Kramer 908 Bedienungsanleitung

KRAMER ELECTRONICS LTD.

USER MANUAL

MODEL:

908

40W per Channel Stereo Audio

Amplifier

P/N: 2900-000537 Rev 6

908 – Contents

Contents

1Introduction 1

2Getting Started 2

2.1 Achieving the Best Performance 2

2.2 Safety Instructions 3

2.3 Recycling Kramer Products 3

3Overview 4

3.1 Defining the 908 40W per Channel Stereo Audio Amplifier 5

4Connecting the 908 7

4.1 Connecting Balanced/Unbalanced Stereo Audio Input/Output 8

4.2 Connect the 10V CONTROL Port to an External Controller 9

4.3 Connecting a PC via RS-232 9

4.4 Connecting the 908 via the Ethernet Port 10

5Operating the 908 12

5.1 Using the Front Panel Buttons 12

5.2 Using Serial Commands 13

5.3 Using the Embedded Web Server 13

5.4 Using the RC-IR3 Infrared Remote Controller 17

6Updating the 908 Firmware 18

7Default Communication Parameters 19

8Technical Specifications 20

9908 Commands in Protocol 3000 21

9.1 Operating Commands 21

9.2 Help Commands 21

9.3 Device Initiated Messages 21

9.4 Result and Error Codes 21

9.5 Basic Routing Commands 22

9.6 Audio Parameters Commands 22

9.7 Identification Commands 23

9.8 Network Setting Commands 24

9.9 Machine Information Commands 24

9.10 Protocol 3000 Syntax 25

Figures

Figure 1: 908 40W per Channel Stereo Audio Amplifier 5

Figure 2: Connecting the 908 40W per Channel Stereo Audio Amplifier 8

Figure 3: Balanced Stereo Audio Connection 8

Figure 4: Unbalanced Stereo Audio Input Connection 8

Figure 5: Unbalanced Stereo Audio Output Connection 8

Figure 6: Connecting the 10V VOL Terminal Block Connector 9

Figure 7: Connecting to a PC 9

Figure 8: Local Area Properties Window 10

Figure 9: Internet Protocol (TCP/IP) Properties Window 11

Figure 10: Java Test Page Success Message 13

Figure 11: Entering the IP Number in the Address Bar 14

Figure 12: Loading the Embedded Web Server 14

Figure 13: First Time Security Warning 15

Figure 14: The 908 Control Window 15

Figure 15: Control Settings 16

Figure 16: Ethernet Settings 16

908 - Introduction

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 908 40W per Channel Stereo Audio

Amplifier, which is ideal for the following typical applications:

Presentation rooms and multimedia applications for quick, local audio

amplification

Personal audio listening (for example, a PC and portable CD player)

908 - 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

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 (we recommend Kramer high-

performance, high-resolution 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 908 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.

908 - Getting Started

2.2 Safety Instructions

Caution:

There are no operator serviceable parts inside the unit

Warning:

Use only the Kramer Electronics input power wall

adapter that is provided with the unit

Warning:

Disconnect the power and unplug the unit from the wall

before installing

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/.

908 - Overview

3 Overview

The Kramer 908 is a high-performance audio amplifier for line-level stereo audio

signals. It accepts either a stereo audio signal on RCA connectors or a balanced

stereo audio signal on a terminal block connector. It delivers a speaker output of

2x40 watts RMS per channel into an 8load on a 10A 4-pin terminal block

connector. The 908 features:

Two input selector buttons and a mute button

One gain knob for adjusting the audio output levels for loudness, bass,

middle, treble, balance and the volume

A USB connector for firmware upgrade

RS-232 and Ethernet ports

A 10V control port for adjusting the audio gain via an external connector (for

example, the Kramer RC-63A)

The 908 can be controlled:

Directly, via the front panel push buttons and adjustment knob

By RS-232 serial commands transmitted by a touch screen system, PC, or

other serial controller

Via an external 10V controller (for volume)

Via the Ethernet using the embedded Web server

Remotely, from the infrared remote control transmitter

The 908 is housed in a Kramer MegaTOOLS™ enclosure and is fed by a 24V DC

power supply.

908 - Overview

3.1 Defining the 908 40W per Channel Stereo Audio

Amplifier

This section defines the 908.

Figure 1: 908 40W per Channel Stereo Audio Amplifier

Feature

Function

INPUT 1 L and R RCA Connectors

Connect to the left and right unbalanced stereo

analog audio acceptor

INPUT 2 Terminal Block Connector

Connect to the balanced stereo audio source

OUTPUT Terminal Block

Connector

Connect to a balanced stereo acceptor (speakers)

10V VOL G, V, + Terminal Block

Connector

Connect to a controller (for example, the Kramer

RC-63A) to adjust the volume via the controller

RS-232 G Tx Rx Terminal Block

Connector

Control connector

ETHERNET Port

Connects to your LAN

FACTORY RESET Button

Press to return the device to its factory default

settings

PROGRAM Switch

Switch down before performing a firmware

upgrade, leave up (the default) for normal

operation

24V DC Connector

+24V DC for powering the unit

IR IN Receiver

Accepts IR remote commands

ON LED

Illuminates green when receiving power, flashes

when receiving IR commands

MUTE Button

Press to disable/enable the audio output. The

button illuminates when the audio output is

disabled

INPUT SELECTOR Buttons

Press to select the input audio source 1 or 2

908 - Overview

Feature

Function

LOUDNESS Button

Press to select the loudness adjustment, adjust

with the level knob

BASS Button

Press to select the bass adjustment, adjust with

the level knob

MID Button

Press to select the mid- range adjustment, adjust

with the level knob

TREBLE Button

Press to select the treble adjustment, adjust with

the level knob

BALANCE Button

Press to select the balance between right and left

speakers, adjust with the level knob

VOLUME Button

Press to select the volume adjustment, adjust with

the level knob

Level Adjustment Knob

Increase and decrease the level of the previously

selected function. Press and hold to disable local

volume control and enable remote volume control.

Press and hold again to activate local volume

control (see Section 5.1)

PROGRAM (USB) Connector

Connect to a computer to upgrade the firmware

908 - Connecting the 908

4 Connecting the 908

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

908. After connecting your 908, connect its power and then switch on

the power to each device.

To connect the 908, as illustrated in the example in Figure 2, (see the input/output

connections in Section 4.1) do the following:

1. Connect an unbalanced stereo audio source (for example, the unbalanced

stereo audio output of a DVD player) to the L and R INPUT 1 RCA

connectors.

2. Connect a balanced stereo audio source (for example, the balanced stereo

audio output of a DVD player) to the INPUT 2 terminal block connector.

3. Connect the OUTPUT terminal block to a pair of loudspeakers:

Connect the “L+” and the “L-” terminal block connectors to the left

loudspeaker, and the “R+” and the “R-” terminal block connectors to the right

loudspeaker. Do not ground the loudspeakers.

4. Connect the 24V DC power adapter to the power socket and connect the

adapter to the mains electricity (not shown in Figure 2).

5. If required, connect:

The 10V CONTROL terminal block connector to an external controller

(for example, the Kramer RC-63A) (see Section 4.2)

The RS-232 port to a PC and/or serial controller (see Section 4.3)

The Ethernet port to a PC or a network hub or router (see Section 4.4)

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