Shure WH20 User Manual page 7

Polar Pattern
Cardioid (unidirectional) response—uniform with frequency, symmetrical about
axis (see Figure 7)
Impedance
Microphone rating impedance is 150 ohms (200 ohms actual)
Output Level (close talked* at 1,000 Hz)
Open Circuit Voltage
1
*At 12.5 mm (
Hum Sensitivity
38.4 dB equivalent SPL in a 1 millioersted field
Polarity
WH20QTR as a wired microphone: Positive sound pressure on diaphragm pro-
duces positive voltage on tip with respect to sleeve (ground) of microphone
output phone plug connector.
WH20QTR, WH20TQG used with Shure Wireless Systems:
1
/ -inch Phone Jack Receiver Outputs: Positive sound pressure on diaphragm
4
produces 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 con-
nector, and on tip of Aux output connector.
WH20XLR as a wired microphone: Positive sound pressure on diaphragm pro-
duces positive voltage on pin 2 with respect to pin 3 of microphone output XLR
connector.
6
o
120
o
90
o
60
500 Hz
1000 Hz
4000 Hz
TYPICAL POLAR PATTERNS
. . . . . . . . . . . . . . . . . . . . .
/ inch)
2
o
180
o o
150 150
–20 dB
–15 dB
–10 dB
–5 dB
o o
30 30
0
FIGURE 7
–67.0 db/Pa (0.45 mV)
(1 Pa = 94 dB SPL)
o
120
o
90
o
60