Krell Industries KSP7B User's Manual
Contents
1. RRELL 45 Connair Road Orange CT 06477 0533 USA Turn nn man o a nn OH a ree a _ nn KSP 7B STEREO PREAMPLIFIER OWNER S MANUAL INTRODUCTION amp GENERAL INFORMATION Thank you for purchasing the KRELL KSP 7B Preamplifier The KSP 7B is the latest evolution of KRELL s entry level preamplifier technology Many of its design concepts are similar to our more expensive preamplifiers and are wholly unique to KRELL Two important design features are dual mono operation all active stages are powered by independent tracking regulators and the complete absence of any capacitors in the signal path The KSP 7B retains other features for which KRELL preamplifiers have become recognized internally switchable loading for moving coil cartridges and input capacity rarely found on high end preamplifiers All circuitry in the KSP 7B is of completely new design many aspects of which are derived from the top of the line KRS Balanced Reference Preamplifier The most significant of these is the fully balanced output stage Balanced circuitry has long been standard for professional audio equipment and is rapidly becoming the standard for high end audio equipment The sonic benefits of balanced operation are clearly audible A simple listening comparison between the RCA single ended and the XLR balanced outputs will reveal improvements in all areas of sonic quality The connection of the KSP 7B in single ended and balanced systems is covered2. on page five Please read this manual thoroughly before using the KSP 7B Installation and operation are simple to understand and perform The KSP 7B will provide many years of trouble free performance Please be sure to return the enclosed warranty registration card THE RS AL The KSP 7B Owner s Manual is divided into various groups of information The purpose of he document as a whole is to familiarize you with the unit and guide you through its set up installation and operation in a logical progression The Table of Contents is as follows _A Unpacking B Phono Section Set Up C Installation 1 Cautions 2 Unit Location Guidelines and Installation 3 Connection of Inputs and Outputs 4 Turn on of the Preamplifier D Operation E Warranty and Service Information A UNPACKING Remove the KSP 7B power supply and accessories from the shipping container Store all packing materials in a cool dry place for future use Inspect the unit for shipping damage if any damage is evident contact your dealer immediately If the unit is in proper condition proceed with installation In addition to the preamplifier and power supply you will find a small L shaped allen driver This is used to remove the top cover to gain access to the phono section gain and input impedance loading adjustments Set up of the phono section should be completed before installation of the preamplifier PH E TION SET UP Important N ns F
3. ate of purchase Please return the completed warranty card immediately after successful installation and operation are completed The warranty for KRELL products is valid in the country to which they were originally shipped and at the factory If you think there are problems with your unit please contact your dealer or the factory immediately Should your unit need to be repaired contact the factory or your dealer distributor for a return authorization Freight to the factory or dealer distributor i 1s your responsibility Return freight to you will be paid by the factory or distributor
4. custom RCA connectors are made to very exacting standards Connectors of lesser quality may damage them or cause poor connections Please check with your dealer or the factory if you have any questions nit L ion Guidelin nd Install The KSP 7B is designed to be set up with the power supply installed at some distance from the preamplifier chassis This is to eliminate the possibility of hum being induced into the phono section The motors in CD players or tape decks can also induce hum into the phono section and in most cases should be placed at least a foot away from the KSP 7B Before proceeding with the final installation please read and complete the set up of the phono section loading These operations involve removal of the top cover and are much easier to accomplish before the unit is fully in place Instructions and settings are listed in Section B Pages 2 amp 3 a Power ly Location Guidelin The KSP 7B power supply measures 7 1 4 wide 8 1 4 deep and 2 1 2 high Six foot AC and DC cables are provided with the supply Plan the position of the supply and preamplifier within these lengths Allow a small amount of cable to be excess so that neither cable is pulled tight Contact the factory if the DC cable is too short Any attempt to extend it jeopardizes the power supply and the preamplifier and will void the unit s warranty Although well shielded the power supply should not be placed close to hum sensitive components suc
5. h as turntables phono preamplifiers or tape decks Allow ample air space around the supply for heat dissipation Five inches on top and two inches on each side is adequate This supply and any other should not be one on top of the other They should be placed side to side This supply does not require that an AC circuit be dedicated for its use only It should be connected to a 15 or 20 amp circuit that is dedicated for _ the source components and preamplifier Do not connect this supply to the mains with light gauge 18 or higher extension cords or multiple outlet adapters AC extension cords outlet strips and good quality surge protectors that are rated for 15 amps and are grounded are acceptable Preamplifier Locati idelin The KSP 7B chassis measures 18 3 8 wide 13 1 2 deep and 2 high Four inches clearance should be allowed above the top of the KSP 7B Only a small amount of clearance is needed on the sides Four to six inches clearance should be allowed at the rear of the unit to provide for cables c Power 1 reamplifier Installation i Place the power supply in location ii Place the preamplifier in location iii Connect the DC cable from the supply to the preamplifier iv Do not plug the AC connector into the mains at this time but make certain the cable length is adequate 3 Connection of Inputs and Outputs All source components should be off at this point a Connection of Inp ur Follow the markings
