Crown Audio Microphone MB 4E User Manual

POLAR  
PATTERN  
MINI-BOUNDARY  
MICROPHONE  
MB-4  
MB-4E  
he Crown® MB-4 is a miniature boundary  
microphone for multi-miking applications  
such as teleconferencing, distance learning,  
Features  
• Half-supercardioid polar pattern reduces  
feedback, room acoustics and background  
noise  
T
Ideal for teleconferencing, distance  
learning, boardrooms and courtrooms  
Has a 15-foot attached cable leading to an  
XLR-type output connector with built-in  
mic electronics  
boardrooms, courtrooms, and TV or theatrical  
applications. Double-sided sticky tape is pro-  
vided for attaching the unit under shelves, on  
walls, etc.  
• Clear, natural sound  
Thanks to its supercardioid pickup pattern, the  
MB-4 greatly reduces ambient noise and pickup  
of room reverberation. The result is a clearer  
sound.  
• Small and inconspicuous  
The MB-4 has a 15-foot attached cable leading  
to an XLR-type output connector with built-in  
mic electronics. It is powered by 12-48V phan-  
tom power, and is low-impedance balanced.  
Specifications  
MB-4 specifications are at the mic cable connec-  
tor. MB-4E specifications are at the interface output  
terminals.  
Net weight: Microphone: 0.7 ounces (19.8 grams).  
Power module: 2.8 ounces (78.6 grams).  
Dimensions: See Fig. 4.  
Included accessories: Double-sided tape for fastening  
under shelves, etc., for theatrical applications.  
Optional accessories (MB-4 only): PH-1A phantom  
power supply (1 channel, battery or DC-adapter  
powered).  
Required accessory (MB-4E only): Crown MB-100 or  
MB-200 Interface.  
The MB-4E is the same, but without the elec-  
tronics/connector.  
Type: Phase Coherent Cardioid.  
Element: Electret condenser.  
Frequency response (typical): 50 Hz to 15,000 Hz at  
30 degrees incidence to surface (see Fig. 1).  
Polar pattern: Half-supercardioid (supercardioid in  
the hemisphere above the primary boundary). See  
Figs. 2 and 3.  
Impedance: 150 ohms, balanced (recommended load  
impedance 1000 ohms or greater).  
Open-circuit sensitivity (typical): 22 mV/Pa* (–33  
dB re 1 volt/Pa).  
Power sensitivity: –30.5 dB re 1 mW/Pa.* EIA rating  
–125 dBm.  
The MB-4E must be used with the Crown MB-  
100 or MB-200 interface (not included). The  
interface provides these functions:  
• Powers and equalizes up to four mics.  
• Provides programmable switching to turn  
the mic on or off if desired (switches not  
provided).  
• The MB-200 interface also has remote  
switch sensing via an optical coupler.  
• Pluggable microphone inputs.  
• Provides balanced outputs from the inter-  
face.  
*1 pascal = 10 dynes/cm2 = 10 microbars = 94 dB SPL.  
Fig. 1  
Frequency Response  
Equivalent noise level (self-noise): 22 dB SPL typical  
(0 dB=0.0002 dyne/cm2), A-weighted.  
+15  
+10  
Features  
S/N ratio: 72 dB at 94 dB SPL.  
Maximum SPL: 120 dB SPL at 3% THD.  
+5  
• Tiny, inconspicuous.  
• Can be used without putting holes in the  
table.  
• Clean, clear, natural sound.  
• Low-Z balanced output prevents hum and  
high-frequency loss.  
• LED indicates mic on (MB-4E only).  
• LED in MB-4E is defeatable.  
• Switches can be internally programmed  
for touch-on/touch-off, momentary on, or  
momentary off.  
• Remote sensing of switch closure (in MB-  
200 interface).  
• Removable grille assembly can be painted.  
0˚  
dB 0  
–5  
Polarity (MB-4): Positive (inward) pressure on the  
diaphragm produces positive voltage on pin 2 with  
respect to pin 3.  
Polarity (MB-4E): Positive (inward) pressure on  
diaphragm produces positive voltage on interface  
output terminal 1 with respect to terminal 3, and on  
terminal 4 with respect to terminal 6.  
Operating voltage (MB-4): Phantom power, 12-48  
volts DC on pins 2 and 3 with respect to pin 1 of  
output connector.  
Operating voltage (MB-4E): 18-48V phantom power  
at interface output.  
Current drain (MB-4): 4 mA nominal.  
Current drain (MB-4E): 4 mA nominal with LED off, 5  
mA nominal with LED on.  
Connector (MB-4): 3-pin pro audio, XLR-type.  
–10  
130˚  
–15  
–20  
–25  
–30  
–35  
10K  
20  
100  
1K  
Frequency in Hz  
How to Paint the Microphone  
1. Using a small screwdriver, pry open one side  
of the grille, then the other side (Fig. 5).  
Fig. 2  
Vertical-Plane Polar Response  
Connector (MB-4E): Pluggable terminal block (one  
block per every two microphones).  
60˚  
90˚  
120˚  
2. Remove foam liner.  
Cable: Permanently attached, black, 15-foot (4.572-  
m), 2-conductor shielded cable from mic to power  
module or interface. No other cable supplied. Use  
two-conductor shielded mic cable from power  
module to mixer, or from MB-100 Interface to  
mixer.  
Materials: High-impact molded plastic and steel mesh  
mic grille, steel power module.  
Finish: Satin black.  
1 kHz  
200 Hz  
5 kHz  
3. Wearing a dust mask, spray-paint the grille  
assembly. Be sure grille holes are not clogged.  
150˚  
30˚  
4. Allow paint to completely dry.  
5. Make sure the LED is properly aligned.  
6. Carefully place the grille assembly over the  
LED, and snap in place.  
FRONT  
REAR  
180˚  
0˚  
+
5
–0 –5 –10 15 20  
 

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