PREference pre-amplifier and phono stage
Contents
1. T SSE SSSR GN GR SS m mx connect with turntable Power AMP pium CD PLAYER TUNER DAC All of the inputs are line level inputs If a turntable is to be connected a special RIAA amplifier must either be fitted as a plug in module or an external must be connected in between the turntable and the PREference When using internal phonostage board the turntable directly input to IV How to operate Turning on the power of the PREference reserved power supply and using the left hand side rotary switch of the PREference preamplifier front panel KingRey A Selecting a source By turning on the mains supply the LED will illuminate The front panel LED circle of different input sources will light up when input has been selected The left hand side knob could be rotated by clockwise and anti clockwise both B Adjusting the volume The knob on right side of the front panel controls the volume On the outside of the knob a small dot in the indicates the level setting The scale goes from approx 8 o clock minimum to approx 4 o clock as maximum output level C Optional phono stage setting When you ordered the PREference pre amplifier set you could assigned the machine with or without the phono stage board If you did not choose the optional phono stage to amp the RIAA please pass reading this section of the PREference If you have chosen the phono stage for your PREference please2. Technology Co LTD KingRex Technology Co LTD website www kingrex cam email servicei kingrex net kingrex tectbmsa hinet net service kingrex com nm n LU a PREference pre amplifier and phono stage Table of contents Contents of KingRex PREference pre amplifier package Safety instructions A Important safety instructions B Safety cautions C Important warning I ntroduction A Introduction B Specification C Main feature PREference Pre amplifier phono stage specifications Connecting to the main A PREference pre amplifier B PREference Power supply unit C Optional PREference phono stage board Connecting other equipment D Input E Output Placement notice a Bad setting b Good setting How to operate F Selecting source G Adjusting the volume H PREference pre amplifier setting Maintenance Service Our best wishes Warranty card Contents of KingRex PREference pre amplifier package PREference pre amplifier 1 pc PREference power supply unit 1pc PREference DC power cord 1 pc User manual 1 pc Warranty Card 1pc Safety instructions A Important safety instructions Thank you for choose KINGREX PREference pre amplifier We sincerely hope you could keep the user manual for whole PREference life it provides you with better protection for connected equipment Please read this user manual very carefully It provides safety installation and operating instructions that
3. will help you derive the overall performance and fully extend the life that the PREference has to offer Please save this manual It includes important instructions for the safely use PREference and for obtaining factory service should the proper operation of the PREference come into question Please save or recycle the packaging materials The PREference s shipping materials were designing with great care to provide protection from transportation related damage These materials are invaluable if you ever have to return the PREference for service Damage sustained during transit is not covered under the warranty B Safety caution e To reduce the risk of electric shock disconnect the PREference reserved power supply unit from the mains supply before installing the PREference pre amplifier Reconnect the power cord only after signaling interconnections have been made e The following precaution should be observed when working on the power supply unit Remove watches rings or other metal objects Use tools with insulated handles I I Caution Risk of electric shock do not remove cover No user serviceable parts inside Refer servicing to qualified service personnel Warning To reduce the risk of fire replace only with the same type and rating of fuse II Warning To reduce the risk of fire or electric shock install in temperature and humidity controlled indoor area of conductive contaminants To prevent fire or shock hazard do no
4. AC POWERIN FUSE O SA Slow blew When pile up the PREference preamplifier and power supply unit the PSU transformer will bring interflow noise to get hum when using phono stage The interflow of transformer is super noise for the phono stage the iron shield or aluminum shield cannot shelter it all to avoid pile up the units will be the best solution Good setting O echnology vo LID IN MADE CAUTION A 9 e 9 i RISK OF ELECTRIC SHOCK KingRex Technology Co LTD MODEL PRETerence PSLI IN AC POWER IN FUSE 0 This is the placement position we would like to suggest you After setting the units as this position please do some testing as following procedure 1 Please power on the PREference PSU choose the input selector into IV phono stage input Please noted the volume should be set to the minimum and disconnect the input IV cable from preference side to make sure no any external noise into the preference Adjust the volume of PREference to suit your audition habit Please check the sound if there is any hum there and adjust the position of both units until there is no further hum of the interflow The very low level hiss sound is normal The wire setting obreros T LTD TP KingRex Technology Co LTD A CAUTION A MODEL FREtarence PSU RISK OF ELECTRIC SHOCK IN 1111 HT In
