Musical Fidelity Stereo Amplifier KW 500 User Manual

DUAL MONO INTEGRATED AMPLIFIER  
INSTRUCTIONS FOR USE  
Thank you for purchasing the Musical Fidelity kW500 Integrated amplifier.  
Used properly and carefully, it should give you many years of outstanding  
musical reproduction.  
Dust regularly with a soft cloth 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.  
Issue 2: Sept 2004  
kW 500 Integrated Amplifier  
Instructions for use Page 1 of 10  
 
GENERAL ADVICE  
INSTALLATION PRECAUTIONS and USER INFORMATION  
Your new kW 500 Integrated amplifier is designed and built to provide trouble-free perform-  
ance, 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 kW 500 Integrated amplifier 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 amplifier, for example, flower  
vases or potted plants. If water does spill inside, immediately pull out 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 amplifier is dangerous, and may cause electric shock or fire hazard.  
Do not place the unit near heat sources such as radiators, direct sunlight or other equipment.  
The case of this amplifier can run at high temperatures - operate the unit in a well ventilated  
area, and do not touch the cabinet sides or top after periods of use at high output power.  
Do not remove covers or try to gain access to the inside. There are no internal user adjust-  
ments 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 claims.  
Dust regularly with a soft duster 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 kW 500 Integrated amplifier  
please quote the serial number located on the rear panel of the unit.  
RADIO FREQUENCY INTERFERENCE (R.F.I)  
This product has been tested to ensure that its operation is not adversely affected by normal  
background levels of R.F.I., and that it does not itself generate excessive amounts of interfer-  
ence. However, if a problem persists, please contact your Musical Fidelity agent.  
Issue 2: Sept 2004  
kW 500 Integrated Amplifier  
Instructions for use Page 3 of 10  
 
CONNECTIONS AND FACILITIES - MAIN UNIT  
7
8
9
10  
1
1
2
3
4
5
6
Main unit front panel layout  
Main unit back panel layout  
1
2
Illuminated feet with multi-colour  
11 Right SPEAKER output  
terminals (two pairs)  
indicator LEDs for power and mute  
TAPE MONITOR selector button  
and LED  
PHONO input selector button and LED  
CD input selector button and LED  
Volume control  
SACD input selector button and LED  
TUNER input selector button and LED  
Infra red receiver for remote control  
AUXiliary input selector button and  
LED  
12 PRE-amplifier OUTput sockets  
13 TAPE RECord output sockets  
14 TAPE input sockets  
15 AUXiliary input sockets  
16 TUNER input sockets  
17 SACD input sockets  
18 CD input sockets  
19 PHONO input sockets  
20 Left SPEAKER output  
terminals (two pairs)  
3
4
5
6
7
8
9
10 TAPE input selector button and LED  
21 Amplifier power inlet socket  
- right channel  
22 Pre-amplifier power inlet socket  
23 Phono earth terminal  
24 Amplifier power inlet socket  
- left channel  
11  
12  
13  
14  
15  
16  
17  
18  
19  
20  
21  
22  
23  
24  
Issue 2: Sept 2004  
kW 500 Integrated Amplifier  
Instructions for use Page 4 of 10  
 
CONNECTIONS AND FACILITIES - POWER SUPPLY  
Power LED (blue)  
Mains on / off  
push switch  
Power supply unit back panel layout  
1
2
3
4
5
6
7
Right power amplifier PSU output  
Pre-amplifier PSU output  
Left power amplifier PSU output  
Right power amplifier PSU fuse  
Pre-amplifier PSU fuse  
Left power amplifier PSU fuse  
Mains inlet - 16 Amp IEC type  
1
2
3
FOR USE ONLY  
WITH MUSICAL  
FIDELITY  
KW 500  
4
5
6
7
Issue 2: Sept 2004  
kW 500 Integrated Amplifier  
Instructions for use Page 5 of 10  
 
REMOTE CONTROL  
REMOTE CONTROL  
The blue buttons on the remote control enable main functions of the amplifier to be operated  
from a convenient distance. Remaining buttons on this universal handset are for use with other  
Musical Fidelity products, and have no effect on the kW 500 Integrated amplifier.  
Equivalent buttons on the remote handset have the same functions as those on the front panel of  
the unit.  
As the remote control uses an invisible infra-red light beam, the transmitter must be pointed  
directly towards the receiver window on the front of the amplifier, without visual obstruction  
between them.  
Pressing the volume-up or -down buttons on the remote handset will turn the motorised volume  
control in the required direction.  
The MUTE button mutes the SPEAKER output and PRE-OUT sockets. To show that the  
amplifier is muted, the LEDs in the feet will change from their current colour to red. Press the  
MUTE button again to cancel mute function, and the feet LEDs will revert to their previous  
colour (see page 8, under “Starting”).  
If the range of the remote control greatly decreases, replace the batteries with new ones.  
Do not mix old and new batteries - two are required, type SUM-4, AAA or LR03. Do not  
dispose of used batteries in a fire.  
SACD input select  
TUNER  
input select  
PHONO pickup  
input select  
CD input select  
VOLUME (Up)  
VOLUME (Down)  
TAPE input select  
AUXiliary  
MUTE button  
input select  
Issue 2: Sept 2004  
kW 500 Integrated Amplifier  
Instructions for use Page 6 of 10  
 
