Kingrex PRE-AMP User manual

KingRex PRE-AMP (pre-amplifier)
User Manual
Table of contents
Introduction
Contents of KingRex PRE-AMP preamplifier package
Specification
Safety instructions
A. Important safety instructions
B. Safety cautions
How to operate
Burn in
Maintenance
Service
Technical information

Introduction
Welcome joins KingRex usership
After the first integrated amplifier T20 visit the Hi-Fi field globally, KingRex never stop designing
and creating “good” sounding products. Gladly, there are lots of audiophiles keep trying KingRex
products, sharing their feedbacks, and providing their opinions to help KingRex knowing the “good
products” are worth to be expected and it is able to survive in harsh tests.
KingRex is not very big company and it makes us have more elasticity to create more fitting
personal demand Hi-Fi gears as desktop integrated ampl-T20U or our upgrade product –
PRE-AMP (version3.0).
KingRex is getting more and more High-End for providing better and better product. During these
days we are thankful for your appreciation for being our users. In the future, KingRex will keep
working on provide better and high quality audio product to delight your ears and life.
Hope you will fully enjoy the music!!!
Sincerely yours,
All KingRex staffs

Contents of KingRex PRE-AMP preamplifier package
PRE-AMP (v.3) pre-amplifier *1 pc
Universal AC power cord *1pc
User manual *1 pc
Warranty Card *1pc
Specification of PRE-AMP (V.3)
GAIN:11dB
THD+N :0.001%
DYNAMIC RANGE:123dB
FREQ RESPONSE:20HZ-20KHZ:+/-0.03DB
S/N RATIO:122DB
CROSSTALK @1K : 107 dB
CROSSTALK @10K : 87 dB
Safety instructions
A. Important safety instructions
Thank you for choose KINGREX PRE-AMP preamplifier. We sincerely hope you could
keep the user manual for whole PRE-AMP 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 will help you derive the overall performance and fully
extend the life that the PRE-AMP has to offer.
Please save this manual! It includes important instructions for the safely use PRE-AMP
and for obtaining factory service should the proper operation of the PRE-AMP come
into question.
Please save or recycle the packaging materials! The PRE-AMP’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 PRE-AMP for
service. Damage sustained during transit is not covered under the warranty.

B. Safety caution!
To reduce the risk of electric shock, disconnect the PRE-AMP from the mains supply
before installing an amplifier. Reconnect the power cord only after signaling
interconnections have been made.
The following precaution should be observed when power on:
-Remove watches, rings or other metal objects.
-Use tools with insulated handles.
!!! 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.
!!! 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 not expose this appliance to rain or moisture.
-Do not dispose of in fire to prevent injury or burns.
-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.
-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.

Using instruction:
How to operate
1. TURN OFF POWER SWITCH AND ADJUST VOLUME KNOB TO MIN VOL POSITION
2. CONNECT WITH SIGNAL SOURCE(CD PLAYER,TUNER,PC,……)SOURCING INPUT
TERMANAL (KINGREX PREAMP HAVE TWO SOURCE INPUT )
3. CONNECT PREAMP OUTPUT TO YOUR POWER AMP.
4. CONNECT AC POWER CORD TO WALL AC SOCKET
5. TURU ON PREAMP POWER SWITCH ,PREAMP WILL AUTO SELECT SOURCE INPUT
WHEN MUSIC START PLAY (THE OTHER INPUT MUST BE STOP PLAY OR MUTE)
6. ADJUST VOLUME KNOB TO YOUR FAVORITE LEVEL
7. FOR SAFETY REASON DO NOT OPEN THE PREAMP CASE OR MODIFY ANY CIRCUIT.
8. IF ONE INPUT ONLY, RECOMMON USE INPUT 1,AND SHORTED INPUT2 BY SHORTED
RCA PLUG. AVOID NOISE TO INTERFRENCE AUTO SELECT CIRCUIT.

Burn in
All new electronic equipment must be burned in to achieve optimum performance.
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.
Service
The simplicity of the KingRex PREference preamplifier 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.
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.
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~

KingRex Technology Co., LTD
ADD:13F-3, NO. 136, MINCHUNG W. RD ,103 TAIPEI TAIWAN
Tel: [phone]
Fax:[phone]
website: www.kingrex.com
email:[e-mail]