Crown Audio MB-200 Prospecto

he MB-100 is an electronics interface that powers 
 up to four Crown

®

 mini-boundary™ MB-1, MB-2, 

 or MB-4/E microphones. This interface for four mics 

reduces the size and cost of the microphone system and 
reduces installation time.

The MB-100 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.

Two microphones can be wired to each pluggable terminal 
block, which plugs into the MB-100 or MB-200 interface. 
Pluggable terminal blocks are also provided for the bal-
anced outputs on the interface, and for remote switch 
sensing.

The interface is powered by 18 to 48V phantom power 
from a mixer or a phantom power supply.

Wiring Interface Mic Inputs
Before installing the mics, wire them to the included plug-
gable terminal blocks (PTBs) as described below:

1.  For the MB-1 and MB-2 mics, solder the proper length 
of cable to each mic jack as follows:

   Sleeve (common ground) to cable shield

   Tip (audio) to cable (+) lead

   Ring (LED) to cable (–) lead

2.  Wire the cables for two adjacent mics to the PTB as 
shown in Fig. 2.

If you do NOT want the LEDs to light, disconnect the leads 
from PTB terminals 2 and 5.

3.  Similarly, wire MICS 3 and 4 (if used) to another 
6-prong PTB.

Output impedance:  150 ohms, balanced (recommended 

load impedance 1000 ohms or greater).

Polarity:  Positive (inward) pressure on diaphragm produc-

es positive voltage on output terminal 1 with respect to 
terminal 3, and on terminal 4 with respect to terminal 6.

Operating voltage:  Phantom power, 18 to 48V DC on 

output terminals 1 and 3 with respect to terminal 2, and 
on terminals 4 and 6 with respect to terminal 5.

Operating temperature range:  –10° to +50° C, or +14° 

to +122° F. 

Current drain:  5 mA nominal per mic.

Cable connectors (supplied with MB-100 or MB-200 

interface):  

•  Pluggable terminal block (PTB) for connecting two micro-

phones to two mic inputs on the interface. Two of these 
PTBs are supplied, for use with up to four mics.

•  PTB for connecting two mic-level outputs to two mixer 

mic inputs. Two of these PTBs are supplied, for use with 
up to four mics. 

• PTB for connecting two mic on/off switches (switches not 

supplied). Two of these PTBs are supplied, for use with 
up to four mics.

  (MB-200 only) PTB for external switch-closure sensing. 

Each PTB connects to two external circuits (circuits not 
supplied) that sense closure of the mic on/off switch. 
Two of these PTBs are supplied, for use with up to four 
mics .

Chassis connectors:  

 

MIC1/MIC2 IN (connects to mics 1 and 2).

 

MIC3/MIC4 IN (connects to mics 3 and 4, if used).

 

MIC1/MIC2 OUT (connects to mixer mic inputs 1 and 2).

 

MIC3/MIC4 OUT (connects to mixer mic inputs 3 and 4, 
if used).

 

MIC1/MIC2 SWITCH (connects to on/off switches for 
mics 1 and 2).

 

MIC3/MIC4 SWITCH (connects to on/off switches for 
mics 3 and 4).

 

MIC1/MIC2 external switch-closure sensing (MB-200 
only).

 

MIC3/MIC4 external switch-closure sensing (MB-200 
only).

Cable:  None supplied. For the MB-1 and MB-2, use two-

conductor shielded mic cable between phone jack and 
pluggable terminal block. For the MB-4/E, the mic cable 
is permanently attached to the microphone. Use two-
conductor shielded mic cable between interface output 
and mixer input. Use twisted-pair cable between each 
user switch and interface.

Materials:  Steel chassis.

Finish:  Satin black.

Net weight:  2 pounds, 5 ounces (1.048 kilograms).

Dimensions:  See Fig. 1.

9.31" (23.6 CM)

C-C

9.75" (24.8 CM)

8.89" (22.6 CM)

4.00" (10.2 CM)

C-C

.190" (0.5 CM)

DIA. HOLE

4 PLACES

1.06" (2.7 CM)

MB-100 and MB-200 Dimensions

Wiring Interface Outputs
Please refer to Fig. 3. Repeat this wiring for another inter-
face output (if used).

Wiring Mic On/Off Switches
As supplied from the factory, the mics are always on. For 
optional user control of each microphone, you can use 
either a momentary or a push-on/push-off SPST switch 
(not supplied). Proceed as described below:

1.  Two switches connect to one pluggable terminal block 
(PTB). Run a twisted pair from each switch to a 4-prong 
PTB, and connect as described below (Fig. 4). Wire polarity 
does not matter. 

2

6

5

3

1

PTB

4

TO INTERFACE “MIC 1 MIC 2 OUT”

TO MIXER

MIC 1 IN

TO MIXER

MIC 2 IN

4 AUDIO +
5 SHIELD
6 AUDIO –

1 AUDIO +
2 SHIELD
3 AUDIO –

Switch for mic 1 to PTB terminals 1 and 2

Switch for mic 2 to PTB terminals 3 and 4

2.  Similarly, wire switches for mics 3 and 4 (if used) to 
another PTB.

Wiring for External Switch-Closure Sensing (MB-200 
only)
If external switch-closure sensing is desired, wire two 
sensing circuits to one PTB as shown in Fig. 5. Repeat this 
wiring for another pair of mics (if used).

Setting Internal Switch, Gating, and EQ Controls
Remove the MB-100 interface cover. Locate the four slide 
switches, one for each mic (see Fig. 6). Set each switch to 
one of these modes:

  Push-on/push-off

  Momentary on (press-to-talk)

  Momentary off (mute or privacy button)

  Set the low-cut and internal-gate defeat as desired for 
each mic. Low-cut is –7 dB at 100 Hz.

2

6

5

4

3

1

PTB

TO MIC 2

TO MIC 1

TO INTERFACE “MIC 1 MIC 2 IN”

1 TIP (AUDIO)
2 RING (LED)
3 SLEEVE (GND)

4 TIP (AUDIO)
5 RING (LED)
6 SLEEVE (GND)

1 WHT
2 RED
3 SHIELD

4 WHT
5 RED
6 SHIELD

MB-4/E ONLY

1

2

3

4

PTB

1 SW1
2 SW1
3 SW2
4 SW2

TO INTERFACE

“EXTERNAL SWITCH”

TO SWITCH
FOR MIC 1
OR
AUTOMIXER
LOGIC OUT

TO SWITCH
FOR MIC 2
OR 
AUTOMIXER
LOGIC OUT

• Interfaces Crown MB-1, MB-2, or MB-4/E 
microphones to a mixer with phantom power

• Interface powers up to four mics via phantom 
power from mixer and provides four balanced 
low-impedance outputs

• Pluggable terminal block (Phoenix type) 
connectors

• MB-100 provides programmable mic switch-
ing

• MB-200 also has remote switch sensing via 
optical coupler