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
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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.
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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