Musical Fidelity KW250S User Manual
KW250S
INSTRUCTIONS FOR USE
Thank you for purchasing the Musical Fidelity KW250S
This model uses the very latest DAB/FM radio text receiver, top quality CD transport, ultra low jitter 24 Bit
DAC technology and further jitter reduction techniques to achieve both an excellent technical specification
and unparalleled DAB/FM/CD sound quality. This is complimented with a top quality 6922 tube line level
preamplifier stage and two monobloc power amps capable of driving over 250W.
The KW250S is a perfect answer to most hi-fi requirements in a single, beautifully engineered package.
Used properly and carefully, it should give many years of outstanding musical reproduction.
Dust regularly with a soft duster or soft brush, but be careful when using cleaning or polishing agents - they
may harm the surface finish.
If you have any questions about your audio system,
Please consult your dealer who is there to help and advise.
KW250S
CONTENTS
PAGE
3 Safety information :
4, 5 Safety information :
6 General advice :
7 General advice :
8 Facilities and connections :
9 Remote control :
- - Mains plug (U.K. only)
Modification warning
-
Laser product labelling
-
Laser type
-
Radio-frequency interference
- - Installation precautions
User information
-
Introduction
-
Installation
-
Aerial
-
Audio connection
-
Notes on using compact discs
-
Cleaning
- Illustrations - front and rear panels
- Operation and illustration
10 CD basic operation
11, 12 CD special features
13 CD problems?
14, 15 DAB button functions
16 FM function buttons
17 Tuner problems?
18 Amplifier connections
19, 20 Amplifier operation
21 Amplifier problems?
- Loading, playback, and track selection
- Repeat, shuffle, scan, programming
- Basic CD player fault finding
- Band, auto tune, manual tune, presets, info.
menu
- Auto tune, band, manual tune, presets,
mono/stereo, info. menu
- Basic tuner fault finding
- Input connections, output connections
- Phono, CD, Tuner, AUX1, AUX2, recording
- Basic Amplifier fault finding
22 CD, DAC and tuner specifications
23 Pre & Power amplifier specifications
24 Manual history
Issue 2: 19th June 2006
Page 2 of 24
KW250S
SAFETY INFORMATION
IMPORTANT
This unit is supplied in the U.K. with mains lead fitted with a moulded 13 amp plug. If, for any reason, you need to cut off the
plug, please remove the fuse holder and dispose of the plug safely, out of reach of children. It must not be plugged into a mains
outlet.
The wires in the mains lead supplied with this appliance are coloured in accordance with the following code:
WARNING - This appliance MUST be earthed
As the colours of the wires of the mains lead of this appliance may not correspond with the
coloured markings identifying the terminals in your plug, proceed as follows:
The wire which is coloured green-and-yellow must be connected to the terminal in the plug which is marked with the letter E or
coloured green or green-and-yellow, or by the earth symbol :
The wire which is coloured brown must be connected to the terminal which is marked with the letter L or coloured red.
The wire which is coloured blue must be connected to the terminal which is marked with the letter N or coloured black.
If connecting to a BS1363 plug, a 13 amp fuse must be used.
! (U.K. only)
Green and yellow..............Earth
Blue................................Neutral
Brown.................................Live
WARNING:
ANY MODIFICATIONS TO THIS PRODUCT NOT EXPRESSLY APPROVED
BY MUSICAL FIDELITY WHO IS THE PARTY RESPONSIBLE FO R
STANDARDS COMPLIANCE COULD VOID THE USER'S AUTHORITY TO
OPERATE THIS EQUIPMENT.
Issue 2: 19th June 2006
Page 3 of 24
KW250S
CLASS 1 LASER PRODUCT
SAFETY INFORMATION
The KW250S incorporates a CD player which has been designed and manufactured according to FDA regulations "title 21, CFR,
chapter 1, sub-chapter J, based on the Radiation Control for Health and Safety Act of 1968", and is classified as a Class 1 laser
product. There is no hazardous radiation during normal use because invisible radiation emitted inside this product is completely
confined within the protective housing. However you must observe the following important warnings:
CAUTION!
THIS CD PLAYER USES INVISIBLE LASER LIGHT. WHEN THE PLAYER OPERATES, LASER LIGHT IS
RADIATED INTERNALLY . DO NOT REMOVE THE PROTECTIVE HOUSINGS .
USE OF CONTROLS OR ADJUSTMENTS OR PERFORMANCE OF PROCEDURES OTHER THAN THOSE
SPECIFIED HEREIN MAY RESU LT IN HAZARDOUS RADIATION EXPOSURE CAUSING EYE INJURY.
IF THIS PRODUCT D EVELOPS A FAULT, PLEASE CONTACT YOUR AUTHORISED MUSICAL FIDELITY
SERVICE AGENT. DO NOT ATTEMPT TO SERVICE IT YOUR-SELF AND DO NOT CONTINUE TO USE THIS
PRODUCT IN A FAULTY STATE.
REAR PANEL :
CAUTION!
CLASS 1
LASER
PRODUCT
INTERNAL LASER WARNING LABELS
CAUTION - INVISIBLE LASER RADIATION WHEN OPEN AND
INTERLOCKS DEFEATED. AVOID EXPOSURE TO BEAM.
VORSICH! - UNSICHTBARE LASERSTRAHLUNG TRITT AUS,
WENN DECKEL GEÖFFNET UND WENN
SICHERHEITSVERRIEGELUNG ÖBERBRÖCT IST.
NICHT DEM STRAHL AUSSETZEN!
