Musical Fidelity KW250S 用户手册
KW250S
GENERAL INSTALLATION
Issue 2: 19th June 2006
Page 7 of
24
INTRODUCTION
Congratulations on the purchase of your new KW250S
integrated CD/DAB/FM/PRE and dual mono power amp.
The KW250S is one of the most comprehensive fully
integrated Hi-Fi designs ever made, and, encloses the best
elements out of all our separates into one convenient box.
The CD player has extremely low jitter, vanishingly low
distortion, exemplary linearity and ultra low noise. The tuner
is designed to bring DAB into the realms of hi-fidelity sound
reproduction to complement the very latest technology
DAB/FM receiver circuit. Great attention has been paid to
internal layout, isolating each circuit section to prevent
possible interaction.
The CD, DAB and FM digital data streams are first up-
sampled to 192kHz, which moves noise, jitter and distortion
artefacts well above the audio band. They are then passed
through a new, low noise, low distortion 24-bit dual-
differential digital-to-analogue converter, which allows
simpler filtering of the analogue output. This in turn gives an
improved audio response without the need for sharp filters that
degrade sound quality. The result is a CD player and
DAB/FM tuner which has a smoother response than
previously possible with none of the “hardness” of other units.
The preamplifier sections are our finely tuned and tweaked
tube input line level preamplifier for smooth tube sound
coupled with low noise and virtually no distortion. This also
includes our top quality low noise phono stage which caters
for both MM and MC cartridge users.
The power amplifier consists of two mono block amplifier
modules with completely separate supplies for the absolute
best in separation and imaging. Rated for 250W nominal they
are enough to drive even the most demanding loudspeakers
with ease. Low distortion and very quiet they will deliver all
music types exactly as the artist originally intended!
The resultant performance achieved by this unit is among the
best in the world. It has excellent signal to noise ratio, low
distortion, wide bandwidth, huge dynamic range,
extraordinary resolution and fine detail.
INSTALLATION
Position the KW250S on a stable, horizontal surface where
there is no risk of it being knocked, or subjected to vibration
such as from loudspeakers.
Protect your KW250S from humidity - if the unit is moved
from a cold place to a warm room, or in generally humid
conditions, moisture can form on the pickup lens inside the
player, preventing the laser beam from reading the disc. If this
happens, remove the CD, close the disc drawer, and leave the
unit switched on for an hour or so to allow sufficient time for
the moisture to evaporate.
Congratulations on the purchase of your new KW250S
integrated CD/DAB/FM/PRE and dual mono power amp.
The KW250S is one of the most comprehensive fully
integrated Hi-Fi designs ever made, and, encloses the best
elements out of all our separates into one convenient box.
The CD player has extremely low jitter, vanishingly low
distortion, exemplary linearity and ultra low noise. The tuner
is designed to bring DAB into the realms of hi-fidelity sound
reproduction to complement the very latest technology
DAB/FM receiver circuit. Great attention has been paid to
internal layout, isolating each circuit section to prevent
possible interaction.
The CD, DAB and FM digital data streams are first up-
sampled to 192kHz, which moves noise, jitter and distortion
artefacts well above the audio band. They are then passed
through a new, low noise, low distortion 24-bit dual-
differential digital-to-analogue converter, which allows
simpler filtering of the analogue output. This in turn gives an
improved audio response without the need for sharp filters that
degrade sound quality. The result is a CD player and
DAB/FM tuner which has a smoother response than
previously possible with none of the “hardness” of other units.
The preamplifier sections are our finely tuned and tweaked
tube input line level preamplifier for smooth tube sound
coupled with low noise and virtually no distortion. This also
includes our top quality low noise phono stage which caters
for both MM and MC cartridge users.
The power amplifier consists of two mono block amplifier
modules with completely separate supplies for the absolute
best in separation and imaging. Rated for 250W nominal they
are enough to drive even the most demanding loudspeakers
with ease. Low distortion and very quiet they will deliver all
music types exactly as the artist originally intended!
The resultant performance achieved by this unit is among the
best in the world. It has excellent signal to noise ratio, low
distortion, wide bandwidth, huge dynamic range,
extraordinary resolution and fine detail.
INSTALLATION
Position the KW250S on a stable, horizontal surface where
there is no risk of it being knocked, or subjected to vibration
such as from loudspeakers.
Protect your KW250S from humidity - if the unit is moved
from a cold place to a warm room, or in generally humid
conditions, moisture can form on the pickup lens inside the
player, preventing the laser beam from reading the disc. If this
happens, remove the CD, close the disc drawer, and leave the
unit switched on for an hour or so to allow sufficient time for
the moisture to evaporate.
