USER MANUAL
Contents
1. KRAMER Kramer Electronics Ltd USER MANUAL Personal Stereo Amplifier Model 902 IMPORTANT Before proceeding please read paragraph entitled Unpacking and Contents KRAMER ELECTRONICS LTD KRAMER Section l Ne COM IYUNDDAWBWWN YH NO A N Figure Table Table of Contents Name INTRODUCTION A Word on Audio Amplifiers Factors Affecting Quality of Results HOW DO I GET STARTED UNPACKING AND CONTENTS Optional Accessories Getting to know your 902 CONNECTING TO AUDIO DEVICES USING THE AMPLIFIER Turning on the machine Operation SPECIFICATIONS TROUBLESHOOTING Power and Indicators Audio Signal Limited Warranty List of Illustrations Description 902 Front Rear Panel Features List of Tables Description 902 Front Rear Panel Features KRAMER ELECTRONICS LTD 1 age OWMMDAINDDAANURWWWNHNs Page Page KRAMER 1 INTRODUCTION Congratulations on your purchase of this Kramer amplifier Since 1981 Kramer has been dedicated to the development and manufacture of high quality video audio equipment The Kramer line has become an integral part of many of the best production and presentation facilities around the world In recent years Kramer has redesigned and upgraded most of the line making the best even better Kramer s line of professional video audio electronics is one of the most versatile and complete available and is a true leader in terms of quality workmanship pri2. 1 Vpp 50k on RCAs Stereo headphone loudspeaker terminal block automatic switching when headphone is plugged in BANDWIDTH 20 kHz 3dB oo BANDWIDTH 20 kHz 3dB S N RATIO 68 dB unweighted THD NOISE 0 059 E A IkHz 1 Volt 2 HARMONIC 0 025 eee Input selector switches BASS 70 Hz MID 1 kHz TREBLE 15 kHz 15dB Volume Balance and Loudness controls 19 cm x 13 5 cm x 2 5 cm 7 5 x 5 3 x 0 98 W D H WEIGHT 0 6 kg 1 32 lbs Approx ACCESSORIES 12 VDC power supply KRAMER ELECTRONICS LTD 7 af KRAMER 8 TROUBLESHOOTING NOTES Please note that if the output signal is disturbed or interrupted by very strong external electromagnetic interference it should return and stabilize when such interference ends If not disconnect the machine from the power source and then reconnect it to reset the machine If the following recommended actions do not result in satisfactory operation please consult your KRAMER dealer Power and Indicators Confirm that power connections are secured at the machine and at the receptacle Make sure the receptacle is active outputting the proper voltage If there is still no power use a Philips screwdriver to remove screws on both sides of the machine s cover Locate the fuse inside your machine Confirm that the fuse is good by looking for the wire connected between the ends of the fuse If this wire is broken replace fuse with another with the same r
3. ACKING AND CONTENTS The items contained in your Kramer switcher package are listed below Please save the original box and packaging materials for possible future shipment YYYY YY The 902 machine DC wall transformer power supply This User Manual Kramer concise product catalog CD Rubber feet Mounting brackets KRAMER ELECTRONICS LTD 3 KRAMER 3 1 Optional Accessories The following accessories which are available from Kramer can enhance implementation of your machine For information regarding cables and additional accessories contact your Kramer dealer LJ VM 50H for adding additional headphone outputs a high quality 1 5 stereo headphone distribution amplifier using 4 TRS connectors It accepts one stereo headphone or line input source and distributes it to five identical outputs providing each output with an independent level control Apart from its standard use the VM 50H can also drive low impedance headphones or five sets of small loudspeakers It has a mono switch designed to ensure that a mono input signal is routed to both sides of the headsets and can deliver 10 identical mono outputs instead of five stereo outputs The VM 50H comes with an external 12VDC power supply for typical operation but the optional VA 50P can power up to six Kramer products requiring 12VDC It is housed in a rugged desktop enclosure but using the RK 50R kit two can be rack mounted in two vertical spaces of a standard 19 r
4. ack L 4x4A for adding inputs to the 902 a simple high quality 4x1 stereo audio switcher and a 1 4 distribution amplifier It accepts four stereo audio inputs and distributes the selected input to 4 outputs The machine uses 3 5 mm mini phone connectors and is therefore perfectly suitable for PC generated multimedia and presentation applications A 12V power supply is provided but the optional VA 50P can power up to six Kramer devices requiring 12VDC The 4x4A is part of the Kramer TOOLS family of compact high quality and cost effective solutions for a variety of applications KRAMER ELECTRONICS LTD 4 KRAMER 4 GETTING TO KNOW YOUR 902 The Kramer 902 is a high performance Personal Stereo Amplifier for multimedia and presentation use for quick local audio amplification It features easy control of Treble Mid Bass Volume and stereo Balance settings on front panel control buttons The machine also provides a Loudness control switch for automatic equalization in low volume listening It can output up to 22 Watts peak power far more than is needed for personal and small presentation applications The machine has four inputs three inputs on standard RCA connectors and one on a mini 3 5 mm socket for easy interface with a sound card or any music player portable CD player minidisk player walkman etc It has a headphone output and loudspeakers output When the headphones are plugged in the loudspeakers are automati
