Kramer VM-1120 User manual

Kramer Electronics, Ltd.
Preliminary
USER MANUAL
Model:
VM-1120
1:10 Balanced Stereo Audio Distributor

Contents
i
Contents
1 Introduction 1
2 Getting Started 1
2.1 Quick Start 2
3 Overview 3
4 Your Balanced Stereo Audio Distributor 3
5 Installing the VM-1120 in a Rack 6
6 Connecting Your Balanced Stereo Audio Distributor 6
6.1 Connecting a 1:20 Mono DA 7
6.2 Connecting a 2x1:10 Mono DA 8
6.3 Connecting a 1:10 Stereo DA 9
6.4 Connecting a 2x1:5 Stereo DA 10
7 Setting the VM-1120 11
8 Technical Specifications 12
Figures
Figure 1: VM-1120 1:10 Balanced Stereo Audio Distributor 4
Figure 2: 1:20 Mono DA Configuration 7
Figure 3: 2x1:10 Mono DA Configuration 8
Figure 4: 1:10 Stereo DA Configuration 9
Figure 5: 2x1:5 Stereo DA Configuration 10
Figure 6: Using the Selector Button 11
Tables
Table 1: Front Panel VM-1120 1:10 Balanced Stereo Audio Distributor Features 5
Table 2: Rear Panel VM-1120 1:10 Balanced Stereo Audio Distributor Features 5
Table 3: VM-1120 Technical Specifications 12

Introduction
1
1 Introduction
Welcome to Kramer Electronics! Since 1981, Kramer Electronics has been
providing a world of unique, creative, and affordable solutions to the vast
range of problems that confront the video, audio, presentation, and
broadcasting professional on a daily basis. In recent years, we have
redesigned and upgraded most of our line, making the best even better! Our
1,000-plus different models now appear in 11 groups
1
that are clearly
defined by function.
Thank you for purchasing your Kramer VM-1120 1:10 Balanced Stereo
Audio Distributor.
This product is ideal for the following typical applications:
Audio duplication and production studios, delivering undiminished
quality duplicates
Recording studios
Broadcast studios for on-line signal distribution
The package includes the following items:
VM-1120 1:10 Balanced Stereo Audio Distributor
Power cord
2
This user manual
3
2 Getting Started
We recommend that you:
Unpack the equipment carefully and save the original box and
packaging materials for possible future shipment
Review the contents of this user manual
Use Kramer high-performance high-resolution cables
4
1 GROUP 1: Distribution Amplifiers; GROUP 2: Switchers and Matrix Switchers; GROUP 3: Control Systems;
GROUP 4: Format/Standards Converters; GROUP 5: Range Extenders and Repeaters; GROUP 6: Specialty AV Products;
GROUP 7: Scan Converters and Scalers; GROUP 8: Cables and Connectors; GROUP 9: Room Connectivity;
GROUP 10: Accessories and Rack Adapters; GROUP 11: Sierra Products
2 We recommend that you use only the power cord supplied with this device
3 Download up-to-date Kramer user manuals from our Web site at http://www.kramerelectronics.com
4 The complete list of Kramer cables is on our Web site at http://www.kramerelectronics.com

KRAMER: SIMPLE CREATIVE TECHNOLOGY
Getting Started
2
2.1 Quick Start
This quick start chart summarizes the basic setup and operation steps.

Overview
3
3 Overview
The VM-1120 is a high performance balanced stereo audio DA (distribution
amplifier) using XLR connectors that includes:
Front panel output level trimmer controls
Active J-FET amplifying circuitry that ensures hum-free, full-
bandwidth operation
A high-power discrete buffering system providing excellent
performance
You can configure your VM-1120 as a mono DA (2x1:10 or 1:20) or as a
stereo DA (2x1:5 or 1:10).
Achieving the best performance means:
Connecting only good quality connection cables, thus avoiding
interference, deterioration in signal quality due to poor matching,
and elevated noise levels (often associated with low quality
cables)
Avoiding interference from neighboring electrical appliances that
may adversely influence signal quality
Positioning your Kramer VM-1120 in a location free from
moisture and away from excessive sunlight and dust
4 Your Balanced Stereo Audio Distributor
Figure 1 illustrates the front and rear panels of the VM-1120. Table 1 and
Table 2 define the front and rear panels of the VM-1120, respectively.