AERIAL (ANTENNA)
For ease of installation, a tri-band aerial is supplied with the
unit. This covers the FM, DAB II, III and L-bands and picks
up sufficient signal for most domestic purposes. However, if
FM stereo background noise is obtrusive, radio text is
corrupted or DAB cut-out is experienced, or unit is to be used
in a fringe area, a rooftop DAB and FM aerial may be
required. Please contact an approved aerial contractor with
good local knowledge.
The tri-band aerial is plugged into the tri-band antenna F
connector at the rear of the unit, and should be securely
fastened by tightening the nut.
AUDIO CONNECTIONS
Outputs: Connect your loudspeakers to the terminals on the
back panel marked as LEFT and RIGHT SPEAKER
outputs.
For ease of installation, a tri-band aerial is supplied with the
unit. This covers the FM, DAB II, III and L-bands and picks
up sufficient signal for most domestic purposes. However, if
FM stereo background noise is obtrusive, radio text is
corrupted or DAB cut-out is experienced, or unit is to be used
in a fringe area, a rooftop DAB and FM aerial may be
required. Please contact an approved aerial contractor with
good local knowledge.
The tri-band aerial is plugged into the tri-band antenna F
connector at the rear of the unit, and should be securely
fastened by tightening the nut.
AUDIO CONNECTIONS
Outputs: Connect your loudspeakers to the terminals on the
back panel marked as LEFT and RIGHT SPEAKER
outputs.
Preamp outputs phono sockets are controlled by the volume
and source controls. This allows connection of a second
amplifier for bi-amping or increased drive.
Tape outputs of nominal line level and are constant volume
for recording to tape, CD-R/RW, or any other recordable
format.
If desired, the unit can also be attached to an external DAC
of your choice. The unit outputs COAX and OPTICAL digital
signal stream at 48kHz.
NOTE: The digital output works for CD, DAB and FM.
Inputs: The KW250S has three line level inputs and a Phono
MM/MC input. PHONO MM/MC, AUX1 and AUX2 are
available at the back for other signal sources.
A Portable Device Input (PDI) 3.5mm stereo jack is provided
at the front which is shared with the AUX1 rear inputs. This
allows easy connection of a portable player.
Two digital inputs AUX 1 (optical and coax.), AUX 2 (coax
only), cater for digital sources that would benefit from the
KW250S‘s up to date DAC circuits. Use these inputs for
better quality from mini disc, DAT or MP3, for enhanced
sound quality.
NOTES ON USING COMPACT DISCS
Always hold discs by the edges and make sure they remain
clean - do not touch the surface. Keep discs away from direct
sunlight and heat sources, such as radiators. Clean discs with
a cloth before playing them, but do not use solvents such as
benzene, thinners, or antistatic spray intended for analogue
records.
After playing, always return the disc to its case for storage.
CLEANING
Before cleaning the unit, switch off power at the mains
switch and remove the mains plug from the wall socket.
Clean the cabinet and remote control unit using a moist cloth.
We do not advise using solvents, white spirit or thinners as
they could damage the surface finish.
and source controls. This allows connection of a second
amplifier for bi-amping or increased drive.
Tape outputs of nominal line level and are constant volume
for recording to tape, CD-R/RW, or any other recordable
format.
If desired, the unit can also be attached to an external DAC
of your choice. The unit outputs COAX and OPTICAL digital
signal stream at 48kHz.
NOTE: The digital output works for CD, DAB and FM.
Inputs: The KW250S has three line level inputs and a Phono
MM/MC input. PHONO MM/MC, AUX1 and AUX2 are
available at the back for other signal sources.
A Portable Device Input (PDI) 3.5mm stereo jack is provided
at the front which is shared with the AUX1 rear inputs. This
allows easy connection of a portable player.
Two digital inputs AUX 1 (optical and coax.), AUX 2 (coax
only), cater for digital sources that would benefit from the
KW250S‘s up to date DAC circuits. Use these inputs for
better quality from mini disc, DAT or MP3, for enhanced
sound quality.
NOTES ON USING COMPACT DISCS
Always hold discs by the edges and make sure they remain
clean - do not touch the surface. Keep discs away from direct
sunlight and heat sources, such as radiators. Clean discs with
a cloth before playing them, but do not use solvents such as
benzene, thinners, or antistatic spray intended for analogue
records.
After playing, always return the disc to its case for storage.
CLEANING
Before cleaning the unit, switch off power at the mains
switch and remove the mains plug from the wall socket.
Clean the cabinet and remote control unit using a moist cloth.
We do not advise using solvents, white spirit or thinners as
they could damage the surface finish.