Fig. 4
Fig.5
FRONT
BOTTOM VIEW
PHONE PLUG
SCREWDRIVER
LIFT WASHER AND
PRY OPEN HERE AND
ON OPPOSITE SIDE
MB3
Nominal sensitivity shall be 22 mV/Pa. Maxi-
mum SPL shall be 120 dB SPL for 3% THD.
Equivalent noise shall be 22 dBA nominal.
Frequency response shall be 50 Hz to 15 kHz
with a uniform off-axis response, about 20 dB
down at the rear nulls.
The AKG/Crown model MB3 is specified.
1. Drill a 1.125 in. (2.858 cm) diameter hole for
each mic.
2. Insert the mic tube through the hole. Orient
the mic so the readable label faces the user.
3. Under the table, or behind the ceiling or wall
panel, slide the ring over the tube and tighten
the set screw.
4. Plug a mic cable with a female 3-pin XLR-
type connector into the mic. Connect the other
end of the cable to a phantom power supply. Or,
if your mixer has phantom power, connect the
AFTER REASSEMBLY
RESEAT WASHER
mic cable directly to a mic input and turn on
phantom power.
Architects
’ and Engineers’ Specifications
The microphone shall be the AKG/Crown model
MB3 or equivalent. The microphone shall be a
half-supercardioid 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 filtering in the audible spec-
trum.
The microphone will exhibit excellent off-axis
response and gain-before-feedback. The mic
shall have a bottom-mounted 3-pin pro audio
XLR-type male connector. Powering shall be by
12-48V phantom power.
Warranty
AKG/Crown professional microphone products
are guaranteed unconditionally against
malfunction from any cause for a period of
three years from date of original purchase. See
enclosed warranty sheet for additional
information.
Service
If the microphone does not function properly,
check that it is aimed correctly and is con-
nected as described in this data sheet. If there
is hum or no signal, first repair or replace the
cable.
If you determine that the microphone product
is defective, return the complete product in its
original packaging to one of the addresses
below. For further assistance or technical
support call
the international helpdesk at
+43 676 83200 888.
.
VCC
R1
R2
W1
C2
VCC
8
3 +
U1A
1
C5
R11
MICROPHONE CAPSULE
W2
C1
W3
2 –
R5
4
R8
C4
C12
+
VCC
3
2
U2
1
4
7
5
6
R15
C9
C10
1 2
VCC
+
C3
R3
R4
R6
R7
U1B
6 – 7
5 +
R9
R10
C7 +
+
C6
R12
C8
+
R13
R14
R16
Q1
R17
C11
P1
3 A3M
CONNECTOR
INSERT
PINS
MB3 Schematic
MICROPHONE ELECTRONICS
AKG ACOUSTICS GMBH
LAXENBURGER STRASSE 254, 1230 VIENNA/AUSTRIA
AKG ACOUSTICS, U.S. SERVICE
24950 GROVE VIEW ROAD, MORENO VALLEY, CA 92551, U.S.A
© 2015 HARMAN International Industries, Incorporated. All rights reserved. AKG is a trademark of AKG Acoustics GmbH, registered in the
United States and/or other countries.
Features, specifications and appearance are subject to change without notice.
www.akg.com