BD-FV is an IEC 61094 WS3P ¼″ prepolarized pressure microphone with front venting. It is a high-precision condenser microphone made according to IEC 61094-4 requirements. Its low sensitivity makes it ideal for sound measurements at high sound pressure levels of up to 166 dB. Its small size reduces the effects of diffraction and reflections around the microphone, resulting in a frequency range that extends up to 70 kHz. NOTE: Optimized for use without protection grid—remove grid before measuring.

The 40BE-FV is an IEC 61094 WS3F 1/4” prepolarized free-field microphone with front venting. NOTE: Optimized for use without protection grid—remove grid before measuring.

40DD 是一款符合 IEC 61094 标准、带后置通气孔的 1/8" 预极化压力场传声器。它是一款根据 IEC 61094-4 标准要求制造的高精度电容传声器。其极小的尺寸使其可用于测量极高频率的声音而不会干扰声场。它可测量高达 174 dB 的声压级，频率范围为 6 Hz - 140 kHz。

The 40BE is an IEC 61094 WS3F 1/4” prepolarized free-field microphone with rear-venting. The externally polarized equivalent is 40BF. NOTE: Optimized for use without protection grid—remove grid before measuring.