舒尔会议话筒　SHURE　MX412D

MODEL VARIATIONS
MX412D: 304.8 mm (12 in.) desktop mini-condenser, gooseneck-mounted microphone.

SPECIFICATIONS

Frequency Response (Figure 1)
    50 to 17,000 Hz
Polar Pattern (Figure 2)
Output Impedance (at 1,000 Hz)
    Rated at 150 Ω (180 Ω actual)
Open Circuit Sensitivity
    At 1 kHz, ref. 1 V per Pascal*
    Cardioid: –33.5 dBV (21.1 mV)
    Supercardioid: –32.5 dBV (23.7 mV)
    Omnidirectional: –28.0 dBV (39.8 mV)
          * 1 Pascal=94 dB SPL
Maximum SPL (1kHz at 1% THD, 1 kΩ load)
    Cardioid: 123.0 dB
    Supercardioid: 122.0 dB
    Omnidirectional: 117.5 dB
Equivalent Output Noise (A-weighted)
    Cardioid: 29.0 dB SPL
    Supercardioid: 28.0 dB SPL
    Omnidirectional: 70.5 dB SPL
Signal to Noise Ratio (referenced at 94 dB SPL)
    Cardioid: 65.0 dB
    Supercardioid: 66.0 dB
    Omnidirectional: 70.5 dB
Dynamic Range with 1 kΩ load
    94.0 dB
Common Mode Rejection
    45.0 dB minimum
Mute Switch Attenuation
    50.0 dB minimum
Preamplifier Output Clipping Level (1% THD)
    –6.0 dBV (0.5 V)
Polarity
    Positive sound pressure on diaphram produces positive voltage
    on pin 2 relative to pin 3 of XLR output connector.
Power Requirements
    11 to 52 Vdc phantom, 2.0 mA
Environmental Requirements
    Operating Temperature Range: –18° to 57° C (0° to 135° F)
    Relative Humidity: 0 to 95%
Dimensions (Figure 3)
Weight
    MX412D: 0.81 kg (1.80 lbs.) net, 1.63 kg (3.62 lbs.) packaged
Cable Type (figure 7)
    The attached custom cable contains a shielded audio pair and
    three unshielded conductors for logic control.
    Overall diameter=0.6 mm (0.165 in.)
Certification
    Eligible to bear CE Marking. Conforms to European EMC
    Directive 89/336/EEC. Meets applicable tests and performance
    criteria in European Standard EN55103 (1996) parts 1 and 2, for
    residential (E1) and light industrial (E2) environments.