Musical Fidelity X-AS100 Manual de usuario
Instructions For Use. Page 1
X-AS100
POWER AMPLIFIER
INSTRUCTIONS FOR USE
Thank you for purchasing the Musical Fidelity
X-AS100 Power Amplifier. Used properly and
carefully, it should give you many years of outstanding
musical reproduction.
Aesthetically and electronically the X-AS100 matches
perfectly with the X-P100 Preamplifier, X-RAY CD player
and X-PLORA tuner. Together, they form one of the
finest hi-fi systems available.
The X-AS100 has been designed to be switched on
continuously. The PSU should be positioned as far
away from the X-AS100 as possible. We suggest that the
PSU is placed on the floor near the mains outlet.
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 anything in your
audio system, please consult your dealer who is there
to help and advise you.
Instructions For Use. Page 2
X-AS100
PLEASE READ
IMPORTANT!
This unit is supplied in the UK with a mains lead fitted with a moulded 13 amp
plug. If, for any reason, you need to cut off this plug, please observe the following
safety precautions. Please dispose of the cut-off plug safely. It must not be plugged
into a mains power supply.
The wires in the mains lead supplied with this appliance are coloured in ac-
cordance with the following code:
Green and yellow..............Earth
Blue...............................Neutral
Brown................................Live
WARNING - This appliance must be earthed
As the colours of the wires of the mains lead of this appliance may not corre-
spond 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 termi-
nal 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 10 amp fuse must be used.
WARNING - Speaker Terminals
In order to comply with BSEN60-065 safety regulations, the 4mm. banana plug
holes have been fitted with plastic blanking pieces. Removal of these will invalidate
any safety approval of this unit.
WARNING - Radio Frequency Interference (RFI)
This hi-fi product has been tested to ensure that its operation will not be ad-
versely affected by normal background levels of RFI. It is possible that if this prod-
uct is subjected to abnormally high levels of RFI the unit may be susceptible and not
perform as expected. In the unlikely event of this happening on a regular basis,
please contact Musical Fidelity's service department.
The unit has also been tested to ensure that it does not radiate excessive levels
of RFI that could affect other pieces of electronic or electrical equipment.
The electronics in modern hi-fi equipment is complex and hence may be dam-
aged by lightning. It is possible that during electrical storms the operation of some
equipment may be adversely affected. For complete protection of your hi-fi system
during such storms, mains plugs and aerial leads should be disconnected.
Always ensure that when disconnecting and reconnecting your hi-fi equipment the mains
supply is switched off.
Instructions For Use. Page 3
X-AS100
CONNECTIONS AND FACILITIES
89 10 11
34 5 6 7
BACK VIEW
3Right channel input
4Right channel loop output
5Mono / Stereo button
6Left channel input
7Left channel loop output
8Right loudspeaker output
9Right PSU input
10 Left PSU input
11 Left loudspeaker output
FRONT VIEW
1Left channel power indicator
2Right channel power indicator
12
Instructions For Use. Page 4
X-AS100
INSTALLATION
INSTALLATION PRECAUTIONS
Your new X-AS100 is designed and built to provide trouble-free performance but as
with all electronic devices it is necessary to observe a few precautions. Please ensure
that you have complied with them before you connect any AC power to your ampli-
fier. Retain this guide for future reference.
þHeed all warnings on the back of
the unit.
þþ Place your X-AS100 where there
is adequate ventilation.
þþ Only connect the unit to a power
supply of the type marked on the back
of the unit.
þþ Position the power supply lead
and signal interconnect leads where
they are not likely to be walked on or
trapped by items placed on them.
ýý Do not use near water.
ýý Do not place the amplifier near
direct heat sources such as radiators
or other equipment that produces
heat.
ýý Do not remove any covers or try
to gain access to the inside. The war-
ranty will be invalid if the unit has
been tampered with. There are no
user adjustments within. Refer all
service work to an authorised Musical
Fidelity agent.
ýý There are fuses in the X-AS100.
In the unlikely event that one blows,
take your X-AS100 to your audio
dealer. Do NOT try to replace the fuse
yourself or you will invalidate the
warranty.
BEFORE YOU SWITCH ON
You should make all connections to the X-AS100 before switching on.
Follow this routine before you listen for the first time, and each time you change any
connections.
1Check all the inputs and outputs to the X-AS100.
2Then check again.
3Turn the volume control to nil.
4Now you can switch on the power and carefully advance the volume to
the level you want and enjoy the music.
Instructions For Use. Page 5
X-AS100
LOUDSPEAKERS
To get a realistic soundstage and full dynamic range from your X-AS100, use it with
loudspeakers of a reasonable efficiency. An average rating for a loudspeaker these days is
about 88dB. This should mean that for an input of 1 watt, measured at 1 metre distance,
the sound pressure output will be 88dB. This is the minimum efficiency that we recommend
you should use. However, in our opinion, even this is not enough to allow for an adequate
dynamic range. For proper realistic dynamic range we recommend a loudspeaker efficiency
of about 94-95dB such as the Kelly Transducers range. These are an ideal match for the
X-AS100 and are highly recommended.
CONNECTIONS
All connections should be made with the power OFF before the mains lead is
plugged in and the unit switched on.
The X-AS100 is a stereo amplifier which can if required be mono'd for use in passive
bi-amping systems.
The X-AS100 can be used with a preamplifier or any line level source which has a
volume control. We highly recommend the matching X-P100 or Nu-Vista Preamps avail-
able from Musical Fidelity as an excellent choice.