KRAMER: SIMPLE CREATIVE TECHNOLOGY
Your Balanced Stereo Audio Distributor
4
Figure 1: VM-1120 1:10 Balanced Stereo Audio Distributor

Your Balanced Stereo Audio Distributor
5
Table 1: Front Panel VM-1120 1:10 Balanced Stereo Audio Distributor Features
# Feature Function
1 Power LED Illuminates when the unit is powered on
2 1:10 / 2x1:5 Button Push in to select 2x1:5
1
, release to select 1:10
2
3
LEFT
Level B and A Trimmers Adjusts
3
the output signal level for OUTPUTS A and B
4 1:10 / 2x1:5 Button Push in to select 2x1:5
1
, release to select 1:10
2
5
RIGHT
Level B and A Trimmers Adjusts
3
the output signal level for OUTPUTS A and B
Table 2: Rear Panel VM-1120 1:10 Balanced Stereo Audio Distributor Features
# Feature Function
6 INPUT A XLR Female Connector Connects to the source A
7 INPUT B XLR Female Connector Connects to the source B
8 OUT A XLR Male Connector Connects to the acceptor A (from 1 to 5)
9 OUT B XLR Male Connector Connects to the acceptor B (from 1 to 5)
10 Power Connector with Fuse 230V AC, 50/60Hz, (115V AC, U.S.A.) power inlet
11 Power Switch Turns the unit ON and OFF
1 Splits inputs A and B to outputs 1A-5A and 1B-5B, respectively
2 Splits input A to all 10 outputs
3 Insert a screwdriver into the small hole and carefully rotate it, trimming the OUTPUT level

KRAMER: SIMPLE CREATIVE TECHNOLOGY
Installing the VM-1120 in a Rack
6
5 Installing the VM-1120 in a Rack
This section describes how to install the VM-1120 in a rack.
Before Installing in a rack How to Rack Mount
Before installing in a rack, be sure that the environment is
within the recommended range:
Operating temperature range +5to +45C (41to 113F)
Operating humidity range 10 to 90% RHL, non-condensing
Storage temperature range -20to +70C (-4to 158F)
Storage humidity range 5 to 95% RHL, non-condensing

CAUTION!!
When installing on a 19" rack, avoid hazards by taking
care that:
1. It is located within the recommended environmental
conditions, as the operating ambient temperature of a
closed or multi unit rack assembly may exceed the
room ambient temperature.
2. Once rack mounted, enough air will still flow around
the machine.
3. The machine is placed straight in the correct
horizontal position.
4. You do not overload the circuit(s). When connecting
the machine to the supply circuit, overloading the
circuits might have a detrimental effect on overcurrent
protection and supply wiring. Refer to the appropriate
nameplate ratings for information. For example, for
fuse replacement, see the value printed on the
product label.
5. The machine is earthed (grounded) in a reliable way
and is connected only to an electricity socket with
grounding. Pay particular attention to situations where
electricity is supplied indirectly (when the power cord
is not plugged directly into the socket in the wall), for
example, when using an extension cable or a power
strip, and that you use only the power cord that is
supplied with the machine.
To rack-mount a machine:
1. Attach both ear brackets to the
machine. To do so, remove the
screws from each side of the
machine (3 on each side), and
replace those screws through the
ear brackets.
2. Place the ears of the machine
against the rack rails, and insert the
proper screws (not provided)
through each of the four holes in the
rack ears.
Note that:
In some models, the front panel
may feature built-in rack ears
Detachable rack ears can be
removed for desktop use
Always mount the machine in the
rack before you attach any cables
or connect the machine to the
power
If you are using a Kramer rack
adapter kit (for a machine that is not
19"), see the Rack Adapters user
manual for installation instructions
(you can download it at:
http://www.kramerelectronics.com)
6 Connecting Your Balanced Stereo Audio Distributor
You can easily connect the following configurations:
1:20 mono DA (see section 6.1)
2x1:10 mono DA (see section 6.2)
1:10 stereo DA (see section 6.3)
2x1:5 stereo DA (see section 6.4)

Connecting Your Balanced Stereo Audio Distributor
7
6.1 Connecting a 1:20 Mono DA
To configure a 1:20 mono DA, as illustrated in Figure 2, do the following:
1. Connect a source (for example, an audio player
1
) to LEFT INPUT A and
RIGHT INPUT A.
2. Connect up to 20 mono audio acceptors (for example, mono audio
recorders) to any of the OUTPUT connectors.
3. Release the LEFT and RIGHT selector buttons 1:10/2x1:5 to select 1:10.
4. Connect the power cord to the electricity supply.
5. Switch on the VM-1120.
The audio input(s) is/are distributed to the audio outputs.
Figure 2: 1:20 Mono DA Configuration
1 With 2 identical outputs, or via a 1:2 splitter

KRAMER: SIMPLE CREATIVE TECHNOLOGY
Connecting Your Balanced Stereo Audio Distributor
8
6.2 Connecting a 2x1:10 Mono DA
To configure a 2x1:10 mono DA, as illustrated in Figure 3, do the
following:
1. Connect mono audio source (for example, a mono audio player A)
to LEFT INPUT A.
2. Connect up to 10 mono audio acceptors (for example, mono audio recorders
1A to 10A) to any of the LEFT OUTPUT connectors.
3. Connect mono audio source (for example, a mono audio player B)
to RIGHT INPUT A.
4. Connect up to 10 mono audio acceptors (for example, mono audio recorders
1B to 10B) to any of the RIGHT OUTPUT connectors.
5. Release the LEFT and RIGHT selector buttons 1:10/2x1:5 to select 1:10.
6. Connect the power cord to the electricity supply.
7. Switch on the VM-1120.
The audio input(s) is/are distributed to the audio outputs.
Figure 3: 2x1:10 Mono DA Configuration