Shure WH20 Manual

GENERAL

The Shure Model WH20 is a rugged, light-weight, 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 WH20 is suitable for any voice communications application where comfort and reliability are required.
The WH20 has a cardioid (unidirectional) pickup pattern. This provides greater gain-before-feedback and isolation from ambient noise and other unwanted sound sources, such as air-conditioning, musical instruments and loudspeakers. A carefully shaped frequency response includes a voice-frequency presence peak and a low-frequency rolloff to compensate for the proximity effect inherent in cardioid microphones during close-talk operation.
An integrated elastic headband secures the headset comfortably. The headband, wireframe, and gooseneck are adjustable to accommodate any head size or shape. The WH20 is supplied with a foam windscreen and clothing clip.

FEATURES

• Lightweight wireframe and 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

MODEL VARIATIONS

• The WH20QTR has a right-angle 1/4-inch phone plug for use with Shure Headset Wireless Microphone Systems, or any unbalanced microphone input.
• The WH20TQG has a miniature four-pin female connector for direct connection to Shure wireless body pack transmitters.
• The WH20XLR has a three-pin male XLR connector with a convenient detachable belt clip.

PRODUCT PARTS

MICROPHONE PARTS
FIGURE 1

The WH20 consists of the following parts:

1. Microphone Cartridge
2. Microphone Boom
3. Hinged Housing
4. Cable and Cable Retainer
5. Wireframe
6. Elastic Headband

COLLAPSIBLE MICROPHONE BOOM

The WH20 headset features a collapsible boom for shipment and storage. Before wearing the headset, unfold the boom until it snaps and locks into place. Refold for storage or transportation.

WEARING THE PRODUCT

Place the headset wireframe around the head so that the wireframe and elastic band are horizontal across the back of the head and the ends of the wireframe fit over and in front of the ears. Position the elastic headband either above or below the wireframe to provide the greatest comfort and stability. The white "SHURE" should face outward. See Figures 2 and 3.

ADJUSTMENT

• If the headset feels loose or uncomfortable, carefully bend the sides of the wireframe to make it tighter or looser (Figure 4A). The angle of the wireframe earpieces may also need adjustment (Figure 4B).
  
• Adjust the tension of the elastic headband across the back of the head by sliding it up or down the ends of the wireframe (see Figure 5).
  

POSITIONING THE MICROPHONE

For maximum gain before feedback, position the gooseneck so that the microphone grille (silver side) is within 25 mm (1 inch) of the right corner of the mouth. Do NOT position it directly in front of the mouth (see Figure 3).

USING THE CLOTHING CLIP

The supplied spring-loaded clothing clip secures the microphone cable to the user's clothing and keeps it from becoming entangled with the user's movements.

OPERATION

Connect the WH20 to the microphone input of a wireless microphone transmitter or a balanced wired microphone input.
NOTE: The WH20 is a dynamic microphone and has inherently lower output than condenser microphones. The transmitter gain may need to be increased to compensate for the WH20's lower output.

WINDSCREEN

If breath noise or "popping" is audible over the sound system, install the supplied windscreen.

WASHING THE FOAM WINDSCREEN

The foam windscreen protects the WH20's microphone-element from dirt and moisture.
When necessary, it can be removed and cleaned in a mild soapy water solution.

Never clean the windscreen with any liquid solution without first removing the windscreen from the microphone boom.

1. Gently pull the windscreen away from microphone.
2. Immerse the windscreen in mild soapy water and gently squeeze it several times.
3. Rinse the windscreen in clean water and dry it with a clean cloth or paper towel. Allow it to air-dry thoroughly.
4. When the windscreen is dry, slide it over the WH20 microphone.

WASHING THE ELASTIC HEADBAND

The elastic headband can be removed from the wireframe and hand-washed in a mild soapy water solution. To remove and wash the headband, follow these steps:

1. Remove the microphone cable retainer from the wireframe.
2. Slide the elastic headband off the wireframe.
3. Wash the headband and allow to dry thoroughly.
4. Slide the headband around the wireframe to its original position. Reattach the cable with the plastic retainer.

Note that the elastic headband supplied with the WH20 is not a standard size; headbands purchased in stores are too long for this application.

SPECIFICATIONS

Type
Dynamic, Close-Talking
Frequency Response (at 8 mm) (see Figure 6)
50 to 15,000 Hz

Polar Pattern (See Figure 7)
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 positive 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 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.

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°C (0° to 140°F)
Storage Temperatures: -29° to 74°C (-20° to 165°F)
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 plug
WH20TQG: Female 4 pin mini connector (TA4F)
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)

REPLACEMENT PARTS

WIRING DIAGRAMS

See Figure 8

SHURE Incorporated http://www.shure.com
United States, Canada, Latin America, Caribbean:
5800 W. Touhy Avenue, Niles, IL 60714-4608, U.S.A.
Phone: 847-600-2000 U.S. Fax: 847-600-1212 Int'l Fax: 847-600-6446
Europe, Middle East, Africa:
Shure Europe GmbH, Phone: 49-7131-72140 Fax: 49-7131-721414
Asia, Pacific:
Shure Asia Limited, Phone: 852-2893-4290 Fax: 852-2893-4055

Documents / Resources

References

• Shure: Microfoons, draadloze microfoons, in-ear monitoring, oortelefoons, hoofdtelefoons - Shure Nederland

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