5. High gain 19 mV 6 6 mV MM MC Low gain 218 mV 72 mV MM MC Output Impedance 100 Ohms Input Impedance 100O0hms 220 Ohms 47kOhms switchable Input Capacitance P 100P switchable C Main feature PREference pre amplifier l Hi Fi quality low noise IC as main circuit gain is user selectable 7dB 14dB 20dB 2 Current booster design for increasing dynamic 3 DC Servo avoid any chances of harming the power amp and loudspeakers Free of signal lost in coupling capacitor design 4 The case is of a rigid construction and elegantly packed in fully aluminum anodized material 5 Front panel is 6 mm thickness aluminum panel with two aluminum knobs one is Rotary Encoder switch to select four inputs another is ALPS RK27 volume pot to provide the fully enjoyment of Hi Fi sound PREference Pre amplifier GAIN Setting V gain 2X 7db V gain 4X 14db V gain 8X 20db PREference power supply unit 1 Reserved power supply unit isolated power system design It provides pure signal sources less noise and distortion than switching power adaptor or build in power system 2 Using NEUTRIK gold plating XLR socket for DC output 3 Panasonic FM electrolytic capacitors stand on guard along critical paths with dedication to extremely low ESR 4 Rigid construction and elegantly packed in fully aluminum anodized case Optional phono stage Board To reach more Hi End users demand the PREference pre amplifier h
6. PANY The warranty is annulment by following condition The damage of machine by artificial damage improper using repair or refit by yourself nature disaster lightening strike leaking water using power voltage didn t follow designated unable provide warranty certification unmatched model NO Empty or alter content of warranty cannot recognize content of warranty certification PURCHASE DATE Client Information Name KINGREX TECHNOLOGY CO LTD 2F NO232 LIANCHENG RD JHONGHE Address CITY TAIPEI TAIWAN 235 kingrex tec msa hinet net KingRex Technology Co LTD ADD 13F 3 NO 136 MINCHUNG W RD 103 TAIPEI TAIWAN Tel 886 2 2557 2156 Fax 886 2 8226 2626 website www kingrex com email service kingrex com
7. and yet highly adaptable the ideal for outputting to power amplifiers A separate high performance power supply unit further guarantees an interference free working condition Panasonic FM electrolytic capacitors stand on guard along critical paths with their dedication to extremely low ESR Both the preamp and the PSU are housed in all aluminum chassis A special feature is the Sliding door on top of the preamp opening up to phonostage settings MC moving coil MM moving magnet with high low gain and 6 pre set resistive loads Boasting impressive full frequency range with THD as low as 0 0005 and dynamic range better than 126dB the PREference will be the chosen one for discerning audiophiles B Specification PREference preamplifier Inputs RCA 4 Frequency Response Range 20Hz 20Khz 0 0 1dB 5Hz 80Khz 0 1 0dB Maxium Input Level 9Vrms OdB THD Noise 0 000596 1KHz Input Sensitivity 1 1V For 2 5V Out dB Gain 510mV For 2 5V Out 14dB Gain 250mV For 2 5V Out 20dB Gain Signal to Noise Ratio 126dB Channel Separation 112dB 1KHz 92dB 10KHz Phonostage option Specifications Signal to Noise Ratio 112dB MM Low gain 104dB MC Low gain THD N Ratio 0 000696 MM LOW Gain 0 0196 MC LOW Gain Crosstalk at 1KHZ 94dB MM Low gain 79 dB MC Low gain Crosstalk at 10kHz 100dB MM Low gain 86dB MC Low gain Gain at 1k Hz High gain 44 dB 63 dB MM MC Low gain 24 dB 43 dB MM MC Max Input Level
8. as one additional design for phono stage Board Characteristic e High quality audio integrated circuit by plug in design flexible for vinyl enthusiast to for getting exceptional signal purity and low noise operation e Adapting MM moving magnet MC moving coil cartridge total 6 pre set resistive loads with high low gain by DIP SW adjust e Easy setting by upper sliding case design this unit will fit the most demanding of audiophile systems How to install the optional phone stage circuit board with the main 1 Open PREference pre amplifier top cover Remove JPF1 jumper Install the phono stage Board Lock the screw 2pcs screw Cover the top cover amp LO M Connecting to the mains PREference has been especially made for the country to which it has been shipped Any attempt to change the voltage or other types of modifications should be considered unsafe and may cause damage to both the preamplifier reserved power supply unit and other connected equipment Warranty is annulled by any form of modification performed by any person not authorized by KingRex Please connect the PREference to the main supply with the supplied IEC main cable and DC cable by KingRex For further improvements to the level of sound quality various type of mains cable type may be tested Like the importance of any other cable in the system the quality and refinement of the mains cable has an influence on the total balance o
