Kramer Electronics, Ltd.
Preliminary
USER MANUAL
Model:
907
Power Amplifier
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
defined by function.
Thank you for purchasing the Kramer MultiTOOLS® 907 Power Amplifier,
which is ideal for:
•
Presentation rooms and multimedia applications for quick, local
audio amplification
•
Personal audio listening (for example, a PC and portable CD
player)
Each package includes the following items:
•
•
•
The 907 Power Amplifier
Power adapter (24V DC input)
This user manual2
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 cables3
1
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; GROUP 11: Sierra Products
1
Overview
3
Overview
The Kramer MultiTOOLS™ 907 is a high-performance Class D power
amplifier 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 907 features:
•
•
•
•
•
Input and output on terminal block connections
A volume control knob
Gain control DIP-switches
A mute button
24V DC power
To achieve the best performance:
•
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 and position your Kramer
907 away from moisture, excessive sunlight and dust
Caution – No operator-serviceable parts inside unit.
Warning – Use only the Kramer Electronics input power
Warning – Disconnect power and unplug unit from wall
before installing or removing device or servicing unit.
2 For example, part number 2535-000245
3
Your 907 Power Amplifier
4
Your 907 Power Amplifier
Figure 1: 907 Power Amplifier Functions
Table 1: 907 Power Amplifier Functions
#
Feature
INPUT Terminal Block Connector
Function
1
2
3
4
5
6
7
8
Connect to a balanced stereo audio source
OUTPUT Terminal Block Connector Connect to a balanced stereo acceptor (speakers)
GAIN DIP-switches
24V DC Connector
MUTE Pushbutton
VOLUME Potentiometer Knob
MUTE LED
4-position switch for setting the basic gain level
+24V DC for powering the unit
Press to disable/enable the audio output
Turn to raise or lower the output volume
Illuminates yellow when the volume is disabled
Illuminates green when receiving power
ON LED
KRAMER: SIMPLE CREATIVE TECHNOLOGY
4
Connecting the 907 Power Amplifier
5
Connecting the 907 Power Amplifier
1. Connect the balanced stereo audio source (for example, a stereo audio
player) to the INPUT terminal block connector.
2. Connect the OUTPUT terminal block connectors to the acceptors (a pair of
speakers). Do not ground the loudspeakers.
3. Connect the 24V DC power adapter to the power socket and connect the
adapter to the mains electricity.
4. If necessary adjust the basic volume level by setting the GAIN DIP-
5. Adjust the output volume by turning the VOLUME potentiometer.
Table 2: DIP-switch Gain Levels
Switch
Setting
Gain
00
01
10
11
20dB
26dB
32dB
36dB
5.1 Connecting the Stereo Audio Input
connection:
Figure 2: Connecting the
Balanced Stereo Audio
Input/Output
Figure 3: Connecting the
Unbalanced Stereo Audio
Input
1 Switch OFF the power on each device before connecting it to your 907. After connecting your 907, switch on its power and
then switch on the power on each device
5
Technical Specifications
Figure 4: Connecting the 907 Power Amplifier
6
Technical Specifications
Table 3: 907 Technical Specifications1
INPUT:
Balanced stereo audio on a terminal block connector
OUTPUT:
Balanced stereo audio (speakers) on a terminal block connector
OUTPUT POWER:
40W per channel into 8Ω
OUTPUT MUSIC POWER: 150W per channel into 8Ω
INPUT SENSITIVITY:
AMPLIFIER TYPE:
VOLTAGE GAIN:
BANDWIDTH (-3dB):
S/N RATIO:
1.2Vrms
Class D
20dB (x10)
20kHz
60.2dB
COUPLING:
DC
AUDIO THD + NOISE:
AUDIO 2nd HARMONIC:
POWER SOURCE:
DIMENSIONS
1.9%
0.3%
24V DC, 5A
10.7cm x 10.4cm x 4.0cm (4.2" x 4.1" x 1.6") W, D, H
0.32kg (0.7lbs)
WEIGHT:
ACCESSORIES:
OPTIONS:
Power supply
RK-1 19” rack mount adapter
1 Specifications are subject to change without notice
KRAMER: SIMPLE CREATIVE TECHNOLOGY
6
LIMITED WARRANTY
Kramer Electronics (hereafter Kramer) warrants this product free from defects in material and workmanship under the
following terms.
