AKG MB3 Bedienungsanleitung
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MB3
MINI-BOUNDARY
â„¢
MICROPHONE
he AKG/Crown
®
MB3 a miniature is
boundary microphone for multi-miking
applications such as teleconferencing,
distance learning, boardrooms,
courtrooms, d security applications. This an
low- ole, circular micpr
permanently installs
into a hole drilled ain
table, lectern, ceiling.or
Thanks its superto cardioid pickup pattern, the
MB 3 greatly reduces ambient noise and
pickup room reverberation. e result aof Th is
clearer, re intelligible sound.mo
O e bottom of e mic is a tubula power n th th r
module with a 3-pin XLR-type output connec-
tor. It is powered b - phantom power, y 12 48V
an had s a low-impedance balanced mic-level
output.
Features
•
Small, inconspicuous.
•
Installs permanently table top, wall in or
ceiling.
•
Clean, clear, natural sound.
•
Low-Z balanced mic-level output prevents
hu anm d high-frequency loss.
Specifications
Type:
Phase Coherent rdioid.Ca
Element:
Electret condenser.
Frequency response (typical):
50 Hz 15,000 Hz to at
30 degrees incidence rface (see Fig. 1).to su
Polar pattern:
Half-super rdioid (super rdioid ca ca in
the hemisphe above re the primary boundary).
See
Figs. 2 and 3.
Impedance:
150 ohms, balanced (recommended
load impedance 1000 ohms or greater).
Fig. 1
+15
+10
+5
dB 0
–5
–10
–15
–20
–25
–30
Frequency Response
0Ëš
130Ëš
•
Removable grille assembly n be painted.ca
How to Paint e Microphoneth
1. Using a small screwdriver, pry n e sideope on
of e base, then th the other side (Fig. 5).
Open-circuit sensitivity (typical):
22 mV/Pa* (–33
dB 1 volt/Pa).re
Power sensitivity:
–30.5 dB 1 mW/Pa*. re
EIA rating:
–125 dBm.
Equivalent noise level (self-noise):
22 dB SPL
–35
20 100 1K 10K
Frequency in Hz
Fig. 2
Horizontal-Plane Polar Response
2. Remove the foam liner.
3. Wearing a dust mask, spray-paint the grille
assembly. Be sure grille holes a t clogged.re no
4. Allow completely dry.to
5. Make sure the D LE is properly aligned.
6. Carefully place e grille assembly over theth
base, and snap in place.
Installation
Tables:
In a table, typical placement for each
mic an armis ’s length from e user. Installth
one microphone front h person, onein of eac or
between every two people.
Lecterns:
If the microphone will be used on a
typical dB=0.0002 dyne/cm(0
2
), A-weighted.
S/N ratio:
72 dB at dB SPL.94
Maximum : SPL
120 dB L at SP 3% THD.
Polarity:
Positive (inward) pressure on the
diaphragm produces positive voltage on n 2pi
with respect n to pi 3.
Operating voltage:
Phantom power, -48 volts 12 DC
on pins 2 d 3 with respect n 1 output an to pi of
connector.
Current drain:
4 mA nominal.
Connector:
3-pin pro audio, XLR-M type.
Cable:
None supplied. e Us two-conductor shielded
mic cable.
Materials:
High-impact molded plastic d steelan
mesh mic grille stee chassis., l
300Ëš
270Ëš
240Ëš
330Ëš 0Ëš 30Ëš
FRONT
–0
–5
–10
–15
–20
REAR
1 kHz
200 Hz
5 kHz
60Ëš
90Ëš
120Ëš
lectern, install an open rface. Do notit on su
install in a cavity recessed area as the fre-or
quency response and polar pattern will be
degraded.
Finish:
Satin black.
Net weight:
2.7 ounces (78 grams).
Dimensions :
See Fig. 4.
Fig. 3
210Ëš 180Ëš 150Ëš
Ceilings:
When mounting mics e ceiling, in th
use as w mics as possible, d t them fe an pu in
front of peopl speakingthe e —not directly
overhead.
Note:
The system gain-before-feedback may
not be adequate ceiling mount applications in
becaus e mic is r from its user.e th fa
Optional accessories :
PH1A phantom power
supply channel, battery -adapter(1 or DC
powered). 4A phantom power supply PH (4
channels, AC powered).
*1 pascal = 1 dynes/cm0
2
= 10 microbars = 94 dB SPL.
30Ëš
0Ëš
Vertical-Plane Polar Response
60Ëš 90Ëš 120Ëš
1 kHz
200 Hz
5 kHz
FRONT REAR
+5 10 15 –0 –5 –––20
150Ëš
180Ëš
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 L shall be 0 dB L for SP 12 SP 3% THD.
Equivalent noise shall be 22 dBA nominal.
Frequency response shall be 50 Hz to 15 kHz
with a uniform off-axis response, t 2abou 0 dB
down at e rear nulls.th
The AKG/Crown model MB3 specied.is
1. Drill a 1.125 . (2.858 cm) diameter hole forin
each mic.
2. Insert e mic tube through e hole. Orientth th
th the mic so e readable label faces the user.
3. Under e table, behind th or the ceiling wall or
panel, slide e ring over th the tube d tighten an
the set screw.
4. Plug a mic cable with a female 3-pin XLR-
type connector into e mic. Connect e other th th
end of e cable th to a phantom power supply. Or,
if your mixer s phantom power, connect theha
AFTER REASSEMBLY
RESEAT WASHER
mic cable directly a mic input d turn to an on
phantom power.
Architects d Engineers Specications ’an ’
The microphone shall be e AKG/Crown model th
MB3 equivalent. or The microphone shall be a
half-super rdioid electret condenser type. Theca
microphone shall e us the principle phaseof
coherency achieved by mounting a small-
diameter element ry near a boundary. This ve
eliminates comb filtering e audible spec- in th
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 48- V phantom power.
Warranty
AKG/Crown professional microphone products
are
guaranteed unconditionally against
malfunction
from y cause for a period an of
three years from
date of original purchase. See
enclosed warranty sheet for additional
information.
Service
If e microphone s t function properly, th doe no
check that it is aimed correctly d con-an is
nected as described in this a sheet. theredat If
is m no signal, rst repair replace thehu or or
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 92 , U.S.A , 551
© 2015 HARMAN International Industries, Incorporated. All rights reserved. is a trademark of AKG Acoustics GmbH, registered in the AKG
United States and/or other countries.
Features, specications and appearance are subject to change without notice.
www.akg.com
Produktspezifikationen
| Marke: | AKG |
| Kategorie: | Mikrofon |
| Modell: | MB3 |
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