Akg MB-4 Handleiding

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T

MB4

MINI-BOUNDARY

™

MICROPHONE

he AKG/Crown

®

MB4 a miniature is

boundary microphone for multi-miking

applications such as teleconferencing,

distance learning, boardrooms,

courtrooms, d security applications. an

Double-sided sticky tape is provided for

attaching the unit under shelves, on walls,

etc.

Thanks to its supercardioid pickup pattern,

the MB4 greatly reduces ambient noise

and pickup of room reverberation. The

result is a clearer sound.

The MB4 has a 15-foot attached cable

leading to an XLR-type output connector

with built-in mic electronics. It is powered

by 12-48V phantom power, and is low-

impedance balanced.

Features

•

Tiny, inconspicuous.

•

Can be used without putting holes in

the table.

•

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).

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

•

Removable grille assembly n be painted.ca

How to Paint e Microphoneth

1. Using a small screwdriver, pry open e sideon

of e base, then ththe other side

2. Remove the foam liner.

3. Wearing a dust mask, spray-paint e grilleth

assembly. Be sure grille holes a re not clogged.

4. Allow completely dry.to

5. Make sure the D LEis properly aligned.

6. Carefully place the grille assembly over the

base, and snap in place.

Installation

1.

In a table, typical placement for each

mic is

an arm s length from e user. Install’th

one

microphone in front each person, oneofor

between every two people.

If e microphone will be used on ath

lectern,

install an open rface. Do notitonsu

install a in

cavity recessed area as the frequency or

response d polar pattern will degraded.anbe

2.

Orient the mic so the readable lable faces

the user (right-side-up).

3.

Plug a mic cable with a female XLR-type

connector into the power module. Connect the

other end of the cable to a phantom power

supply. Or if your mixer has phantom power,

connect the mic cable directly to a mic input

and turn on phantom power.

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 THD.SP3%

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:

Permanently attached, black, 15-foot

(4.572 m), 2-conductor shielded cable from mic

to power module or interface. No other cable

supplied. Use two-conductor shielded mic cable

from power module to mixer.

Materials:

High-impact molded plastic d steelan

mesh mic grillesteepower module., l

Finish:

Satin black.

Net weight:

2.7 ounces (78 grams).

Operating temperature range:

-10° to +50°C, or +14°

to +122°F.

Net weight:

Microphone: 0.7 ounces (19.8 grams)

Power module:

2.8 ounces (78.6 grams)

Dimensions :

See Fig. 4.

Included aessoriescc: Double-sided tape for

fastening under shelves, etc., for theatrical

applications.

Optional accessories :

PH1A phantom power

supply (1 channel, battery -adapterorDC

powered). 4A phantom power supply PH(4

channels, AC powered).

*1 pascal = 1dynes/cm0

2

= 10 microbars = 94 dB SPL.

Fig. 1. Frequency Response

Fig. 2. Horizontal-Plane Polar Response

Fig. 3. Vertical-Plane Polar Response

Product specificaties