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Crown International, Inc.
1718 W. Mishawaka Rd.
Elkhart, IN 46517-9439
TEL: 574-294-8000
FAX: 574-294-8FAX
www.crownaudio.com
MB-2
4/08 103276-6A
Fig. 3
Fig.5
Vertical-Plane Polar Response
Installation
1. Typical placement for each mic is at arm’s length
from the user. Install one microphone in front of
each person, or one between every two people.
If the microphone will be used on a lectern, install
it on an open surface, do not install in a cavity or
recessed area as the frequency response and polar
pattern will be degraded.
2. If you want to fl ush-mount the jack, counter-
bore a hole 0.625-in. (1.59-cm) diameter, 0.10-in.
(0.254-cm) deep. In the center of the counterbore,
drill a hole 0.5-in. (1.27-cm) diameter for each
mic’s cylindrical phone jack. Insert the jack in the
hole and thread on the nut.
If you do not want to fl ush-mount the jack, drill a
hole 0.5-in (1.27-cm) diameter for each mic’s cy-
lindrical phone jack. Insert the jack in the hole and
thread on the nut.
On the bottom of the MB-2 is a removable
0.0625-
in. (0.159-cm) diameter pin to secure the mic in
position. Drill a hole for this pin 0.801 in. (2.0345
cm) from the center of the phone-jack hole, in the
desired direction.
3. Wire the mic to the MB-100 interface as de-
scribed in the interface data sheet.
4. Plug each mic into its jack. Orient the mic so
the word “Crown” is readable by the user (right-
side-up).
Architects’ and Engineers’ Specifi cations
The microphone shall be the Crown model MB-2 or
equivalent. The microphone shall be a half-super-
cardioid electret condenser type. The microphone
shall use the principle of phase coherency achieved
by mounting a small-diameter element very near
a boundary. This eliminates comb fi ltering in the
audible spectrum.
The microphone shall exhibit excellent off-axis
response and gain-before-feedback. Each mic shall
have a bottom-mounted stereo phone plug.
The user shall supply a cylindrical phone jack.
The mic shall be used with a pluggable terminal
block and an MB-100 interface (not included). The
interface shall provide operating voltage to each
microphone, and convert its output signal to low-
impedance balanced.
Nominal sensitivity shall be 22 mV/Pa. Maximum
SPL shall be 120 dB SPL for 3% THD. Equivalent
noise shall be 22 dBA nominal. Frequency re-
sponse shall be 50 Hz to 15 kHz with a uniform off-
axis response, about 20 dB down at the rear nulls.
The Crown model MB-2 is specifi ed.
Warranty
Crown professional microphones are guaranteed
against malfunction for a period of three years
from date of original purchase. See enclosed war-
ranty sheet for additional information.
Service
If the microphone does not function properly,
check that it is aimed correctly and is confi gured
and connected as described in the MB-100 in-
terface data sheet. Check the slide-switch setting
in the interface. If there is hum or no signal, fi rst
repair or replace the cable.
If you determine the microphone product(s)
is defective, return the complete product in its
original packaging to: Crown Factory Service,
1718 West Mishawaka Road, Elkhart, IN 46517-
9439. A Service Return Authorization (SRA) is
required for product being sent to the factory for
service. An SRA can be completed on line at
www.crownaudio.com/support/factserv.htm.
For further assistance or technical support call
800-342-6939.
Dimensions
Fig.4
©2008 Crown Audio
®
, Inc. Specifi cations subject
to change without prior notice. Latest information
available at www.crownaudio.com. Mini-boundary is a
trademark, and Crown and Crown Audio are registered
trademarks of Crown International.