Kramer VM-50AN User manual

Kramer Electronics, Ltd.
USER MANUAL
Model:
VM-50AN
1:5 Audio Distributor

Contents
i
Contents
1Introduction 1
2Getting Started 1
3Overview 2
4Your Audio Distributor 2
5Using Your VM-50AN 1:5 Audio Distributor 3
5.1 Connecting Your VM-50AN Balanced Stereo 1:5 Audio Distributor 4
5.2 Connecting Your VM-50AN Unbalanced Stereo 1:5 Audio Distributor 5
5.3 Connecting YourVM-50AN 1:10 Audio Distributor 6
6Technical Specifications 7
Figures
Figure 1: VM-50AN 1:5 Audio Distributor 3
Figure 2: Connecting the VM-50AN as a Balanced Stereo 1:5 Audio Distributor 4
Figure 3: Connecting the VM-50AN as an Unbalanced Stereo 1:5 Audio Distributor 5
Figure 4: Connecting the VM-50AN as a 1:10 Audio Distributor 6
Tables
Table 1: Front Panel VM-50AN 1:5 Audio Distributor Features 3
Table 2: Rear Panel VM-50AN 1:5 Audio Distributor Features 3
Table 3: Technical Specifications of the VM-50AN 1:5 Audio Distributor 7

Introduction
1
1 Introduction
Welcome to Kramer Electronics (since 1981): a world of unique, creative and
affordable solutions to the infinite range of problems that confront the video,
audio and presentation professional on a daily basis. In recent years, we have
redesigned and upgraded most of our line, making the best even better! Our
350-plus different models now appear in 8 Groups1, which are clearly defined
by function.
Congratulations on purchasing your Kramer VM-50AN 1:5 Audio
Distributor, which is ideal for the following typical applications:
• Video/Audio duplication studios and retail outlets
• Any audio system requiring multiple outputs from a single source
The package includes the following items:
• VM-50AN 1:5 Audio Distributor
• Power adapter2
• This user manual3
• Kramer concise product catalog/CD
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 cables4
1 GROUP 1: Distribution Amplifiers; GROUP 2: Video and Audio Switchers, Matrix Switchers and Controllers; GROUP 3:
Video, Audio, VGA/XGA Processors; GROUP 4: Interfaces and Sync Processors; GROUP 5: Twisted Pair Interfaces;
GROUP 6: Accessories and Rack Adapters; GROUP 7: Scan Converters and Scalers; and GROUP 8: Cables and Connectors
2 The 12VDC power supply is included for typical operation. The machine internally raises the input supply voltage to +/-
15Volts, thus enabling full broadcast audio levels
3 Download up-to-date Kramer user manuals from the Internet at this URL: http://www.kramerelectronics.com/manuals.html
4 The complete list of Kramer cables is on our Web site at http://www.kramerelectronics.com (click “Cables and Connectors”
in the Products section)

KRAMER: SIMPLE CREATIVE TECHNOLOGY
Overview
2
3 Overview
The VM-50AN 1:5 Audio Distributor is a unique, high quality 1:5 (1:10)
distribution amplifier for stereo audio signals that can function as one of the
following:
• 1:5 balanced stereo audio DA
• 1:5 unbalanced stereo audio DA
• 1:10 distribution amplifier
In particular, the VM-50AN:
• Accepts an unbalanced or a balanced stereo input, letting you select the
input type via a front panel button
• Always has 10 stereo output channels available, of which five are
unbalanced (on mini 3.5mm audio sockets), and five are balanced (on
detachable snap-fit terminal block connectors). All output channels can be
used simultaneously
• Has front panel right/left signal level trimmer controls
• Operates stand-alone, or is the perfect companion to other Kramer “50”
series products like the VM-50V video DA, or the VM-50YC s-Video DA
• Is rugged and dependable, and is housed in a convenient desktop sized
enclosure which can also be rack mounted using the RK-50RN kit which
holds two units in two vertical spaces of a standard 19" rack
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 and
positioning your VM-50AN away from excessive sunlight, moisture and dust
4 Your Audio Distributor
Figure 1 illustrates the front and rear panels of the VM-50AN. Tables 1 and 2
define the front and rear panels of the VM-50AN, respectively.

Using Your VM-50AN 1:5 Audio Distributor
3
Figure 1: VM-50AN 1:5 Audio Distributor
Table 1: Front Panel VM-50AN 1:5 Audio Distributor Features
# Feature Function
1 POWER Switch Illuminated switch supplying power to the unit
2 BAL/UNBAL INPUT
MODE Button Selects balanced stereo audio when released; selects unbalanced stereo audio when pushed in
3 Right LEVEL Trimmer Adjusts1the right output signal level
4 Left LEVEL Trimmer Adjusts1the left output signal level
Table 2: Rear Panel VM-50AN 1:5 Audio Distributor Features
# Feature Function
1 INPUT Mini 3.5 mm Socket Connects to the unbalanced audio source
2 INPUT Terminal Block Connector Connects to the balanced audio source
3 OUT Mini 3.5 mm Socket Connects to the unbalanced audio acceptors (from 1 to 5)
4 OUT Terminal Block Connector Connects to the balanced audio acceptors (from 1 to 5)
5 12 VDC +12V DC connector for powering the unit
5 Using Your VM-50AN 1:5 Audio Distributor
This section describes how to connect the VM-50AN as:
• A balanced stereo 1:5 audio distributor, see section 5.1
• An unbalanced stereo 1:5 audio distributor, see section 5.2
• A 1:10 audio distributor, see section 5.3
1 Insert a screwdriver into the small hole and carefully rotate it, trimming the appropriate OUTPUT level

