The GRAS 12AN 4-Channel Power Module is a four-channel power module with 7-pin LEMO 1 B connectors for externally polarized measurement microphone sets. The inputs are AC-coupled directly to the outputs for a flat frequency response down to 0.05 Hz.

The GRAS 12AK is a single-channel power module with a 7-pin LEMO 1B connector for power and polarization of an externally polarized microphone set. It features instantaneous and latched overload indication, adjustable gain settings, A-weighting, and Lin and HP filters.

12AN 电源模块通常用于实验室和现场的声学测量。 如果您正在寻找具有成本效益的解决方案或直接耦合（无滤波器）到输出的多通道电源模块，那么 12AN 电源模块是一个合乎逻辑的选择。

The G.R.A.S. Power Module Type 12AN (Fig. 1) is a portable, four-channel power supply for use with microphone preamplifiers and condenser microphones. It provides:

The GRAS 12AK is a single-channel power module with a 7-pin LEMO 1B connector for power and polarization of an externally polarized microphone set. It features instantaneous and latched overload indication, adjustable gain settings, A-weighting, and Lin and HP filters.

The 12AN Power Module is for general use in acoustic measurements both in the laboratory and in the field. If you are looking for a cost-effective solution or a multi-channel power module with a direct coupling (no filters) to the output, the 12AN Power Module is a logical choice.

12AN 电源模块通常用于实验室和现场的声学测量。 如果您正在寻找具有成本效益的解决方案或与输出直接耦合（无滤波器）的多通道电源模块，那么 12AN 电源模块是一个合理的选择。

The 12AN Power Module has four channels for multi-channel measurements and calibration setups requiring more than one channel. You can operate the 12AN Power Module on batteries or an external DC power supply.

GRAS 12AX 是一个恒流电源模块，用于为 4 个 CCP 前置放大器/麦克风组供电。 它针对集成到生产环境进行了优化。 阳极氧化外壳坚固耐用，可提供良好的防尘、防潮保护。 除了电源开关，它没有外部用户控制。 这样就避免了增益设置的意外改变。 由于 12AX 是一个 4 通道单元，它有 8 个 BNC 连接器，4 个用于麦克风输入，4 个用于输出到分析仪。 所有连接器都安装在后面板上。 它在 +28 VDC 合规电压水平下提供 5 mA 的恒定电流。 通过跳线可以为每个通道单独选择增 …

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