Akg MB3 Handleiding

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T

MB3

MINI-BOUNDARY

™

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 supertocardioid pickup pattern, the

MB 3 greatly reduces ambient noise and

pickup room reverberation. e result aofThis

clearer, re intelligible sound.mo

Oe bottom of e mic is a tubulapower n ththr

module with a 3-pin XLR-type output connec-

tor. It is powered b-phantom power, y 1248V

anhad s a low-impedance balanced mic-level

output.

Features

•

Small, inconspicuous.

•

Installs permanently table top, wall inor

ceiling.

•

Clean, clear, natural sound.

•

Low-Z balanced mic-level output prevents

huanm d high-frequency loss.

Specifications

Type:

Phase Coherent rdioid.Ca

Element:

Electret condenser.

Frequency response (typical):

50 Hz 15,000 Hz toat

30 degrees incidence rface (see Fig. 1).tosu

Polar pattern:

Half-superrdioid (superrdioid cacain

the hemisphe above rethe 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

0˚

130˚

•

Removable grille assembly n be painted.ca

How to Paint e Microphoneth

1. Using a small screwdriver, pry n e sideopeon

of e base, then ththe 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

201001K 10K

Frequency inHz

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.reno

4. Allow completely dry.to

5. Make sure the D LEis 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, oneinofeacor

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 SP3% THD.

Polarity:

Positive (inward) pressure on the

diaphragm produces positive voltage on n 2pi

with respect n topi3.

Operating voltage:

Phantom power, -48 volts 12DC

on pins 2 d 3 with respect n 1 output antopiof

connector.

Current drain:

4 mA nominal.

Connector:

3-pin pro audio, XLR-M type.

Cable:

None supplied. e Ustwo-conductor shielded

mic cable.

Materials:

High-impact molded plastic d steelan

mesh mic grillesteechassis., l

300˚

270˚

240˚

330˚0˚30˚

FRONT

–0

–5

–10

–15

–20

REAR

1 kHz

200 Hz

5 kHz

60˚

90˚

120˚

lectern, install an open rface. Do notitonsu

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

210˚180˚ 150˚

Ceilings:

When mounting mics e ceiling, inth

use as w mics as possible, d t them feanpuin

front of peoplspeakingthe e —not directly

overhead.

Note:

The system gain-before-feedback may

not be adequate ceiling mount applications in

because mic is r from its user.e thfa

Optional accessories :

PH1A phantom power

supply channel, battery -adapter(1orDC

powered). 4A phantom power supply PH(4

channels, AC powered).

*1 pascal = 1dynes/cm0

2

= 10 microbars = 94 dB SPL.

30˚

0˚

Vertical-Plane Polar Response

60˚90˚ 120˚

1 kHz

200 Hz

5 kHz

FRONT REAR

+5 10 15 –0 –5 –––20

150˚

180˚

Product specificaties