Kramer 907xl User manual

KRAMER ELECTRONICS LTD.

USER MANUAL

MODEL:

907xl

Power Amplifier/Mixer

P/N: 2900-300028 Rev 2

907xl – 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 907xl Power Amplifier/Mixer 4

4Connecting the 907xl Power Amplifier/Mixer 6

4.1 Connecting the Stereo Audio Inputs 7

5Technical Specifications 8

Figures

Figure 1: 907xl Power Amplifier/Mixer 5

Figure 2: Connecting the 907xl Power Amplifier/Mixer 7

Figure 3: Connecting a Balanced Input to the Balanced Stereo Audio Input 7

Figure 4: Connecting an Unbalanced Input to the Balanced Stereo Audio Input 7

907xl - 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 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 13 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; GROUP 11:

Sierra Video Products; GROUP 12: Digital Signage; and GROUP 13: Audio.

Congratulations on purchasing your Kramer 907xl Power Amplifier/Mixer, 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)

907xl - 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/support/product_downloads.asp

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 907xl 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.

907xl - 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/.

907xl - Overview

3 Overview

The 907xl is a high−performance power amplifier for line−level stereo audio

signals. It accepts a balanced stereo audio signal on a terminal block connector

and an unbalanced stereo signal on RCA connectors. It delivers 40 watts per

channel into an 8Ω load.

The 907xl features:

High efficiency Class D operation

One volume control knob for each input & mute button

Gain control DIP-switches

Mute and On indicator LEDs

A compact MultiTOOLS® enclosure that allows up to 4 units to be rack

mounted side−by−side in a 1U rack space with the optional RK−1 universal

rack adapter

3.1 Defining the 907xl Power Amplifier/Mixer

This section defines the 907xl.

907xl - Overview

Figure 1: 907xl Power Amplifier/Mixer

Feature

Function

INPUT 1 RCA Connectors

Connect to an unbalanced stereo audio source

INPUT 2 Terminal Block

Connector

Connect to a balanced stereo audio source

OUTPUT Terminal Block

Connector

Connect to a balanced stereo acceptor (speakers)

GAIN DIP-switches

4-position switch for setting the basic gain level

24V DC Connector

+24V DC for powering the unit

MUTE Pushbutton

Press to disable/enable the audio output

INPUT 1 LEVEL Knob

Turn to raise or lower the input 1 volume

INPUT 2 LEVEL Knob

Turn to raise or lower the input 2 volume

VOLUME Knob

Turn to raise or lower the output volume

MUTE LED

Lights yellow when the volume is disabled

ON LED

Lights green when receiving power

907xl - Connecting the 907xl Power Amplifier/Mixer

4 Connecting the 907xl Power Amplifier/Mixer

To connect the 907xl as illustrated in the example in Figure 2:

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

907xl. After connecting your 907xl, connect its power and then switch

on the power to each device.

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

player) to the INPUT 1 RCA connectors.

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

player) to the INPUT 2 terminal block connector.

3. Connect the OUTPUT terminal block connectors to the acceptors (a pair of

speakers).

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 necessary adjust the basic volume level by setting the GAIN DIP-switches

as shown here.

DIP-Switch Gain Levels

Switch

Setting

Gain

20dB

26dB

32dB

36dB

6. Adjust the output volume by turning the VOLUME potentiometer.

907xl - Connecting the 907xl Power Amplifier/Mixer

Figure 2: Connecting the 907xl Power Amplifier/Mixer

4.1 Connecting the Stereo Audio Inputs

The 907xl has both unbalanced and balanced stereo audio input connectors.

Figure 3 and Figure 4 illustrate how to wire a balanced/unbalanced to the

balanced audio input connection:

Figure 3: Connecting a

Balanced Input to the Balanced

Stereo Audio Input

Figure 4: Connecting an

Unbalanced Input to the

Balanced Stereo Audio Input

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