6. it is not being listened to 2 Tape Use the Tape switch to choose between the output of the Select switch or the playblack from a tape deck for monitoring This can be done when a recording is being made such as with a three head tape deck or during playback only 3 Gain Use the Gain Sun switch to adjust the overall gain of the line section to compensate for different system efficiencies The amount of gain for the two settings of the Gain switch are as follows 12 dB LOW 6dB 4 Phase Use the Phase toggle switch to reverse the absolute phase of the Main Outputs The switch i is functional for both the single ended and balanced outputs Many recordings have had their overall phase reversed during the various processing stages When the absolute phase and phase relationship between channels is correct there are improved transients and dynamic detail 5 Balance Use the Balance control to adjust the level between the two channels if necessary The Balance control is really a balance attenuator When the control is turned clockwise the left channel is reduced in level in four single decibel steps a fifth en Off van clockwise turns the left channel off 6 Volume Control Use the Volume control to adjust the listening level It should always be fully counterclockwise when the system is not in use or when changing records or sources E WARRANTY The KSP 7B has a limited warranty of five years from the d
7. ntrol should be fully counterclockwise The amplifier s should be off Connect the power supply to the AC mains at this point The LEDs on the power supply and KSP 7B should now be illuminated b Future Use The KSP 7B is designed to be on at all times In other words it is not intended to be switched on and off on a routine basis The only times it is recommended to turn the unit off is when your system will be left unattended for a long period of time such as during a vacation or a business trip In these cases all other equipment should be turned off and the KSP 7B power supply should be disconnected from the AC mains When you return reconnect the power supply to the AC mains before turning on other equipment This procedure should also be followed if you reorganize your system and need to change wiring of the supply to the preamplifier D OPERATION 1 Select Use the Select sd to choose between the various source playback components for listening Be sure to lower the volume control when switching among components as large differences in level between sources can cause damage to other components There is a Mute position that should be used when source components are being turned on and off and at the completion of each listening session Note Components that are not being listened to should be turned off or have their volume turned down For instance a tuner should be turned off or have its volume lowered while
8. on the rear panel for proper input assignments Make the connections between the source components and preamplifier inputs at this time b Connection of Record Outputs There is one set of Record Outputs which receive the signal from the input chosen on the Select switch for sending to a tape deck Make the connections between the Record Outputs and tape deck at this time c Connection of Main There are two sets of Main Outputs one set single ended using RCA connectors one set balanced using XLR connectors They are wired in parallel and can be connected and operated simultaneously There is no degradation to either output if both are connected whether one or both are in operation at the same time You may even choose to drive two independent systems from your KSP 7B i For use with aniplifiers with single ended unbalanced inputs connect the RCA Main Outputs to the amplifier inputs This constitutes the conventional hook up for a single ended unbalanced system ii For use with amplifiers with balanced inputs connect the XLR Main Outputs to the amplifier inputs The pin assignments are as follows 1 ground 2 non inverted output 3 inverted output Make the connections between the Main Outputs and amplifier s and or crossovers at this time 4 Turn on of the Preamplifier a Initial Turn on All source components should be off at this point The Select switch should be set to the Mute position and the volume co
9. or the initial adjustment of the phono section the KSP 7B should not be connected to its power supply For adjustments to the phono section input impedance after the initial set up as discussed below please note the following r adj ny_of the internal switches whil amplifier the KSP 7B is driving is turned on Moving Coil Cartridge s The KSP 7B is shipped with the phono section gain set for moving coil cartridges and a load of 800 ohms The load can be changed with a set of internal switches To access these the top cover must be removed with the supplied allen driver At the left rear of the unit there is a two position toggle switch In the factory supplied position the switch lever is towards the rear panel of the unit If you are using a moving coil cartridge do not change the switch position To adjust the input impedance load for different moving coils use the table below to find the optimum setting for your cartridge Follow your dealer s or the manufacturer s recommendations first You can also set the load using your sonic preferences as a guide In general lowering the impedance will make the high frequencies less prominent and the overall sound warmer Higher loads make the overall sound more vivid and detailed This is of course highly subjective and very dependent on the cartridge in use The various load possibilities are detailed below all switches in the open position 47 000 ohms all switches open except 8 on 1 000 ohm
10. s all switches open except 7 on 800 ohms all switches open except 6 on 470 ohms all switches open except 5 on 250 ohms all switches open except 4 on 100 ohms all switches open except 3 on 47 ohms all switches open except 2 on 25 ohms all switches open except 1 on 10 ohms all switches on 5 ohms Moving Magnet Cartridges To set the Phono section for Moving Magnet operation with the impedance adjusted to 47 000 ohms set the phono gain switch towards the front of the preamplifier This lowers the gain of the phono section to compensate for the higher output of moving magnet cartridges Set all impedance switches for both channels to off C INSTALLATION 1 Cautions Note These are important points of which you always should be aware They are presented before the actual installation procedures should you not read through the manual entirely a Do not connect the power cord into the AC mains before completing the Installation section b The power amplifier s should always be turned off while connections c When installing the KSP 7B always connect the DC cable between the preamplifier chassis and the power supply before plugging the power supply into the AC mains d Always disconnect ei AC from the mains before disconnecting the DC cable from the preamplifier e The KSP 7B Select switch should be in the Mute position and the volume control fully counterclockwise while making connections f Our
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