Bogen CSM Operating Manual

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m

STUDIO MIXER-PREAMPLIFIER

BCJCEEBI®

A DIVISION OF LEAR SIEGLEFI, INC.

MODEL CSM

DESCRIPTION

The Bogen Model CSM Studio Mixer-Preamplifier is a solid
state unit providing four balanoed, lowdmpedance microphone
channels. each with a gain control and a low-cut speech filter
switch. A rear panel switch converts microphone channel 4 to a
line input that is switchable for either 600~ohm line or bridging
input, and another rear panel switch converts microphone
channel 1 into a test tone oscillatori A master gain control sets

the composite output, whose level is shown on an illuminated
VU meter. A front panel meter range switch permits the meter
zero level to be set at either +4 dBm or +10 dBm

The mixer-preamplifier has a balanced high-level ontpUt that
provides up to #18 dBm into a 600-ohm line, and a balanced
low-level output to drive a low-impedance microphone input.
The Model CSM also has a two-level headphone jack that
permits the output to be monitored with headphones having a
600 to 2.000«ohm impedance range.

TECHNICAL SPECIFICATIONS

Rated Output:
Output Impedance:
Headphone Output:

Frequency Response:

Microphone Inputs:

Auxiliary Input:

Equivalent Input Noise:

Test Tone:
Distortion :
Gain :

Mixing and Control Interaction:

Indicators:

Semiconductors:

Con trols:

Operating Temperature Range:
Power Consumption:
Dimensions:

Weight:

Input/Output Connections:

Equivalent Input Hum and Noise:

Line. +18 dBm maximum; Mic Output, 62 mV
Line. 600 ohms: Mic Outputi 25 to 600 ohms

With Line output at +4 dBm and 600 to 2,000 ohm load: lst plug detent. 150 mV
Plug fully inserted, 250 mV

i 11/: dB 20 to 20,000 Hz

4 Lo-Z (25-600 ohm) balanced or unbalanced, transformer coupled. l convertible to Line
(600 ohm) or bridging (47k ohm)

None

-129 MW

-125 dBV

One MIC channel switchable to provide 700 Hz test tone
Less than 1% at +18 dBm, 20 to 20,000 Hz

"'1 Lo~Z Mic °" Line
Lo~Z MIC 30 dB 90 an
600 ohm/Bridging Line -20 dB 40 an

Active Mixing (No Gain Change with Additional Inputs) Control Interaction: less than 0.2 dB

Illuminated VU Meter with Two-Level Range
Switch, +10 dBm and +4 dBm

3 Integrated Circuits, 2 Transistors. 8 Diodes

4 Lo-Filter (Speech Filter. each Channel). Master Gain. 4 Microphone Gain. Meter Range,
Power On-Off. MIC/Line. Bridging Line/6004mm Line, Tone Osc:

-20° to +55°c

120 Vac 60 Hz @ .074 Amps: 24.28 Vdc @ 90 mA, capable of supplying 2 CSM-E extenders

11-3/8"W x 2-7/8"H x 7-3/4"D

5 lb.

MIC Input: 3-oin female (Cannon XLR); Line Output: 3/4 spaced binding posts;
Headphone Output: 2-circuit phonejack

Prlnted In USA

810

54-5636-03

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The CSM may be mounted in a standard [9-inch equipment
rack (using Bogen Model RPK-35 Rack Mounting Kit) orflush
within a wall (using Bogen Model WMK-l ln-Wall Mounting
Kit). It may be powered either from l20 Vac. 60 Hz or 24-28 Vdc
sources.

INSTALLATION

UNPACKING

The unit was carefully checked before leaving the factory.
Ins both the unit and its shipping container carefully for
indications of improper handling. Report any equipment
damage immediately to the distributor from whom the unit was
purchased. If the unit was shipped to you, notify the shipping
carrier without delay and place your claim.

POWER AND GROUNDING

PRIMARY AC POWER. The ac line cord has a three-prong
plug which should be plugged into a three-wire, grounded 120
volt. 60 Hz outlet. It is irn ortant to ound the unit. If a
grounded, three-wire outlet is not avaiIaEIe, install an adapter
(e.g.. Leviton No. 5017) and connect the pigtail lead to the
grounded wall plate mounting screw. If this screw is not

grounded, connect a wire from the GND temtinal of the unit to
a c0ndu1t pipe or other electrical system ground.

AUXILIARY DC POWER. The CSM may be powered from
an external 24 to 28 Vdc supply connected to the mixer-
preamplifier. The supply may remain connected even when the
unit is powered from a 120 Vac source. The power switch
disconnects both the dc and ac supplies, turning off both the

SWITCHCPAFT 280
OR EQUIVALENT
A) HEADPHONE OUTPUT CONNECTION

BOGEN IOOB 0?

,/\\(NOTE I)
EQUIVALENT /

I 2D

O

_*s

5) BALANCED MIC INPUT OR OUTPUT CONNECTION

.FOP MIC INPUT USE N XLR>3>I2C. ..
SWITCHCRAFT A3M,OP EQUIVALENT. FOR MIL _
OUTPUT USE BOGEN CON |,CANNON XLR>3-IIL,
OP EQUIVALENT.

2!FOR UNBALANCED MICS CONNECT PINS |&3
TOGETHER;CON\IECT MIC BETNEEN PINS 2

514313-01

£3.

Figure l - Headphone and Microphone Connections

.2.

mixer-preamplifier and any extenders powered from it, The
CSM is supplied with a pair of push-on lugs for connecting the
external dc supply to the EXT. SOURCE power input
receptacle.

CAUTION

Observe polarity on all dc power connections (red
to +).

INPUT/ OUTPUT CONNECTIONS

Make all input connections and output connections as
directed in table 1 and shown in figures I and 2.

Z-LEVEL HEW um CNANNEL I
ALIERPNCILEESRWW W5 swtrcncwv 2:0. LO~Z BALANCED MIC on
< 2425 we in amateur we». re": 5.5m
390m (not: I)
[SEE FIGIRE A)
. ' a

Q?

55

CHANtiL eu
z) - totem.
PRIMARY ER ESfzEEtfiw s E n
I20 vAc. m.70 MA mc on LINE wot.
m SELECTABLE AT
MIC OUTPUT. 500 on 4 x ems
czlwgweocau
EQJIVALENT
EOGEN ro-szaspl mutton:
, on AMP seen-2 cassava Poumnes
RED
NO. |' AWG
_ (MINIMUM)
BLACK
BOGEN vo-szes-oz
on AMP 5022.2
E E SE 5 mm

I ACCEPTS CANNON XLR-l-IZC.$WITCHCMFT Amen EQUIVALENT PLUG.

2 IF 3 WIRE WWED AC (INLET IS NOT AVAILAELE ,CONNECT WIRE
FROMGND POST TO ELECTRICAL SYSTEM GROUND.

Figure 2 - CSM Connection Diagram

ACCESSORIES

RPK-35 RACK PANEL

The Bogen Model RPK-35 rack panel is designed to mount
the CSM in a standard 19-inch sound rack. The rack panel is
finished in gray enamel.

WMK-I IN-WALL MOUNTING KIT

The Bogen Model WMK-l ln-Wall Mounting Kit isdesigned
to mount the CSM flush in a wall. Depth ofthc mounted unit is
3% inches.