KRAMER: SIMPLE CREATIVE TECHNOLOGY
Using Your VM-50AN 1:5 Audio Distributor
4
5.1 Connecting Your VM-50AN Balanced Stereo 1:5 Audio Distributor
To connect and operate the VM-50AN as a balanced stereo 1:5 audio
distributor, as the example in Figure 2 illustrates, do the following1:
1. Connect the balanced stereo audio source to the INPUT terminal block
connector.
2. Connect up to five balanced stereo audio acceptors to the OUT terminal
block connectors. Outputs may be connected or left unconnected.
3. Connect the 12V DC power adapter to the power socket, connect the
adapter to the mains electricity, and then turn on the power switch.
4. Release the BAL/UNBAL INPUT MODE button to select balanced stereo
audio operation.
5. Adjust2the right and/or left output signal level, if required.
Figure 2: Connecting the VM-50AN as a Balanced Stereo 1:5 Audio Distributor
1 Switch OFF the power on each device before connecting it to your VM-50AN. After connecting your VM-50AN, switch on
its power and then switch on the power on each device
2 Insert a screwdriver into the hole and carefully rotate it, to trim the level

Using Your VM-50AN 1:5 Audio Distributor
5
5.2 Connecting Your VM-50AN Unbalanced Stereo 1:5 Audio Distributor
To connect the VM-50AN as an unbalanced stereo 1:5 audio distributor, as
the example in Figure 3 illustrates, do the following1:
1. Connect the unbalanced stereo audio source (for example, a PC sound
card) to the INPUT mini 3.5mm socket.
2. Connect up to five unbalanced stereo audio acceptors to the OUT mini
3.5mm sockets. Outputs may be connected or left unconnected.
3. Connect the 12V DC power adapter to the power socket, connect the
adapter to the mains electricity, and then turn on the power switch.
4. Push in the BAL/UNBAL INPUT MODE button to select unbalanced
stereo audio operation.
5. Adjust2the right and/or left output signal level, if required.
Figure 3: Connecting the VM-50AN as an Unbalanced Stereo 1:5 Audio Distributor
1 Switch OFF the power on each device before connecting it to your VM-50AN. After connecting your VM-50AN, switch on
its power and then switch on the power on each device
2 Insert a screwdriver into the hole and carefully rotate it, to trim the level

KRAMER: SIMPLE CREATIVE TECHNOLOGY
Using Your VM-50AN 1:5 Audio Distributor
6
5.3 Connecting Your VM-50AN 1:10 Audio Distributor
To connect the VM-50AN as a 1:10 audio distributor, as the example in
Figure 4 illustrates, do the following1:
1. Connect either (but not both simultaneously2) the:
• Balanced stereo audio source to the INPUT terminal block connector (and
release the BAL/UNBAL INPUT MODE button to select balanced stereo
audio operation), or
• Unbalanced stereo audio source to the INPUT mini 3.5mm socket (and
push in the BAL/UNBAL INPUT MODE button to select unbalanced stereo
audio operation)
2. Connect up to310 acceptors, as follows:
• 5 balanced stereo audio acceptors to the OUT terminal block connectors, and
• 5 unbalanced stereo audio acceptors to the OUT mini 3.5mm sockets
3. Connect the 12V DC power adapter to the power socket, connect the
adapter to the mains electricity, and then turn on the power switch.
4. Adjust4the right and/or left output signal level, if required.
Figure 4: Connecting the VM-50AN as a 1:10 Audio Distributor
1 Switch OFF the power on each device before connecting it to your VM-50AN. After connecting your VM-50AN, switch on
its power and then switch on the power on each device
2 Both formats cannot be connected to the machine at the same time, as they share some of the input connections
3 Outputs may be connected or left unconnected
4 Insert a screwdriver into the hole and carefully rotate it, to trim the level

