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2

3. Loosen the pivot adjustment knob, position the boom so

that the microphone is near where the side of the mouth

will be, and tighten the pivot adjustment knob.

4.  Place the assembled microphone on the user’s head

and pull the headband arms downward until they rest

against the head just over the ears. Position the receiver

tip at the entrance to the ear. (Make certain cable is free

of receiver ear tube.)

5. Loosen the pivot adjustment knob and position the mi-

crophone as close as possible to the corner of the

mouth. For optimum close-talking operation, the micro-

phone should be less than 25 mm (1 in.) from the corner

of the mouth. Be sure to position the microphone at the

corner (not the center) of the mouth to eliminate explo-

sive breath sounds (“pop”). Tighten the adjustment

knob.

6.. Snap the microphone connector belt clip over the

groove in the 3-pin audio connector and the receiver

connector belt clip over the groove in the phone plug.

The clips can now be fastened to the user’s belt or other

clothing. Attach the 3-pin audio connector to the micro-

phone cable and the phone plug to the monitoring unit

cable.

MICROPHONE SPECIFICATIONS

TYPE

Dynamic, Close-Talking

FREQUENCY RESPONSE: 

At 8 mm (5/16 in.)

50 to 15,000 Hz (see Figure 2)

POLAR PATTERN

Cardioid (unidirectional) response-uniform with frequen-

cy, symmetrical about axis (see Figure 3)

Impedance

Microphone rating impedance is 150 ohms (200 ohms ac-

tual) for connection to microphone inputs rated at 19 to

300 ohms

Sensitivity 

(close-talked at 1,000 Hz)

Open Circuit Voltage

–67.0 dBV/Pa  (.45 mV)

. . . . . . . . . 

(1 Pa = 94 dB SPL)

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 

Hum Sensitivity 

(typical)

38.4 dB equivalent SPL in a 1 millioersted field

Phasing

Positive pressure on diaphragm produces positive voltage

on pin 2 of microphone connector

Connector

Male XLR audio connector (TA3M)

Receiver
Type

Dynamic

Frequency Response

70 to 12,000 Hz

Impedance

2,000 ohms at 1 kHz (200-ohms cartridge with matching

transformer in phone plug)

Output Level

105 dB SPL with 1.4V at 1 kHz (1.0 mW into 2 cc cavity)

Phasing

Positive voltage on phone plug tip produces positive pres-

sure in ear tube

Connector

Phone plug (contains matching 200:2,000 ohm transformer)

GENERAL SPECIFICATIONS

Cable

Non-detachable, 1.5m (5 ft), four conductor, shielded,

plastic-jacketed; additional 762 mm (2.5 ft), two-conduc-

tor receiver cable attached to micorphone connector.

Case

Black thermoplastic microphone and pivot housing, anod-

ized aluminum end caps, stainless steel grille, ear tube

and boom

Dimensions

See Figure 4

Net Weight

84 grams (3 ounces) less cable and connectors

Packaged Weight

978 grams (2 lb, 2 1/2 oz)

CERTIFICATION

Eligible to bear CE Marking. Conforms to European EMC Di-

rective 89/336/EEC. Meets applicable tests and perfor-

mance criteria in European Standard EN55103 (1996) parts

1 and 2, for residential (E1) and light industrial (E2) environ-

ments.

ACCESSORIES AND REPLACEMENT PARTS

The following furnished accessories and replacement

parts may be ordered through your Authorized Shure Pro-

fessional Products Dealer or from Shure Incorporated.
Connector Belt Clip

RK200BC

. . . . . . . . . . . . . . . . . . . . . 

Windscreen 

RK 184WS

. . . . . . . . . . . . . . . . . . . . . . . . . . 

Carrying Case

90DJ2600

. . . . . . . . . . . . . . . . . . . . . . . . 

Microphone Cartridge

R93

. . . . . . . . . . . . . . . . . . . . . . . . 

Receiver Cartridge

90EL2600

. . . . . . . . . . . . . . . . . . . . . 

Headband Assembly

RK352

. . . . . . . . . . . . . . . . . . . . . . 

Receiver Tip

90FS2600

. . . . . . . . . . . . . . . . . . . . . . . . . . 

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