9. ation of instructions provided in this user manual or to products which have been altered or modified This warranty doex not extend to products which have had the serial number removed altered or rendered illegible Physically damaged products are not covered by this warranty and will be returned as received without repair Our best wishes We at KingRex only use the best raw materials trimmed and rafted to perfection by the best engineers and sound enthusiasts for all audiophiles The guidance lines in this manual will assure you of an exquisite sound experience hope it will provide clear instruction to operate our products We hope you years of proud ownership and happy listening We feel confident that you will cherish this amplifier for both its amazingly clear reproduction as well as for its splendid craftsmanship elegant appearance and convenient size Hope you won t mind to share with us if there is any problem or questions Please do not hesitate to contact with us We look forward to hearing from you NOTICE INFORMATION KingRex Warranty PRODUCT The breakdown of product is not artificial The SERIAL NUMBER warranty for exchange new product is only one month after purchasing and the free fixing service is only for one year after purchasing After the warranty we still offer repairing service change for service amp components lt The warranty content of our service PURCHASING COM
10. eutral Brown Live If the wires in the main lead do not match the colors marked in your plug do the following B You must connect the green and yellow wire to the pin marked by the letter E or by the safety Earth symbol or colored green and yellow or green B You must connect the blue wire to the pin which is marked with the letter N or colored black B You must connect the brown wire to the pin which is marked with the letter L or colored red B You must have a fuse in the plug adaptor or at the distribution board B he power supply cord should be rounted so that it is not likely to be walked on or pinched especially near the plug convenience receptacles or where the cord exists from the unit B The power supply cord of the unit should be unplugged from the wall outlet when it is to be unused for a long period of time I ntroduction A Introduction PREference the second generation pre amplifier from KingRex is a logical extension of the success store award winning Preamp Centered around high quality op amp and the diamond buffer highly praised for its musicality a current booster has been added to the final output of the amplifier stage to enhance drivability DC servo circuit has also been implemented to avoid unwanted audio signal loss due to coupling capacitors Volume control is ALPS Gain is user selectable with a choice 7 14 or 20dB The result is accurate and perfect signal amplification free from colouration
11. f the sound please feel free to experiment with the various brands available in your country Please noted that KingREx cannot accept responsibility for damage incurred due to improper usage connection or manufacture of other cables than the enclosed D Connecting to other equipment The KingRex PREference Pre amplifier features several types of inputs and output KingRex Technology Co LTD MODEL PREference MADE IN TAIWAN Cee DO NOT OPEN Cee OF ELECTRIC SHOCK A 1 E O 2 VCC GER x OJ 3 GND DC POWER FROM PSU OUTPUT IV All of the inputs are line level inputs If a turntable is to be connected a special RIAA amplifier must either be fitted as a plug in module or an external must be connected in between the turntable and the PREference Remark 1 When the optional phono stage Board installed the vinyl signal will pass through IV input Please do not connect with any other line level output device or it will have the funny sound into your loudspeakers 2 Please note that all connectors of the PREference are gold plated This is done to ensure long lasting and stable connections Do only use cable and connectors either gold or silver plated Output One pair unbalanced signal line out Placement Notice When Phonostage Installed Bad setting NOSE Pe Co LTD oOo 0o 0 0 0 0000 oO0090 000000 KingRex Technology Co LTD CAUTION 4 MODEL PREference PSU MADE IN TAIWAN