Technical Specifications
7
6 Technical Specifications
Table 3 includes the technical specifications.
Table 3: Technical Specifications1of the VM-50AN 1:5 Audio Distributor
INPUTS: 1 balanced stereo +12dBm 50kΩon detachable terminal block connector
1 unbalanced stereo on mini 3.5 mm socket
OUTPUTS: 5 balanced stereo +22dBm 50Ωon detachable terminal block connectors
5 unbalanced stereo +22dBm 70Ωon mini 3.5 mm sockets
MAX. OUTPUT LEVEL: 28Vpp
BANDWIDTH: –3dB@>100kHz; –0.1dB@40kHz; Fully Loaded
S/N RATIO: 83.95dB, unweighted
CONTROLS: Level (for right and left): 0.4 to 9.5dB
COUPLING: Input: AC; Output: DC
AUDIO THD + NOISE: 0.022% @ 1 kHz, Balanced Output
AUDIO 2nd HARMONIC:
0.002% @ 1 kHz, Balanced Output
POWER SOURCE: 12VDC 200mA
DIMENSIONS: 16.5cm x 12cm x 4.5cm (6.5” x 4.7” x 1.7”, W, D, H)
WEIGHT: 0.6kg (1.3lbs.) approx.
ACCESSORIES: 12 VDC power supply
OPTIONS: 19" rack adapter RK-50RN kit (holds 2 units in a vertical space of a standard
19” rack)
1 Specifications are subject to change without notice

KRAMER: SIMPLE CREATIVE TECHNOLOGY
8
LIMITED WARRANTY
Kramer Electronics (hereafter Kramer) warrants this product free from defects in material and workmanship under the
following terms.
HOW LONG IS THE WARRANTY
Labor and parts are warranted for three years from the date of the first customer purchase.
WHO IS PROTECTED?
Only the first purchase customer may enforce this warranty.
WHAT IS COVERED AND WHAT IS NOT COVERED
Except as below, this warranty covers all defects in material or workmanship in this product. The following are not covered
by the warranty:
1. Any product which is not distributed by Kramer, or which is not purchased from an authorized Kramer dealer. If you are
uncertain as to whether a dealer is authorized, please contact Kramer at one of the agents listed in the web site
www.kramerelectronics.com.
2. Any product, on which the serial number has been defaced, modified or removed.
3. Damage, deterioration or malfunction resulting from:
i) Accident, misuse, abuse, neglect, fire, water, lightning or other acts of nature
ii) Product modification, or failure to follow instructions supplied with the product
iii) Repair or attempted repair by anyone not authorized by Kramer
iv) Any shipment of the product (claims must be presented to the carrier)
v) Removal or installation of the product
vi) Any other cause, which does not relate to a product defect
vii) Cartons, equipment enclosures, cables or accessories used in conjunction with the product
WHAT WE WILL PAY FOR AND WHAT WE WILL NOT PAY FOR
We will pay labor and material expenses for covered items. We will not pay for the following:
1. Removal or installations charges.
2. Costs of initial technical adjustments (set-up), including adjustment of user controls or programming. These costs are the
responsibility of the Kramer dealer from whom the product was purchased.
3. Shipping charges.
HOW YOU CAN GET WARRANTY SERVICE
1. To obtain service on you product, you must take or ship it prepaid to any authorized Kramer service center.
2. Whenever warranty service is required, the original dated invoice (or a copy) must be presented as proof of warranty coverage,
and should be included in any shipment of the product. Please also include in any mailing a contact name, company, address, and
a description of the problem(s).
3. For the name of the nearest Kramer authorized service center, consult your authorized dealer.
LIMITATION OF IMPLIED WARRANTIES
All implied warranties, including warranties of merchantability and fitness for a particular purpose, are limited in duration to
the length of this warranty.
EXCLUSION OF DAMAGES
The liability of Kramer for any effective products is limited to the repair or replacement of the product at our option. Kramer
shall not be liable for:
1. Damage to other property caused by defects in this product, damages based upon inconvenience, loss of use of the product, loss
of time, commercial loss; or:
2. Any other damages, whether incidental, consequential or otherwise. Some countries may not allow limitations on how long an
implied warranty lasts and/or do not allow the exclusion or limitation of incidental or consequential damages, so the above
limitations and exclusions may not apply to you.
This warranty gives you specific legal rights, and you may also have other rights, which vary from place to place.
NOTE: All products returned to Kramer for service must have prior approval. This may be obtained from your dealer.
This equipment has been tested to determine compliance with the requirements of:
EN-50081: "Electromagnetic compatibility (EMC);
generic emission standard.
Part 1: Residential, commercial and light industry"
EN-50082: "Electromagnetic compatibility (EMC) generic immunity standard.
Part 1: Residential, commercial and light industry environment".
CFR-47: FCC Rules and Regulations:
Part 15: “Radio frequency devices
Subpart B – Unintentional radiators”
CAUTION!
⌦ Servicing the machines can only be done by an authorized Kramer technician. Any user who makes changes or modifications to
the unit without the expressed approval of the manufacturer will void user authority to operate the equipment.
⌦ Use the supplied DC power supply to feed power to the machine.
⌦ Please use recommended interconnection cables to connect the machine to other components.

Kramer Electronics, Ltd.
3 Am VeOlamo Street. Jerusalem 95463, Israel Tel: [phone]
Fax: [phone], E-mail: [e-mail]
P/N: 2900-000050 REV 1
For the latest information on our products and a list of Kramer
distributors, visit our Web site: www.kramerelectronics.com.
Updates to this user manual may be found at
http://www.kramerelectronics.com/manuals.html.
We welcome your questions, comments and feedback.