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SPECIFICATIONS
Type
Dynamic
Frequency Response
50 to 15,000 Hz (see Figure 1)
TYPICAL FREQUENCY RESPONSE
FIGURE 1
Polar Pattern
Cardioid (unidirectional)-uniform with frequency,
symmetrical about axis (see Figure 2)
TYPICAL POLAR PATTERNS
Impedance
Dual. Microphone rating impedance is 150 ohms (275
ohms actual) for connection to microphone inputs
rated at 19 to 300 ohms and "High" for connection to
high-impedance microphone inputs.
Wired for low impedance as supplied. To change im-
pedance, see sections on Impedance Selection and
Connections.
Output Level (at 1,000 Hz)
Open Circuit Voltage* . . . . . . . . -78.0dB
Power Level** . . . . . . . . . . . . . . -58.5dB
*0 dB = 1 volt per microbar
**0 dB = 1 milliwatt with 10 microbars
Phasing
Positive pressure on diaphragm produces positive
voltage on pin 2 in low impedance and on pin 1 in
high impedance (with respect to pin 3). See Figure 5.
Switch
545SD: Built-in magnetic reed On-Off switch with
lockplate. To lock switch in On position, remove screw
FIGURE 2
"L"
(0.13 mV)
(1.76 mV)
on lockplate and turn lockplate 180°. Reassemble and
tighten screw.
Cartridge Shock Mount
Internal rubber vibration-isolator
Cable
545SD-CN: 6.1 m (20 ft) two-conductor shielded,
detachable, with professional three-pin audio
connectors* on microphone and equipment ends
*Designed to mate with Cannon XL series, Switchcraft
A3 (Q.G.) series, or equivalent connector.
Swivel Adapter
Positive action, adjustable through 90° from vertical to
horizontal, permits easy removal for handheld use,
suitable for mounting on stand with
Case
Chrome-plated die casting with ARMO-DUR
and stainless steel screen
Dimensions
See Figure 3
Net Weight (less cable)
255 grams (9 oz)
Packaged Weight
545SD-CN: 1042 grams (2 lb, 4
545D-LC and 545SD-LC: 556 grams (1 lb 3
Certifications
Conforms to European Union directives, eligible to
bear CE marking; meets European Union EMC Immu-
nity Requirements (EN 50 082-1, 1992); RF radiated
(IEC 801-3); ESD (IEC 801-2); EFT (IEC 801-4).
"H"
The microphones are shipped connected for low-
-55.0 dB
impedance operation. To change to high impedance (see
Figures 4 and 5), proceed as follows:
1.
Remove plug element at receptacle end of microphone
by turning slotted setscrew in (counterclockwise) and
carefully withdrawing plug element from case.
2.
Disconnect 2-terminal impedance selection socket
from rear of plug element.
3.
Reconnect 2-terminal impedance selection socket in
reverse position so that pin 3 of plug element is inserted
in socket terminal "H".
4. Reassemble plug element into microphone and seal
setscrew securely by turning out (clockwise).
OVERALL DIMENSIONS
FIGURE 3
3
/
4
IMPEDANCE SELECTION
5
/
"-27 thread
8
®
grille
oz)
3
/
oz)
4
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