CONNECTIONS  
PRE-AMPLIFIER OUTPUT  
All input, output and power connections  
should be made with the mains power  
switched OFF.  
The kW 500 Integrated amplifier has its  
pre-amplifier output available from RCA  
sockets on the back panel marked PRE-  
OUT, and is controlled by the volume  
adjustment.  
INPUT CONNECTIONS  
The kW 500 Integrated amplifier has a pair  
of phono inputs for moving magnet (MM)  
pickups.  
This is to allow “bi-amplification” using  
suitable external amplifiers and crossover  
networks to power the speaker drive com-  
ponents separately, giving noticeable  
improvement in clarity, imaging and bass  
weight.  
Some turntable/pickup arm combinations  
are fitted with an extra wire for chassis  
earthing. This should be connected to the  
earth terminal on the back panel.  
In this arrangement, typically the kW 500’s  
speaker outputs are used to drive the speak-  
er’s “tweeter” (high audio frequencies), and  
an external stereo amplifier drives the  
“woofer” (low frequencies).  
The kW 500’s PRE OUT RCA sockets  
would therefore be connected to the input  
of the external “woofer” amplifier in this  
example.  
The kW 500 also has five “line level”  
inputs which are electrically identical, and  
therefore suitable for use with any source  
component having an output of at least  
300mV. The sockets on the rear panel are  
marked CD, SACD, TUNER, AUXiliary,  
and TAPE, to correspond with function  
buttons on the front panel.  
If you are in doubt about bi-amplification,  
please contact your dealer for advice.  
Using good quality co-axial audio leads,  
connect the left and right outputs from  
your CD player, tuner or phono/record  
deck to the appropriate RCA input sockets  
on the back panel.  
BEFORE SWITCHING ON  
Connect the two accessory power supply  
leads into the RIGHT and LEFT PSU  
(Power Supply Unit) INPUT sockets at the  
rear of the amplifier. The other ends of the  
leads plug into corresponding marked sock-  
ets on the back panel of the power supply  
unit.  
Connect the kW 500’s TAPE input sockets  
to the line output of your tape recorder,  
and kW 500’s TAPE RECORD output  
sockets to the line input sockets of the tape  
deck.  
OUTPUT CONNECTIONS  
A single lead with smaller plugs connects  
between the PRE-AMP PSU sockets on  
each unit.  
Connect your loudspeakers to the terminals  
on the back panel marked as LEFT and  
RIGHT SPEAKER outputs.  
Plug the accessory IEC mains lead into the  
rear PSU mains socket, then the other end  
into a wall outlet. Turn the volume control  
on the front panel to low (anticlockwise).  
Issue 2: Sept 2004  
kW 500 Integrated Amplifier  
Instructions for use Page 7 of 10  
 
OPERATION  
STARTING . . . .  
TAPE RECORDING  
Press the POWER button on the front panel  
of the kW 500 power supply unit. The blue  
LED above the button should now light.  
To record, simply select the required source  
with the input selector button on the front  
panel or remote control. This source will  
now be routed to the kW 500’s TAPE  
RECORD output for recording by the  
external tape deck. You will also be able to  
hear the selected source through the loud-  
speakers.  
The LEDs in the feet of the amplifier unit  
will light red for about fifteen seconds indi-  
cating that all audio outputs from the unit  
are muted. Feet illumination then fades  
over approximately fifteen seconds to  
amber, indicating that output is no longer  
muted, and that your kW 500 amplifier is  
now ready for use. However, after a further  
period of about 35 minutes, the colour fades  
to blue, confirming that the amplifier has  
fully warmed up.  
Note - adjustment of the volume control has  
no effect on the recording level.  
OFF TAPE MONITORING  
The kW 500 Integrated amplifier has a sin-  
gle tape circuit with facility for off-tape  
monitoring with 3-head tape decks.  
Unless using your amplifier for off-tape  
monitoring (see paragraph opposite  
ensure that the TAPE MONITOR button  
has not been pressed accidently, as other-  
wise no sound will be heard through the  
speakers.  
)
In conjunction with a 3-head cassette deck,  
off-tape monitoring allows the user to com-  
pare recorded sound with the original whilst  
a recording is being made. To do this, first  
select the required source in the normal way  
and start recording.  
Select the required audio input source by  
pressing an appropriate function button on  
the front panel, or remote control. Now  
adjust the volume control to obtain the pre-  
ferred sound level.  
The TAPE MONITOR button on the front  
panel can now be used to switch between  
the original source sound and the recorded  
version, allowing direct comparison.  
OVERLOAD PROTECTION  
On some 3-head tape decks there is an addi-  
tional ‘tape/source’ switch, which must be  
in the ‘tape’ position for the above to work.  
If for any reason, speaker output power of  
your kW 500 is excessive, for example at  
very high volume setting or due to wrong  
load impedance, an overload protection cir-  
cuit is activated. The motorised volume  
control will be turned down automatically,  
and the four illuminated feet will change  
colour to violet for about five seconds, or  
until the problem is removed.  
If in doubt, please refer to your tape deck  
operating manual.  
Issue 2: Sept 2004  
kW 500 Integrated Amplifier  
Instructions for use Page 8 of 10  
 