HOW LONGIS THE WARRANTY
Labor and parts are warranted for seven years from the date of the first customer purchase.
WHO IS PROTECTED?
Only the first purchase customer may enforce this warranty.
WHAT IS COVERED AND WHAT IS NOT COVERED
Except as below, this warranty covers all defects in material or workmanship in this product. The following are not covered
by thewarranty:
1. Any product which is not distributed by Kramer, or which is not purchased from an authorized Kramer dealer. If you are
uncertain as to whether a dealer is authorized, please contact Kramer at one of the agents listed in the Web site
2. Any product, on which the serial number has been defaced, modified or removed, or on which the WARRANTY VOID
IF TAMPERED sticker has been torn, reattached, removed or otherwise interfered with.
3. Damage, deterioration ormalfunctionresultingfrom:
i) Accident, misuse, abuse, neglect, fire, water, lightning orotheractsofnature
ii) Product modification, orfailureto followinstructions supplied with theproduct
iii) Repairorattemptedrepairby anyonenot authorized byKramer
iv) Anyshipment oftheproduct(claims must bepresentedtothe carrier)
v) Removalorinstallationoftheproduct
vi) Anyothercause, whichdoes not relateto aproduct defect
vii) Cartons, equipment enclosures, cables or accessoriesusedinconjunctionwiththeproduct
WHAT WE WILLPAY FOR AND WHAT WE WILLNOT PAY FOR
Wewill pay laborand material expensesforcovered items.Wewill notpayforthefollowing:
1. Removal orinstallationscharges.
2. Costs of initial technical adjustments (set-up), including adjustment of user controls or programming. These costs are the
responsibility oftheKramerdealerfromwhomtheproduct was purchased.
3. Shipping charges.
HOW YOU CAN GET WARRANTY SERVICE
1. To obtain service on you product, you must take or ship it prepaid to any authorized Kramer service center.
2. Whenever warranty service is required, the original dated invoice (or a copy) must be presented as proof of warranty
coverage, and should be included in any shipment of the product. Please also include in any mailing a contact name,
company, address, and a description of the problem(s).
3. For the name of the nearest Kramer authorized service center, consult your authorized dealer.
LIMITATION OFIMPLIED WARRANTIES
All implied warranties, including warranties of merchantability and fitness for a particular purpose, are limited in duration to
the length of this warranty.
EXCLUSION OFDAMAGES
The liability of Kramer for any effective products is limited to the repair or replacement of the product at our option. Kramer shall
not beliable for:
1. Damage to otherproperty caused by defects inthis product, damages basedupon inconvenience, loss ofuseof theproduct, loss
oftime, commercialloss; or:
2. Any other damages, whether incidental, consequential or otherwise. Some countries may not allow limitations on how long an
implied warranty lasts and/or do not allow the exclusion or limitation of incidental or consequential damages, so the above
limitations andexclusions maynot applytoyou.
Thiswarranty gives youspecificlegalrights, andyou may alsohaveotherrights, which varyfromplacetoplace.
NOTE:Allproducts returned to Kramerforservicemust havepriorapproval.Thismay be obtained fromyourdealer.
Thisequipment has been testedtodeterminecompliancewith therequirements of:
EN-50081:
"Electromagneticcompatibility(EMC);
genericemissionstandard.
Part 1: Residential, commercial and lightindustry"
"Electromagneticcompatibility(EMC)genericimmunitystandard.
Part 1: Residential, commercialand lightindustryenvironment".
FCC* Rules and Regulations:
EN-50082:
CFR-47:
Part 15: “Radio frequency devices
Subpart B Unintentional radiators”
CAUTION!
Servicing the machines can only be done by an authorized Kramer technician. Any user who makes changes or
modifications to the unit without the expressed approval of the manufacturer will void user authority to operate the
equipment.
UsethesuppliedDCpowersupply to feed power to themachine.
Pleaseuserecommended interconnection cablestoconnect themachineto other components.
* FCCand CEapproved using STPcable(fortwisted pairproducts)
7
For the latest information on our products and a list of Kramer
where updates to this user manual may be found.
We welcome your questions, comments and feedback.
Safety Warning:
Disconnect the unit from the power supply before
opening/servicing.
Caution
2900- 000523
3
PN:
Rev:
Kramer Electronics, Ltd.
E-mail: [email protected]
P/N: 2900-000523 REV 3
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