Shure SM14A Quick Manual page 2

W A R N I N G
Sustained high volume levels in conjunction with
a tightly fitting receiver tip may adversely affect
the user's hearing. Make certain the volume is set
to a comfortable listening level and position the
receiver tip at the entrance of the ear.
5. Loosen the pivot adjustment knob and position the
microphone as close as possible to the corner of the
mouth. For optimum close-talking operation, the
microphone 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 explosive 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 clips over the grooves in the phone
plugs. The clips can now be fastened to the user's
belt or other clothing. Attach the 3-pin audio connec-
tor to the microphone cable and the phone plugs to
the monitoring unit cables.
7. NOTE: A decrease in receiver output may be due to
clogging of the receiver tip. The tip may be cleaned
by removing it from the ear tube and inserting a
toothpick or similar device through the tip hole. If
clogging is apparent in the ear tube, carefully remove
the obstruction from the ear tube tip. CAUTION: Do
not disturb the foam damping material located just
inside the ear tube tip.
SPECIFICATIONS
MICROPHONE
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 fre-
quency, symmetrical about axis (see Figure 3)
Impedance
Microphone rating impedance is 150 ohms (200 ohms
actual) for connection to microphone inputs rated at
19 to 300 ohms
Output Level (close-talked at 1,000 Hz)
Open Circuit Voltage . . . . . . . . -47.0 dB (4.5 mV)
(0 dB = 1 volt per 100 microbars)
Power Level . . . . . . . . . . . . . .
(0 dB = 1 milliwatt per 10 microbars)
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
Professional three-pin audio connector designed to
mate with Cannon XL series, Switchcraft A3 (Q.G.)
series or equivalent connectors.
RECEIVERS
Type
Dynamic
Frequency Response
70 to 12,000 Hz
Impedance
2,000 ohms at 1 kHz (200-ohm cartridges with
matching transformers in phone plugs)
Output Level
105 dB SPL with 1.4V at 1 kHz (1.0 mW into 2 cc
cavity)
Phasing
Positive voltage on phone plug tips produces
positive pressure in ear tubes
Connector
Phone plugs (contain matching 200:2,000 ohm
transformers)
GENERAL
Cable
Non-detachable, 1.5m (5 ft), four-conductor, shielded,
plastic-jacketed; 762 mm (2.5 ft), two-conductor
receiver cable attached to microphone connector.
Non-detachable, 2.9m (9.5 ft), two-conductor cable
attached to second receiver assembly.
Case
Black thermoplastic microphone and pivot housings,
anodized aluminum end caps, stainless steel grille,
ear tubes and boom
Dimensions
See Figure 4
Net Weight
½
103 grams (3 ounces) less cables and connectors
Packaged Weight
890 grams (1 lb, 15 oz)
-
66.0 dB