5. ating Install cover and tighten the Philips screws 8 2 Audio signal No audio atthe Confirm that the right input is selected and is active 2 Confirm that the Volume control is not at minimum output device setting MPAT CSO N Confirm the power LED is lit and you are using an selected appropriate power supply KRAMER ELECTRONICS LTD 8 af KRAMER LIMITED WARRANTY Kramer Electronics hereafter Kramer warrants this product free from defects in material and workmanship under the following terms HOW LONG IS THE WARRANTY Labor and parts are warranted for three 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 the warranty 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 www kramerelectronics com 2 Any product on which the serial number has been defaced modified or removed 3 Damage deterioration or malfunction resulting from a Accident misuse abuse neglect fire water lightning or other acts of nature b Product modification or failure to follow instructions sup
6. authorized Kramer technician Any user who makes changes or modifications to the unt without the expressed approval of the manufacturer will void user authority to operate the equipment Use the supplied DC power supply to feed power to the machine Please use recommended interconnection cables to connect the machine to other components LO LO KRAMER ELECTRONICS LTD 10 KRAMER KRAMER The list of Kramer distributors appears on our web site www kramerelectronics com From the web site it is also possible to e mail factory headquarters We welcome your questions comments and feedback Kramer Electronics Ltd 3 Am VeOlamo Street Jerusalem 95463 Israel Tel 972 2 654 4000 Fax 972 2 653 5369 E mail kramerel netvision net il
7. cally disconnected The 902 is part of the Kramer TOOLS family of compact high quality and cost effective solutions for a variety of applications though it is slightly larger than the others Tome tT L R Left Right Left Right Left Right 12 a DC OUTPUT INPUT 4 INPUT 3 INPUT 2 INPUT 1 KERAMER KRAMER Personal Stereo Amplifier 902 PHONES ON LOUD BAL VOLUME BASS MID TREBLE INPUT SELECTOR 4 3 2 1 6066666 o Figure 1 902 Front Rear Panel Features KRAMER ELECTRONICS LTD 5 af KRAMER Table 1 902 Front Rear Panel Features 12 15 VDC Power connector The socket for the 12 15 VDC power source wall transformer battery etc Loudspeaker output connectors Left and Right appropriate ground connectors outputs to loudspeaker Line 4 1 Input connectors Stereo Audio line level inputs Input 1 is on a 3 5mm mini socket 2 to 4 on RCAs connector ee machine rpm quality listening at low volume levels channels 5 CONNECTING TO AUDIO DEVICES Up to four audio sources may be connected to the 902 machine Input 1 uses 3 5mm socket common to computer sound cards minidisk players walkman machines etc Inputs 2 4 use standards stereo RCA connectors The outputs may be either a stereo headphone set or a set of stereo loudspeakers When the headphone is plugged in the speakers get automatically disconnected 6 USING THE AMPLIFIER 6 1 Turning on the Machine gt The machine is turne
8. ce performance ratio and innovation In addition to the Kramer line of high quality mixers such as the one you have just purchased Kramer also offers a full line of high quality distribution amplifiers switchers processors interfaces controllers and computer related products This manual includes configuration operation and option information for the 902 Personal Stereo Amplifier 1 1 A Word on Audio Amplifiers Audio signals in order to be heard by our ears should be amplified in order to be able to drive headphones or loudspeakers Line level audio signals traveling within an audio system or generated from a PC are usually too weak to drive large loudspeakers and need further amplification A good quality audio amplifier for personal PC or Presentation use should have the following features 1 The output of the amplifier should be a high quality signal Hi Fi 2 The amplifier should have several optional inputs that the user can select for amplification 3 The user should be provided with all audio parameters controls Bass Treble Midrange tone controls Volume audio output level stereo signal Balance and Loudness control 4 The amplifier should have speaker and headphones outputs 5 The output levels should be sufficient to drive the loudspeakers with a reasonable volume filling a medium sized room with ample sound 6 The machine should be small in dimensions for easy installation and control 7 Power suppl
