Kramer 907xl User manual

KRAMER ELECTRONICS LTD.
USER MANUAL
MODEL:
907xl
Power Amplifier/Mixer
P/N: 2900-300028 Rev 2

907xl – Contents
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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
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)

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
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.
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907xl - Getting Started
3
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/.
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4
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
5
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

6
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
00
01
10
11
Gain
20dB
26dB
32dB
36dB
6. Adjust the output volume by turning the VOLUME potentiometer.
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907xl - Connecting the 907xl Power Amplifier/Mixer
7
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

8
907xl - Technical Specifications
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 CONSUMPTION:
24V DC, 2.2A
CONTROLS:
2 gain DIP-switches, mute button, 2 input level knobs,
1 volume knob
OPERATING TEMPERATURE:
0° to +40°C (32° to 104°F)
STORAGE TEMPERATURE:
-40° to +70°C (-40° to 158°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)
INCLUDED ACCESSORIES:
Power supply
OPTIONS:
RK-1 19” rack mount adapter
Specifications are subject to change without notice at http://www.kramerelectronics.com

For the latest information on our products and a list of Kramer
distributors, visit our Web site where you can find updates to this
user manual.
We welcome your questions, comments, and feedback.
Web site: www.kramerelectronics.com
E-mail: [e-mail]
P/N:
2900-300028
Rev:
2
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SAFETY WARNING
Disconnect the unit from the power
supply before opening and servicing