Kingrex PREference User Manual

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

Introduction

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 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!

z 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.

z 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.

!!! 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. Also do not place the units near the

heat sources such as radiator, heat registers, stoves, or other devices (in cluding a m plifiers)

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: Neutral

Brown: Live

If the wires in the main lead do not match the colors marked in your plug, do the following:

 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.

 You must connect the blue wire to the pin which is marked with the letter “N” or colored

black.

 You must connect the brown wire to the pin which is marked with the letter “ L “ or

colored red.

 You must have a fuse in the plug, adaptor, or at the distribution board.
 The 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.

 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.

Introduction

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