Dynamic Headset Microphones

The Shure Specialty to General Communications Microphone Series WH 20 is a rugged, lightweight, dynamic headset microphone that provides high-quality voice pickup. It fits securely for active microphone users, such as aerobics instructors and musicians, with low visibility for stage appearances.

The WH-20 cardioid (unidirectional) pickup pattern provides greater gain-before-feedback and isolation from ambient noise and other unwanted sound sources. A carefully shaped frequency response includes a voice-frequency presence peak and a low-frequency roll-off to compensate for the proximity effect inherent in cardioid mics during close-talk operation.

→ Lightweight wireframe and elastic headband adjust for a secure, comfortable fit
→ Extra-strong, small-diameter attached microphone cable resists breakage
→ Collapsible microphone boom for easy storage and transportation
→ Smooth, natural frequency response comparable to high-quality dynamic hand-held vocal microphones
→ High input clipping level eliminates overload distortion
→ Reliable at temperature and humidity extremes
→ Supplied foam windscreen and clothing clip

Type	Dynamic, Close-Talking
Frequency Response (at 8 mm)	50 to 15,000 Hz
Polar Pattern	Cardioid (unidirectional) response -- uniform with frequency, symmetrical about axis
Impedance	Microphone rating impedance is 150 ohms (200 ohms actual)
Output Level (close talked (at 12.5 mm (1/2 inch)) at 1,000 Hz)	Open Circuit Voltage: -67.0 db/Pa (0.45 mV); (1 Pa = 94 dB SPL)
Hum Sensitivity	38.4 dB equivalent SPL in a 1 millioersted field
Polarity WH20QTR as a wired microphone	Positive sound pressure on diaphragm produces positive voltage on tip with respect to sleeve (ground) of microphone output phone plug connector
Polarity WH20QTR, WH20TQG used with Shure Wireless Systems	1/4-inch Phone Jack Receiver Outputs= Positive sound pressure on diaphragm 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 connector, and on tip of Aux output connector
Polarity WH20XLR as a wired microphone	Positive sound pressure on diaphragm produces positive voltage on pin 2 with respect to pin 3 of microphone output XLR connector
Environmental Conditions Operating Temperatures	-18 to 60 degrees C (0 to 140 degrees F)
Environmental Conditions Storage Temperatures	-29 to 74 degreesC (-20 to 165 degrees F)
Environmental Conditions Humidity	0 to 95%
Cable	Attached 1.22 m (4 ft), small-diameter, shielded, PVC-jacketed, two-conductor
Cable Connector WH20QTR	Right-angle 1/4-inch phone
Cable Connector WH20TQG	Female 4 pin mini connector (TA4F)
Cable Connector WH20XLR	Three-pin XLR with detachable belt clip
Construction	Black thermoplastic housing; stainless steel grille; black TEFLON®-coated stainless steel wireframe; flexible plastic-clad monel gooseneck; rubber/nylon elastic headband
Net Weight (including connector)	WH20= 63 g (2.2 oz); WH20TQG= 63 g (2.2 oz); WH20XLR= 98 g (3.5 oz)