Kramer Electronics Stereo Amplifier 907 User Manual

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  
1,000-plus different models now appear in 11 groups1 that are clearly  
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  
2 Download up-to-date Kramer user manuals from our Web site at http://www.kramerelectronics.com  
3 The complete list of Kramer cables is on our Web site at http://www.kramerelectronics.com  
1
 
         
Getting Started  
2.1 Quick Start  
This quick start chart summarizes the basic setup and operation steps.  
KRAMER: SIMPLE CREATIVE TECHNOLOGY  
2
 
 
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:  
Use only good quality connection cables1 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 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  
wall adapter that is provided with this unit2.  
Warning – Disconnect power and unplug unit from wall  
before installing or removing device or servicing unit.  
1 Available from Kramer Electronics on our Web site at http://www.kramerelectronics.com  
2 For example, part number 2535-000245  
3
 
     
Your 907 Power Amplifier  
4
Your 907 Power Amplifier  
Figure 1 and Table 1 define the unit.  
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  
To connect the 907, as the example in Figure 4 illustrates, do the following1:  
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-  
switches (see Table 2).  
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  
Figure 2 and Figure 3 illustrate how to wire a balanced/unbalanced 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  
The 907 technical specifications are shown in Table 3:  
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.  
P/N: 2900-000523 REV 3  
 

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