Kramer 907xl User manual

KRAMER ELECTRONICS LTD.

USER MANUAL

MODEL:

907xl

Power Amplifier/Mixer

P/N: 2900-300028 Rev 1

907xl – Contents i

Contents

1Introduction 1

2Getting Started 2

2.1Achieving the Best Performance 2

3Overview 3

3.1Defining the 907xl Power Amplifier/Mixer 3

4Connecting the 907xl Power Amplifier/Mixer 5

4.1Connecting the Stereo Audio Input 6

5Technical Specifications 7

Figures

Figure 1: 907xl Power Amplifier/Mixer 4

Figure 2: Connecting the 907xl Power Amplifier/Mixer 6

Figure 3: Connecting the Balanced Stereo Audio Input 6

Figure 4: Connecting the Unbalanced Stereo Audio Input 6

907xl - 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 that are clearly defined

by function: 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 and

GROUP 11: Sierra Products.

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)

2 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

Use Kramer high performance high resolution cables

Use only the power cord that is supplied with this machine

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).

Caution: 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

2.1 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)

•Avoid interference from neighboring electrical appliances that may adversely

influence signal quality

•Position your Kramer 907xl away from moisture, excessive sunlight and dust

907xl - Overview 3

3 Overview

The Kramer MultiTOOLS™ 907xl is a high-performance, 40W RMS per channel,

Class D power amplifier/mixer for line-level stereo audio signals. It accepts a

balanced stereo audio signal on a terminal block connector. It delivers 150 watts

per channel of music output to the speakers.

The 907xl features:

•One unbalanced stereo audio input on RCA connectors

•One balanced stereo audio input on a terminal block connector

•Input volume adjustment for each input for mixing capability

•One speaker output on a terminal block connector

•Gain control DIP-switches

•A mute button

•24V DC power

3.1 Defining the 907xl Power Amplifier/Mixer

This section defines the 907xl.

4 907xl - Overview

Figure 1: 907xl Power Amplifier/Mixer

# Feature Function

1 INPUT 1 RCA Connectors Connect to an unbalanced stereo audio source

2 INPUT 2 Terminal Block

Connector

Connect to a balanced stereo audio source

3 OUTPUT Terminal Block

Connector

Connect to a balanced stereo acceptor (speakers)

4 GAIN DIP-switches 4-position switch for setting the basic gain level

5 24V DC Connector +24V DC for powering the unit

6 MUTE Pushbutton Press to disable/enable the audio output

7 INPUT 1 LEVEL Knob Turn to raise or lower the input 1 volume

8 INPUT 2 LEVEL Knob Turn to raise or lower the input 2 volume

9 VOLUME Knob Turn to raise or lower the output volume

10 MUTE LED Lights yellow when the volume is disabled

11 ON LED Lights green when receiving power

907xl - Connecting the 907xl Power Amplifier/Mixer 5

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 00 01 10 11

Gain 20dB 26dB 32dB 36dB

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

6 907xl - Connecting the 907xl Power Amplifier/Mixer

Figure 2: Connecting the 907xl Power Amplifier/Mixer

4.1 Connecting the Stereo Audio Input

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

connection:

Figure 3: Connecting the

Balanced Stereo Audio Input

Figure 4: Connecting the

Unbalanced Stereo Audio Input

907xl - Technical Specifications 7

5 Technical Specifications

INPUT: 1 balanced stereo audio on a terminal block connector,

1 unbalanced stereo audio on RCA connectors

OUTPUT: Speaker output on a terminal block connector

OUTPUT POWER: 40W per channel into 8Ω

OUTPUT MUSIC POWER: 150W per channel into 8Ω

INPUT SENSITIVITY: 1.2Vrms

AMPLIFIER TYPE: Class D

VOLTAGE GAIN: 36dB (x10)

BANDWIDTH (-3dB): 25kHz

S/N RATIO: 66dB

COUPLING: Inputs: AC, Outputs: DC

AUDIO THD + NOISE: 1.2%

AUDIO 2nd HARMONIC: 1%

POWER SOURCE: 24V DC, 2A

CONTROLS: 2 gain DIP-switches, mute button, 2 input level knobs, 1

volume knob

OPERATING TEMPERATURE: 0° to +55°C (32° to 131°F)

STORAGE TEMPERATURE: -45° to +72°C (-49° to 162°F)

HUMIDITY: 10% to 90%, RHL non-condensing

DIMENSIONS 10.7cm x 10.4cm x 4.0cm (4.2" x 4.1" x 1.6") W, D, H

WEIGHT: 0.32kg (0.7lbs)

ACCESSORIES: Power supply

OPTIONS: RK-1 19” rack mount adapter

Specifications are subject to change without notice at http://www.kramerelectronics.com

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