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T

MB3

MINI-BOUNDARY

™

MICROPHONE

he AKG/Crown

®

MB3 is a miniature

boundary microphone for multi-miking

applications such as teleconferencing,

distance learning, boardrooms,

courtrooms, and security applications. This

low-profile, circular mic

permanently installs

into a hole drilled in a

table, lectern, or ceiling.

Thanks to its supercardioid pickup pattern, the

MB3 greatly reduces ambient noise and

pickup of room reverberation. The result is a

clearer, more intelligible sound.

On the bottom of the mic is a tubular power

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

tor. It is powered by 12-48V phantom power,

and has a low-impedance balanced mic-level

output.

Features

•

Small, inconspicuous.

•

Installs permanently in table top, wall or

ceiling.

•

Clean, clear, natural sound.

•

Low-Z balanced mic-level output prevents

hum and high-frequency loss.

Specifications

Type:

Phase Coherent Cardioid.

Element:

Electret condenser.

Frequency response (typical):

50Hz to 15,000 Hz at

30degrees incidence to surface (see Fig. 1).

Polar pattern:

Half-supercardioid (supercardioid in

the hemisphere above 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

0˚

130˚

•

Removable grille assembly can be painted.

How to Paint the Microphone

1.Using a small screwdriver, pry open one side

ofthe base, then the other side (Fig. 5).

Open-circuit sensitivity (typical):

22mV/Pa* (–33

dB re 1 volt/Pa).

Power sensitivity:

–30.5 dB re 1 mW/Pa*.

EIA rating:

–125 dBm.

Equivalent noise level (self-noise):

22dB SPL

–35

201001K

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 are not clogged.

4.Allow to completely dry.

5.Make sure the LED isproperly aligned.

6.Carefully place the grille assembly over the

base, and snap inplace.

Installation

Tables:

Ina table, typical placement for each

mic is an arm’s length from the user. Install

one microphone in front of each person, or one

between every two people.

Lecterns:

Ifthe microphone will be used on a

typical (0 dB=0.0002 dyne/cm

2

), A-weighted.

S/N ratio:

72dB at 94 dB SPL.

Maximum SPL:

120 dB SPL at 3%THD.

Polarity:

Positive (inward) pressure on the

diaphragm produces positive voltage on pin 2

with respect to pin 3.

Operating voltage:

Phantom power, 12-48 volts DC

on pins 2 and 3 with respect to pin 1 of output

connector.

Current drain:

4 mA nominal.

Connector:

3-pin pro audio, XLR-M type.

Cable:

None supplied. Use two-conductor shielded

mic cable.

Materials:

High-impact molded plastic and steel

mesh mic grille, steel chassis.

300˚

270˚

240˚

330˚

0˚

30˚

FRONT

–0

–5

–10

–15

–20

REAR

1 kHz

200Hz

5 kHz

60˚

90˚

120˚

lectern, install it on an open surface. Do not

install ina cavity or recessed area as the fre-

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 in the ceiling,

use as few mics as possible, and put them in

front of the people speaking—not directly

overhead.

Note:

The system gain-before-feedback may

not be adequate in ceiling mount applications

because the mic is far from its user.

Optional accessories:

PH1A phantom power

supply (1 channel, battery or DC-adapter

powered). PH4A phantom power supply (4

channels, AC powered).

*1 pascal = 10 dynes/cm

2

= 10 microbars = 94 dB SPL.

30˚

0˚

Vertical-Plane Polar Response

60˚90˚120˚

1 kHz

200Hz

5 kHz

FRONT REAR

+5 –0 –5 –10 –15 –20

150˚

180˚

Produktspecifikationer