9. d on when the power supply is connected to the power socket Observe proper voltage and polarity B gt The machine should only be turned on after all connections are completed and all source devices have been turned on Do not attempt to connect or disconnect any audio signal to the machine while it is turned on KRAMER ELECTRONICS LTD 6 KRAMER D gt 6 2 7 The socket outlet should be near the equipment and should be easily accessible To fully disconnect equipment remove the power adapter from the socket When power is applied to the machine via the 12 15 VDC socket at the proper polarity the machine will turn on and the ON LED will glow Operation Connect the audio sources to be amplified and select by using the input selector switch panel the desired input for amplification Connect if needed the loudspeakers Connect the hot usually red coded wire of the Left loudspeaker to the L socket and the cold usually black coded to the adjacent G ground socket Connect the hot usually red coded wire of the Right loudspeaker to the R socket and the cold usually black coded to the adjacent G ground socket If you plug in the stereo headphone to the PHONES socket the loudspeakers get automatically disconnected Connect an appropriate 12 15VDC source to the DC socket of the 902 Observe polarity The ON LED will light Adjust the controls as required SPECIFICATIONS stereo
10. plied with the product c Repair or attempted repair by anyone not authorized by Kramer d Any shipment of the product claims must be presented to the carrier e Removal or installation of the product f Any other cause which does not relate to a product defect g Cartons equipment enclosures cables or accessories used in conjunction with the product WHAT WE WILL PAY FOR AND WHAT WE WILL NOT PAY FOR We will pay labor and material expenses for covered items We will not pay for the following 1 Removal or installations charges 2 Costs of initial technical adjustments setup including adjustment of user controls or programming These costs are the responsibility of the Kramer dealer from whom the product 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 KRAMER ELECTRONICS LTD 9 KRAMER 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 OF IMPLIED WARRANTIES All implied warranties including warranties of merchantability and fitness fora par
11. ticular purpose are limited in duration to the length of this warranty EXCLUSION OF DAMAGES Kramer s liability for any defective products is limited to the repair or replacement of the product at our option Kramer shall not be liable for 1 Damage to other property caused by defects in this product damages based upon inconvenience loss of use of the product loss of time commercial loss 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 and exclusions may not apply to you This warranty gives you specific legal rights and you may also have other rights which vary from place to place NOTE All products returned to Kramer for service must have prior approval This may be obtained from your dealer NOTICE This equipment has been tested to determine compliance with the requirements of EN 50081 Electromagnetic compatibility EMC generic emission standard Part 1 Residential commercial and light industry EN 50082 Electromagnetic compatibility EMC generic immunity standard Part 1 Residential commercial and light industry enviroment CFR 47 FCC Rules and Regulations Part 15 Radio frequency devices Subpart B Unintentional radiators CAUTION E Servicing the machines can only be done by an
12. y should flexible All of those functions are provided with the Kramer 902 Personal Stereo Amplifier KRAMER ELECTRONICS LTD 2 KRAMER 1 2 Factors Affecting Quality of Results There are many factors affecting the quality of results when signals are transmitted from a source to an acceptor Ey D gt 2 Connection cables Low quality cables are susceptible to interference they degrade signal quality due to poor matching and cause elevated noise levels They should be of the best quality Sockets _and_ connectors of the sources and acceptors So often ignored they should be of highest quality since Zero Ohm connection resistance is the target Sockets and connectors must also match the required impedance Cheap low quality connectors tend to rust thus causing breaks in the signal path Amplifying circuitry Must provide quality performance when the desired end result is high linearity low distortion and low noise operation Interference from neighboring electrical appliances They can have an adverse effect on signal quality Balanced audio lines are less prone to interference but unbalanced audio should be installed far from any mains power cables electric motors transmitters etc even when the cables are shielded HOW DOI GET STARTED The fastest way to get started is to take your time and do everything right the first time Taking 15 minutes to read the manual may save you a few hours later 3 UNP
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