舒尔会议话筒　SHURE　MX412S

MX412S: 305 mm (12 in) gooseneck microphone; includes a mute switch and an LED.

SPECIFICATIONS

Frequency Response (Figure 1)
    50 to 17,000 Hz
Polar Pattern (Figure 2)
Output Impedance (at 1000 Hz)
    Rated at 150 Ω (180 Ω actual)
Open Circuit Sensitivity (at 1 kHz, ref. 1 V/Pascal*)
    Cardioid: –35.0 dB (17.8 mV)
    Supercardioid: –33.5 dB (21.1 mV)
    Omnidirectional: –27.5 dB (42.2 mV)
      All settings –12 dB at 0 gain
      *1 Pascal = 94 dB SPL
Maximum SPL (1 kHz at 1% THD, 1 kΩ load)
    Cardioid: 124.2 dB
    Supercardioid: 122.7 dB
    Omnidirectional: 116.7 dB
      All settings +6 dB at 0 gain
Equivalent Output Noise (A-weighted)
    Cardioid: 28.0 dB SPL
    Supercardioid: 26.5 dB SPL
    Omnidirectional: 20.5 dB SPL
Signal to Noise Ratio (referenced at 94 dB SPL)
    Cardioid: 66.0 dB
    Supercardioid: 67.5 dB
    Omnidirectional: 73.5 dB
Dynamic Range at 1 kΩ Load
    96.2 dB
      100 dB at 0 gain
Common Mode Rejection
    45.0 dB minimum
Mute Switch Attenuation (switched models only)
    50.0 dB minimum
Preamplifier Output Clipping Level (1% THD)
    –6.0 dBV (0.5 V)
      –12 dB at 0 gain
Polarity
    Positive sound pressure on diaphragm produces positive
    voltage on pin 2 relative to pin 3 of output connector.
Power Requirements
    11 to 52 Vdc phantom, 2.0 mA
Environmental Requirements
    Operating Temperature Range: –18° C to 57° C (0° F to 135° F)
    Relative Humidity: 0 to 95%
Dimensions (Figure 3)

SHURE(舒尔)是一间专业话筒、无线系统、混音器、 音频处理器及个人监听系统等设备之生产商。她们的产品不只限于专业用途， 其部份产品更适合广大家用者。

舒尔的音响创新历史已历经80余载，蕞初制作优质话筒和音响产品的强烈热情已演变成了一种执着。 勿庸置疑，舒尔将继续在全球范围内为优质话筒和音响产品树立行业标准。

With a history of audio innovation spanning over 80 years, Shure has turned a passion for making great microphones and audio electronics into an obsession. No wonder Shure continues to set the worldwide industry standard for superior microphones and audio electronics.