12. formance Please allow the new pre amplifier and reserved power supply unit to burn in by playing music with the loudspeakers connected for 200 hours before critical listening is performed Maintenance For cleaning the cabinet use a dry cloth and wipe dust away If needed moisturize the cloth with a small amount of window cleaning dissolvent Do not use excessive amounts of solvents and do not let any of solvent spill into amplifier The front panel is made of aluminum it can be cleaned by using normal mild solvents and clean paper tissue or cloth Do not use any other the scratch the mirror display at the front Please do not place this unit on an unstable cart stand tripod bracket or table The unit may fall causing serious injury to a child or adult and serious damage to the unit Any mounting of the devices should follow the manufacturer s instructions and should use a mounting accessory recommended by the manufacturer Please read all the safety and operating instructions before connecting or using this unit Retain this notice and the user manual for future reference Service The simplicity of the KingRex PREference pre amplifier and reserved PSU are very few parts can be breaking down Should you ever require service you can either contact your dealer or national distributor who can solve any problems locally The units should be serviced by qualified service personnel technician dealer or distributor when 1 The un
13. its have fallen or liquid has been spilled into the units 2 The units have been exposed to rain or liquid of any kind 3 The units do not appear to operate normally or exhibits a marked change in performance 4 The units have been dropped or the enclosure damaged You are also very welcome to contact KingRex Technology Co LTD directly if you need any information or help Our contact information is listed on the last page of this user guide Your Responsibilities The above warranties are subject to the following conditions 1 You must retain and present your dated invoice order record or bill of sale to provide proof of original purchase from a KingRex Authorized dearler and coverage under the warranty period You must notify us within thirty 30 days after you discover a defective product or part as we only provide one month free replacement unit All warranty servicing of this product must be done by KingRex authorized dealer or distributor or KingRex Charges by third parties for set up installation adjustments shipment insurance and other charges are not covered by this warranty This warranty extends only to defects in material workmanship as limited above and does not extend to any product or part which has been lost or discarded by you or to damage to products or parts caused by misuse accident any nature forces as lightening fluctuations in electrical power improper maintenance or use in viol
14. read about the instruction included the safety instruction and safety notice 1 When you received the PREference you might notice there are one frame and one engraved PREference sliding aluminum panel The sliding panel could be pull out there are two DIP switch of R amp L channel on the phono stage board and also there is phono stage setting instruction manual printing on the top cover of the PREference aluminum panel underneath the sliding panel The instruction could help you to set the gain to fit the requirement of your cartridge 2 Caution The sliding panel only uses the magnet to stick on the panel and the frame Please do not toward the machine slant to avoid the sliding panel drop unexpected 3 The cartridge in market has lots of different gain setting requirement KingRex sets the most in common standard for user to fit If there is no same setting for your cartridge please choose the closest setting to suit your cartridge requires If there are two similar setting please test them both and choose the one you prefer the most We would like to suggest you to test the gain setting from Low Gain to High Gain Normally the performance of the low gain might be better as the noise might be lower TOTALGAIN SWI HIGH LOW CARTRIDGE M M m OFF IMPEDANCE 5W3 47K OFF 2200 OFF 1000 100 47 100 2200 100P 1000 Burn In All new electronic equipment must be burned in to achieve optimum per
15. t expose this appliance to rain or moisture Do not dispose of in fire to prevent injury or burns Also do not place the units near the heat sources such as radiator heat registers stoves or other devices including amplifiers that produce heat Do not disassemble the machine with power on If you do you may receive an electric shock Do not let children or grownups push anything into holes or slots in the case this could result in harmful electrical shock and could cause damage of the equipment Do not set these units near the water near following area bathtub washbowl kitchen sink laundry tub wet basement or swimming pool Obstruct the necessary all around ventilation especially DO NOT place the set close to curtains or on soft furnishing such as carpets Overheating can cause unnecessary damage and shorten the lifespan of the equipment No user serviceable parts inside Refer servicing to qualified technician Never remove the cover unless qualified to do so This unit contains dangerous voltage Read the user manual and familiarize yourself with the functions before you attempt to use this equipment C Important warning You must earth this machine The PREference PSU is going through 3 wires power cord and wall ac socket If you cut off the mould plug get rid of it straight away You cannot rewire the plug it into a socket The wires in the mains lead have the following color code Green and Yellow Earth Blue N
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