前置放大器（预放）

The GRAS 1/2" Preamplifier GRAS 26CA is a general purpose preamplifier optimized for use with prepolarized condenser microphones. It is a small,robust unit and uses a GRAS CCP power supply (ICP ®), e.g. GRAS 12AL. It has a very low inherent noise level, and a large dynamic range and a frequency response from below 2 Hz to above 200 kHz.

The GRAS 26CA-HT 1/2" CCP High Temperature Preamp (BNC) is a 1/2" CCP preamplifier for use with prepolarized microphones. It is optimized for high-temperature applications up to 120 °C (248 °F).  It has a low inherent noise level, a large dynamic range and a frequency response from 2 Hz to 200 kHz.

The GRAS 1/4″ preamplifier is a general-purpose preamplifier optimized for use with prepolarized condenser microphones. It is a small, robust unit and uses a GRAS CCP power supply, e.g., GRAS 12AL. It has a very low inherent noise level, a large dynamic range, and a frequency response from below 2 Hz to above 200 kHz.

The GRAS 1/2" Preamplifier GRAS 26CI is a preamplifier optimized for low frequency use together with prepolarized condenser microphones. It is a small, robust unit and uses a GRAS CCP power supply (ICP ®), e.g. GRAS 12AL. It has a very low inherent noise level, and a large dynamic range and a frequency response from below 1 Hz to above 200 kHz.

The GRAS 26CT 1/4" Preamplifier is a very small preamplifier optimized for use with prepolarized condenser microphones. It is a robust unit and uses a CCP power supply. It has a very low inherent noise level, a large dynamic range and a frequency response from below 2 Hz to above 200 kHz.

The GRAS 26CB 1/4" CCP Standard Preamplifier with Microdot Connector is a general-purpose preamplifier optimized for use with prepolarized condenser microphones. It is a small, robust unit and uses a GRAS CCP power supply, e.g., GRAS 12AL. It has a very low inherent noise level, a large dynamic range, and a frequency response from below 2 Hz to above 200 kHz.

The GRAS 26CC 1/4" Preamplifier is a general purpose preamplifier optimized for use with prepolarized condenser microphones. It is a small, robust unit and uses a GRAS CCP power supply, e.g. GRAS 12AL. It has a very low inherent noise level, a large dynamic range and a frequency response from below 2 Hz to above 200 kHz.

The GRAS 1/2-inch Preamplifier GRAS 26CF is a general purpose preamplifier optimized for use with prepolarized condenser microphones. It is a small, robust unit and uses a GRAS CCP power supply, e.g. GRAS 12AL. It has low inherent noise level, a large dynamic range and a frequency response from 2.5 Hz to 100 kHz.

The GRAS 26CG ¼″ CCP Preamplifier is a small robust unit optimised for acoustic measurements using condenser microphones. It has a very low inherent noise level, a wide dynamic range, and a wide frequency response from below 1 Hz to above 200 kHz.

The GRAS 26CK ½” Preamplifier, Very Short is a very small preamplifier optimized for use with prepolarized condenser microphones. It is a robust unit that uses a constant current power (CCP) supply. The 26CK has a very low inherent noise level, a large dynamic range, and a frequency response from below 2 Hz to above 200 kHz.

The GRAS 26CS 1/4" Preamplifier is a very small preamplifier optimized for use with prepolarized condenser microphones. It is a robust unit and uses a CCP power supply. It has a very low inherent noise level, a large dynamic range and a frequency response from below 2 Hz to above 200 kHz.

GRAS 26TC 1/4" 前置放大器是一款专为使用电容式传声器进行声学测量而优化的紧凑型坚固设备。该设备具有极低的本底噪声水平、超宽的动态范围，以及从 2 Hz到 200 kHz的频率响应。

The GRAS 26AC-1 1/4" Preamplifier is a small robust unit optimised for acoustic measurements using condenser microphones. It has a very low inherent noise level, a wide dynamic range and a frequency response from below 2 Hz to above 200 kHz.

26AI 是一款 1/2 英寸传声器前置放大器，配备集成式 7-pin LEMO 公头接口和 40 GΩ 输入阻抗。

The GRAS ¼" Preamplifier Type 26AS is a small robust unit short enough for use in confined spaces, e.g., for binaural measurements with the KEMAR Manikin (GRAS 45BB or GRAS 45BC) or GRAS 45CA Hearing-protector Test Fixture. It has a very low inherent-noise level, a wide dynamic range, and a frequency response from below 2 Hz to above 200 kHz.

The GRAS ¼″ Preamplifier Type 26HG is a small robust unit optimised for acoustic measurements using condenser microphones. It has a very low inherent noise level, a wide dynamic range and a wide frequency response from below 1 Hz toabove 200 kHz.

The GRAS 26AB 1/4" Preamplifier is a small robust unit optimised for acoustic measurementsusing condenser microphones. It has a very low inherent noise level, a wide dynamic range and a frequency response from below 2 Hz to above 200 kHz.

26TK 是一款 1/2 英寸前置放大器，配备集成式 7 针 LEMO 公头连接器。其 CCP 对应型号为 GRAS 26CA。 26TK 型设备配备内置 TEDS 芯片，可作为单一单元进行编程，并可安装传声器。

The GRAS 26AM ½-inch Preamplifier is a small robust unit optimised for acoustic measurements using condenser microphones. It hase a very low inherent noise level, a wide dynamic range and a frequency response from below 2 Hz to above 200 kHz.