How to connect your X-AS100 for Normal Stereo use
Connect the Left and Right outputs from your pre-amp or other line level source to
the phono inputs on the back panel marked as Left and Right Line Inputs. For the best
results we recommend that you use Musical Fidelity X-LINX "no-nonsense" interconnect
cables for this connection.
Connect your loudspeakers to the loudspeaker terminals situated on the back panel
marked as Left and Right Loudspeaker Outputs. Please refer to diagram below.
Once these connections are made, plug in the IEC type mains lead and switch on the
unit.
Right Speaker Left Speaker
To Preamp
Right output To Preamp
Left output
CONNECTIONS
Instructions For Use. Page 6
X-AS100
PASSIVE BI-AMPING
The X-AS100 has both 'Loop Out' connections and a Mono/Stereo button to allow
flexible use in various Bi-amping combinations. In these combinations the X-AS100 is used
in conjunction with either another X-AS100 or compatible amplifiers with a gain of 33
such as the X-A50 or X-A200 monoblocs from Musical Fidelity. A pair of bi-wireable
speakers is required (and the bi-wire links must be removed) so that one amplifer channel
can drive the treble unit (tweeter) and another channel can drive the bass unit (woofer).
Please refer to the two examples below.
Example 1. Two X-AS100s
In this example, one X-AS100 is used to drive the left speaker whilst a second
X-AS100 drives the right speaker.
The Right output of your preamp is connected to the first X-AS100 to either the Left
or Right Line Input (it does not matter which). The Mono/Stereo Button is then
pressed in for Mono operation. The Right Louspeaker output is now wired to the Bass
unit terminals of the first speaker with a normal speaker wire pair. The Left Loudspeaker
output is now wired to the Treble unit terminals of the first speaker, again, using a normal
pair of speaker wires. This process is now repeated for the other X-AS100. Again the
Mono/Stereo button must be pressed in for mono operation. The Left output of the
preamp is connected to either of the Line level inputs of the second X-AS100. Then as
before one channel of the X-AS100 drives the bass unit of the second speaker and the
other channel drives the treble unit. See diagram below:
CONNECTIONS
Right Speaker
Left Speaker
To Preamp
Left line output
To Preamp
Right line output
Mono buttons 'IN'
for mono operation.
Speaker Bi-Wire
links removed.
Instructions For Use. Page 7
X-AS100
Example 2. One X-AS100 with a pair of X-A50s or X-A200s
In our second example, a pair of X-A200s are used to drive the bass unit (woofer) of
each channel whilst an X-AS100 is used to drive the treble unit (tweeter) of each channel.
The X-AS100 is connected to a preamp in the normal way with a pair of phono leads. Then
the line input of each X-A200 (or X-A50) is connected to a 'Loop Out' of the X-AS100 with
another set of phono leads.The X-AS100's Mono/Stereo button must be out for stereo
operation. The X-A200s in this example drive the left and right bass units whilst the
X-AS100 drives the left and right tweeter.
CONNECTIONS
If you have any questions regarding passive bi-amping please contact your authorised
Musical Fidelity dealer who should be able to help and advise you.
EXTERNAL POWER SUPPLY
We recommend that the Power Supply Unit be positioned on the floor as far away
from the X-AS100 as possible. This ensures that there is no magnetic interaction between
the X-AS100 and the power supply unit thus giving best performance.
The X-AS100 has been designed so that it may be left switched on indefinately if
desired.
WARNING - Heat
When in use the X-AS100 gives off heat from its casework.
Never put anything on top of your X-AS100.
Always ensure that the unit has adequate ventilation.
Right Speaker Left Speaker
To Preamp
Left line output
To Preamp
Right line output
Mono/Stereo button 'out'
for Stereo operation
Instructions For Use. Page 8
X-AS100
TROUBLESHOOTING
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 X-AS100 yourself, as this will
invalidate the guarantee.
Basic troubleshooting of an amplifier is similar to troubleshooting of 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 Probable Cause Remedy
No power when POWER
is pressed Mains plug not inserted
correctly Plug in securely
PSU unit not connected
to main unit Plug PSU umbilical lead
into back of main
X-AS100 unit
No sound Volume control is set
to minimum on Preamplifier Turn up the volume
Mute is selected on
Preamplifier Press mute button on
remote control
Preamplifier not connected
to Power amplifier Check phono cable
connection between units
Speakers are not connected,
or are connected incorrectly Check speaker cables
Sound is not precise,
lacking in bass and
stereo image
Speakers are connected
out of phase Make sure that both
speakers are connected
correctly
Instructions For Use. Page 9
X-AS100
SPECIFICATIONS
Musical Fidelity reserves the right to make improvements which may result in specification or
feature changes without notice.
X-AS100 POWER AMPLIFIER
Power output 100 watts per channel, 8Ω
THD < 0.005% at 1kHz
< 0.04% 20Hz - 20kHz unweighted
< 0.003% 20Hz - 20kHz 'A' weighted
Frequency response 10Hz - 70kHz +1dB
Input sensitivity 900mV
S/N ratio > 106dB unweighted (ref 100W)
> 117dB ‘A’ weighted (ref 100W)
> 86dB unweighted (ref 1W)
> 97dB 'A' weighted (ref 1W)
Channel separation > 90dB 20Hz-20kHz
Power consumption 450 watts (maximum)
Dimensions 230 x 110 x 330mm (W x H x D)
Width and height include feet,
depth include terminals
Standard accessories X-AS100 power supply unit
IEC type mains lead
X-AS100-98-1
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