Shure WH20 - Manual (Page 7)

8
Polar Pattern
Cardioid (unidirectional) response-uniform with frequency, symmetrical about axis
TYPICAL POLAR PATTERNS
FIGURE 7
Impedance
Rated at 150 ohms (200 ohms actual)
Output Level (close talked* at 1,000 Hz)
Open Circuit Voltage: . . . . . . . . . . . . . . . . . . . . . . . . . . -67.0 db/Pa (0.45 m)
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1Pa = 94 dB SPL
*At 12.5 mm (1/2 inch)
Hum Sensitivity
38.4 dB equivalent SPL in a 1 millioersted field
Polarity
WH20QTR as a wired microphone: Positive sound pressure on diaphragm produces pos-
itive voltage on tip with respect to sleeve (ground) of microphone output phone plug
connector.
WH20QTR, WH20TQG used with Shure Wireless Systems:
1/4-inch Phone Jack Receiver Outputs:
Positive sound pressure on diaphragm produc-
es positive voltage on tip of receiver output connector.
3-pin XLR Receiver Outputs:
Positive sound pressure on diaphragm produces positive
voltage on pin 2 with respect to pin 3 of low-impedance output connector, and on tip of
Aux output connector.
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