TROUBLESHOOTING  
Basic problem-solving with an amplifier is similar to troubleshooting any other electrical or  
electronic equipment. Always check the most obvious possible causes first. To give you a few  
ideas of what to look for, check the following:  
Problem  
Possible Cause  
Remedy  
No power when POWER  
button is pressed  
Mains plug not inserted  
fully into rear socket  
Plug in securely  
No sound  
Tape monitor function has  
been selected  
Switch off tape monitor  
Mute funtion is still active  
(feet LEDs are still red)  
Press the mute button  
again to cancel  
Wrong connections between  
input sources and the kW 500  
amplifier  
Check audio input lead  
connections  
Speakers not connected, or  
incorrectly wired  
Check speaker cables  
Sound is not precise, lacking Speakers are connected out of  
Ensure speakers are  
connected correctly  
in bass and stereo image  
phase, i.e., connections to one  
speaker (+ and -) are reversed  
If none of these actions effect a cure, please contact your dealer, or an authorised Musical  
Fidelity service agent. Remember, never open the case of the kW 500 Integrated amplifier  
yourself, as this will invalidate the guarantee.  
Issue 2: Sept 2004  
kW 500 Integrated Amplifier  
Instructions for use Page 9 of 10  
 
kW 500  
Dual Mono Integrated Amplifier  
SPECIFICATIONS :  
Output:  
Voltage RMS:  
Voltage peak to peak:  
Power:  
63.9 Volts 20Hz to 20kHz  
180.6 Volts  
510 Watts per channel into 8 Ohms (27dBW),  
770 Watts per channel into 4 Ohms  
Peak-to-peak output current:  
Damping factor:  
160 Amps  
> 200  
Output devices per channel:  
Pre-output impedance:  
8
50 Ohms  
Line inputs:  
Harmonic distortion at 1kHz  
< 0.002% up to 90% power into 4 or 8 Ohms  
Total harmonic distortion + noise, 20Hz to 20kHz < 0.007%  
Signal / noise ratio  
> 102dB ‘A-weighted  
Input sensitivity for 350 Watts into 8 Ohms  
Input impedance  
330mV  
220K Ohms  
Overload margin  
36dB  
Channel separation  
Frequency response  
> 70dB 20Hz to 20kHz  
20Hz to 20kHz, +0, -0.0dB  
20Hz to 60kHz, +0, -1.2dB  
Phono input:  
20  
15  
10  
5
Frequency response reference  
IEC RIAA - see graph....  
RIAA RESPONSE  
dB  
0
RIAA  
PHONO  
RIAA/IEC  
-5  
-10  
-15  
-20  
16  
32  
63  
125  
250  
500 1.2K 2.5K  
FREQUENCY  
5K  
10K  
20K  
Signal / noise ratio  
Input sensitivity  
Input impedance  
Overload margin  
> 96dB A-weighted  
2.5mV (moving magnet)  
47k Ohms  
29dB  
Power requirement:  
100 / 115 / 230Volts AC 50 / 60Hz (factory pre-set),  
1950 Watts maximum into 8 Ohms  
Inputs: 5 pairs line level RCA connectors,  
Outputs:  
2 amplifier channels via 2 pairs per  
channel binding posts.  
1 pair phono (moving magnet) RCA connectors  
1 pair RCA audio pre-outputs controlled by  
the volume setting  
1 pair RCA tape record fixed line level output  
Weight, main unit: 26.8 kg, 59 lbs unit only, unboxed  
Dimensions, main  
483 mm, 19 inches wide  
31.8 kg, 70.1 lbs in shipping carton  
unit:  
167 mm, 6.6 inches high including feet  
470 mm, 18.5 inches deep including terminals  
P.S.U: 18.3 kg, 40.3 lbs unit only, unboxed  
21.3 kg, 47 lbs in shipping carton  
P.S.U: 364 mm, 14.4 inches wide  
167 mm, 6.6 inches high including feet  
278 mm, 11 inches deep including rear sockets  
Standard accessories:  
IEC type mains lead,  
Power supply leads, main (two)  
Power supply lead for pre-amplifier  
Remote control (universal type)  
Two batteries (type SUM-4, AAA, LR03)  
Musical Fidelity reserves the right to make improvements which  
may result in specification or feature changes without notice  
Issue 2: Sept 2004  
kW 500 Integrated Amplifier  
Instructions for use Page 10 of 10  
 

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