Kramer VA-4 Manuale utente

KRAMER ELECTRONICS LTD.

USER MANUAL

MODEL:

VA-4

Dual Channel Balanced Stereo

Audio Amplifier

P/N: 2900-000004 Rev 2A

VA-4 – Contents i

Contents

1Introduction 1

2Getting Started 2

2.1 Achieving the Best Performance 2

2.2 Safety Instructions 2

2.3 Recycling Kramer Products 3

3Overview 4

3.1 Defining the VA-4 Dual Channel Balanced Stereo Audio Amplifier 4

4Connecting the VA-4 7

4.1 Connecting to the VA-4 via RS-232 8

5Technical Specifications 10

6Protocol 2000 11

Figures

UFigure 1: VA-4 Dual Channel Balanced Stereo Audio Amplifier Front PanelU5

UFigure 2: VA-4 Dual Channel Balanced Stereo Audio Amplifier Rear PanelU6

UFigure 3: Connecting the VA-4 Dual Channel Balanced Stereo Audio AmplifierU8

UFigure 4: Crossed Cable RS-232 ConnectionU9

UFigure 5: Straight Cable RS-232 Connection with a Null Modem AdapterU9

VA-4 - 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 video, audio, presentation, and broadcasting professionals

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 that are clearly defined

by function: GROUP 1: Distribution Amplifiers; GROUP 2: Switchers and Routers;

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 and GROUP 11:

Sierra Products.

Congratulations on purchasing your Kramer VA-4 Dual Channel Balanced Stereo

Audio Amplifier, which is ideal for the following typical applications:

•Presentation audio level control

•Recording studios and broadcast studios for on-line signal distribution

2 VA-4 - Getting Started

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

Go to http://www.kramerelectronics.com to check for up-to-date user

manuals, application programs, and to check if firmware upgrades are

available (where appropriate).

2.1 Achieving the Best Performance

To achieve the best performance:

•Use only good quality connection cables to avoid interference, deterioration

in signal quality due to poor matching, and elevated noise levels (often

associated with low quality cables)

•Do not secure the cables in tight bundles or roll the slack into tight coils

•Avoid interference from neighboring electrical appliances that may adversely

influence signal quality

•Position your Kramer VA-4 away from moisture, excessive sunlight and dust

This equipment is to be used only inside a building. It may only be

connected to other equipment that is installed inside a building.

2.2 Safety Instructions

Caution: No operator serviceable parts inside the unit

Warning: You use only the power cord that is supplied with the

unit. Do not open the unit. High voltages can cause

electrical shock! Servicing by qualified personnel only.

Warning: Disconnect the power and unplug the unit from the wall

before installing

VA-4 - Getting Started 3

2.3 Recycling Kramer Products

The Waste Electrical and Electronic Equipment (WEEE) Directive 2002/96/EC

aims to reduce the amount of WEEE sent for disposal to landfill or incineration by

requiring it to be collected and recycled. To comply with the WEEE Directive,

Kramer Electronics has made arrangements with the European Advanced

Recycling Network (EARN) and will cover any costs of treatment, recycling and

recovery of waste Kramer Electronics branded equipment on arrival at the EARN

facility. For details of Kramer’s recycling arrangements in your particular country

go to our recycling pages at http://www.kramerelectronics.com/support/recycling/.

4 VA-4 - Overview

3 Overview

The VA−4 is a volume controller for two channels of balanced stereo audio signals

on XLR connectors. The volume of each stereo channel can be adjusted

independently of the other stereo channel.

The VA-4:

•Features a digitally controlled volume control function

•Uses high quality low distortion audio components, enabling transparent

processing of the audio signals

•Lets you control the audio gain of each channel via the front panel or via

RS-232

•Includes a bright 7-segment LED display on the front panel, showing the

current gain or attenuation setting

•Stores settings in the non-volatile memory upon shut down

3.1 Defining the VA-4 Dual Channel Balanced Stereo Audio

Amplifier

This section defines the VA-4.

VA-4 - Overview 5

VA-4 – Overview 5

Figure 1: VA-4 Dual Channel Balanced Stereo Audio Amplifier Front Panel

# Feature Function

1 POWER Switch Illuminated switch supplying power to the unit

2 - Button Press to decrease the level

3 + Button Press to increase the level

4 LEVEL 7-segment LED Display Shows the gain of the selected channel (in decibels)

5 SELECT Button Selects the stereo channel (1 or 2) being controlled using the + button and the - button

6 Channel 1 LED Illuminates when channel 1 is chosen via the SELECT button

7 Channel 2 LED Illuminates when channel 2 is chosen via the SELECT button

6 VA-4 - Overview

Figure 2: VA-4 Dual Channel Balanced Stereo Audio Amplifier Rear Panel

Feature

Function

8 CH.1 IN LEFT and RIGHT XLR Female Connectors Connects to the balanced stereo audio source 1

9 CH.2 IN LEFT and RIGHT XLR Female Connectors Connects to the balanced stereo audio source 2

10 CH.1 OUT LEFT and RIGHT XLR Male Connectors Connects to the balanced stereo audio acceptor 1

11 CH.2 OUT LEFT and RIGHT XLR Male Connectors Connects to the balanced stereo audio acceptor 2

12 RS-232 9-pin D-sub Port Connects to the PC or the Remote Controller

13 Power Connector with FUSE AC connector enabling power supply to the unit

6VA-4 – Overview

VA-4 - Connecting the VA-4 7

4 Connecting the VA-4

Always switch off the power to each device before connecting it to your

VA-4. After connecting your VA-4, connect its power and then switch

on the power to each device.

To connect the VA-4 as illustrated in the example in Figure 3:

1. Connect a balanced stereo audio source (for example, a set top box: source

1) to the left and right channel 1 IN XLR connectors.

2. Connect a balanced stereo audio source (Source 2) to the left and right

channel 2 IN XLR connectors.

3. Connect the left and right channel 1 OUT XLR connectors to a balanced

stereo audio acceptor (Acceptor 1).

4. Connect the left and right channel 2 OUT XLR connectors to a balanced

stereo audio acceptor (Acceptor 2).

5. Connect a PC (or other control device) to the RS-232 9-pn D-sub port, if

control via RS-232 is required (see Section 4.1

6. Connect the power cord to the mains electricity (not shown in

Figure 3).

7. Select the stereo channel (1 or 2) by pressing the SELECT button, and set

the level using the + and – buttons (as required).

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