VARNING - OSYNLIG LASERSTRALNING NÄR DENNA DEL
AR ÖPPNAD OCH SPÄRR ÄR URKOPPLAD.
STRALEN AL FARLIG.
ADVARSEL - USYNLIG LASERSTRAKING VED ABNING, NAR
SIKKERHEDSAFBRYDEREER UDE AF FUNCTION UNDGA
UDSÆTTELSE FOR STRALING.
VAROITUSI - SUOJAKOTELOA EI SAA AVATA LAITE SISÄLTÄÄ
LASERDIODIN, JOKA LAHETTÄÄ (NAKYMATONTA)
SILMILLE VAARALLISTA LASERSATEILYA.
THIS PRODUCT COMPLIES WITH DHHS RULES 21 CFR, CHAPTER 1,
SUBCHAPTER J, PART 1040 AT DATE OF MANUFACTURE.
THIS PRODUCT COMPLIES WITH PART 15 OF THE FCC RULES. OPERATION
IS SUBJECT TO TWO CO NDITIONS:
1. THIS DEVICE MAY NOT CAUSE HARMFUL INTERFERENCE, AND
2. THIS DEVICE MUST ACCEPT ANY INTERFERENCE RECEIV ED,
INCLUDING INTERFERENCE THAT MAY CAUSE UNDESIRED OPERATION.
Issue 2: 19th June 2006
Page 4 of 24
KW250S
This equipment uses and can radiate radio frequency energy, and if not installed and operated in accordance with the instructions,
may cause interference to radio communications.
However, it is designed to radiate minimal levels of RFI, and accordingly been testing to North American standards (FCC
regulations - limits for a class B digital device pursuant to part 15 of the rules). These requirements are intended to provide
reasonable protection against excessive interference in a residential installation.
Conversely, the product has also been checked to ensure that its own operation is not adversely affected by normal background
levels of RFI received externally.
However, if interference is experienced, for instance to radio or TV broadcasts, the user is recommended to try one or more of the
following measures:
• Identify the source of interference by turning off power to the CD player or other equipment individually, and checking
whether the problem disappears.
• Re-orientate or relocate the receiving aerial.
• Move the CD player away from the receiver.
• Connect the CD player to a mains outlet on a different circuit from the receiver.
• Consult a dealer or experienced TV/radio technician for help.
If a problem persists, please contact Musical Fidelity's service department.
LASER INFORMATION:
Manufacturer : Sharp
Optical pick-up :
RADIO - FREQUENCY INTERFERENCE (RFI)
Pick-up type : GH6C005B
Wavelength : 780nm
SAFETY INFORMATION
Issue 2: 19th June 2006
Page 5 of 24
KW250S
GENERAL INSTALLATION
INSTALLATION PRECAUTIONS and USER INFORMATION
Your new KW250S is designed and built to provide trouble-free performance, but as with all electronic devices it is necessary to
observe a few precautions:
Heed all warnings shown on the back of the product.
Only connect the KW250S to a mains outlet having the same voltage as marked at the back of the unit.
Always ensure that when disconnecting and reconnecting your audio equipment the mains supply is switched off.
Position the mains lead and signal interconnects where they are not likely to be walked on or trapped by items placed on
them.
Do not use near water, or place water-filled containers on the KW250S, for example, a flower vase or potted plants. If
water does spill inside, immediately pull o ut the mains plug from the wall socket and inform your dealer, who should then
check the unit before further use. Entry of liquid into the KW250S is dangerous, and may cause electric shock or fire
hazard.
Do not place the unit near direct heat sources such as radiators, direct sunlight or other equipment.
Do not remove any covers or try to gain access to the inside. There are no internal adjustments or fuses you can replace
yourself. Refer all service work to an authorised Musical Fidelity agent.
Note: Unauthorised opening of the equipment will invalidate any warranty claim.
Dust regularly with a soft cloth or soft brush but be careful when using cleaning or polishing agents - they may harm the
surface finish.
The electronics in modern hi-fi equipment is complex and may, therefore, be adversely affected or damaged by lightning. For
protection of your audio system during electrical storms, remove the mains plugs and disconnect any aerial lead.
If after-sales service is required, to help your dealer identify the KW250S please quote the serial number located on the rear panel
of the unit.
Issue 2: 19th June 2006
Page 6 of 24
KW250S
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 upsampled 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 dualdifferential 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.
GENERAL INSTALLATION
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.
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
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.
FM.
Issue 2: 19th June 2006
Page 7 of 24
KW250S
5 6 7 8 9
FRONT PANEL
1 2 3 4
FACILITIES AND CONNECTION
1. DAB/FM Tuning knob
2. DISPLAY (incorporates remote control IR receiver)
3. CD drawer
4. VOLUME knob
5. POWER mains on/off switch
10 11 12 13
6. CD function buttons
7. TUNER function buttons
8. AMPLIFIER function buttons
9. PDI (Portable Device Input), 3.5mm jack
connector
REAR PANEL
14 15 16 17 18
10. LOUDSPEAKER OUPUTS Right hand side
11. PRE & TAPE OUTPUTS
12. PHONO, AUX 1, AUX 2/PDI INPUTS
13. LOUDSPEAKER OUPUTS Left hand side
14. DIGITAL OUTPUTS RCA coaxial and optical
Issue 2: 19th June 2006
15. AUX 1, AUX 2 DIGITAL IN PUTS
RCA coaxial and optical
16. PHONO GROUNDING 4mm post
17. DAB/FM AERIAL SOCKET F-type
18. IEC MAINS INLET
Page 8 of 24
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