Bogen M330A Operating Manual

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I BOGEN®

MODEL M33OA

30 WATT PUBLIC ADDRESS AMPLIFIER

LEARSIEGLERINC. @®
BOGEN DIVISION

P 0 BOX 500
PARAMLS N I am:

V INSTALLATION AND OPERATING MANUAL

READ THOROUGHLY BEFORE OPERATING EQUIPMENT

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INTRODUCTION

The Bogen model M330A is a general purpose 30
watt public address amplifier. Seven inputs are pro
vided-three for microphones, tWo {Or magnetic phone
or tape, and two auxiliary inputs for ceramic phone or
other high level sound sources.

Separate volume controls are provided for the four
input channels, and a master volume control sets the
over-all gain. Bass and treble controls are provided
for adjusting the tonal balance.

TECHNICAL SPECIFICATIONS

POWER OUTPUT: 30 watts at 2% distortion; 50 watts
peak.
FREQUENCY RESPONSE: 20 to 20,000 cps 12 db
POWER RESPONSE: :3 db, 50 to 20,000 cps at 30
watts less than 5% distortion.
HUM AND NOISE:
MIC Input: 65 db below rated power
AUX Input: 80 db below rated power
MAG Input: 65 db below rated power
GAIN:
MIC Input:
AUX Input:
MAG Input:
SENSITIVITY:
MIC Input: 6 millivolts
AUX Input: 0.3 volts
MAG Input: 50 millivolts
INPUTS:
3 MIC high impedance (convertible to low impedance
with plug-in transformer)
2 MAG phono (or tape head)
2 AUX (high level, high impedance)

120 db
95 db
105 db

OUTPUTS:
4, 8 and 16 ohm speakers
25 volt (16 ohm) balanced
70 volt (163 ohm) (quick disconnect sockets only)
TONE CONTROL ACTION:
TREBLE: -l4/2 db to +10% db at 10 KC
BASS: -9 db to +13% db at 50 cps
CONTROLS:
MIC 1 Volume, INPUT 2 Volume, INPUT 3 Volume
AUX 1 AUX 2 Volume (fader type)
MIC 1 Selector (High or Low impedance)
INPUT 2 Selector (high impedance, low impedance
or mag-tape)
INPUT 3 Selector (high impedance, low impedance
or mag-tape)
MASTER Volume, BASS, TREBLE, POWER Switch
TUBES AND RECTIFIERS:
Two 7868, one 7247, two 6EU7, three silicon
rectifiers.
POWER CONSUMPTION: 120 watts
SHIPPING WEIGHT: 23 lbs.

ACCESSORIES

PLUG-IN TRANSFORMERS

Plug-in transformers permit this amplifier to be
used with low-impedance as well as high-impedance
microphones. Bogen transformer model TMSD is used
for 53-ohm input, model TM200 for 150 to 250 ohms,
and model TMSOO for 500 to 600 ohms. Installation of
the transformer is described in theInstallation section.

MODEL SR2 AND SR4 REMOTE CONTROLLER

The Remote Controller permits the user to control
the gain of the MIC 1, INPUT 2 and INPUT 3 inputs
from distances up to 2,000 feet from the amplifier
without sacrificing power or signal quality. It also
allows the user to mix and fade the three signal inputs.

MODEL LK-B LOOKING PLATE

The Model LK-8 Locking plate is designed to pre-
vent unauthorized tampering with controls of the ampli-
fier. It comes complete with instructions and a set of
two keys. As a safety factor, the key cannot be removed
when lock is in open position.

MODEL LPG-l PNONO PLAYER TOP

Model LPC-4 is a complete four-speed phono
player designed to be mounted directly on top of the
amplifier. The unit comes complete with all necessary
hardware. It can be easily installed and connected to
the amplifier with only a screwdriver. It includes a
vibration-isolated turntable and tone arm housing a
dual-stylus turn-over cartridge.

CARRYING OASE AND SPEAKERS

Carrying cases for M33OA portable systems are
available with speakers. The model CCvIZS includes a
12 high efficiency PM speaker in each section. Both
sections include 25 feet of interconnecting cable and
a plug.

MSK-I MONITOR SPEAKER

The MSK-l is an optional Monitor Speaker and
Volume Control Accessory. The MSK-l enables the
operator to monitor the sound output level at the am-
plifier in installations with remotely located speakers
or serves as an added convenience in any installation.