Musical Fidelity Stereo Amplifier X AS100 User Manual

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 1  
X-AS100  
 
CONNECTIONS AND FACILITIES  
1
2
FRONT VIEW  
BACK VIEW  
1
2
Left channel power indicator  
Right channel power indicator  
3
4
5
6
Right channel input  
Right channel loop output  
Mono / Stereo button  
Left channel input  
7
8
9
Left channel loop output  
Right loudspeaker output  
Right PSU input  
10  
11  
Left PSU input  
Left loudspeaker output  
3
4
5
6
7
8
9
10  
11  
Instructions For Use. Page 3  
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.  
þ
Heed all warnings on the back of  
ý
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Do not use near water.  
the unit.  
Do not place the amplifier near  
þ
Place your X-AS100 where there  
direct heat sources such as radiators  
or other equipment that produces  
heat.  
is adequate ventilation.  
þ
Only connect the unit to a power  
supply of the type marked on the back  
of the unit.  
ý
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.  
þ
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.  
ý
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.  
1
Check all the inputs and outputs to the X-AS100.  
Then check again.  
Turn the volume control to nil.  
Now you can switch on the power and carefully advance the volume to  
the level you want and enjoy the music.  
2
3
4
Instructions For Use. Page 4  
X-AS100  
 
CONNECTIONS  
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.  
To Preamp  
Left output  
To Preamp  
Right output  
Left Speaker  
Right Speaker  
Instructions For Use. Page 5  
X-AS100  
 
CONNECTIONS  
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:  
To Preamp  
Right line output  
Right Speaker  
Mono buttons 'IN'  
for mono operation.  
To Preamp  
Left line output  
Speaker Bi-Wire  
links removed.  
Left Speaker  
Instructions For Use. Page 6  
X-AS100  
 
CONNECTIONS  
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.  
To Preamp  
Left line output  
To Preamp  
Right line output  
Mono/Stereo button 'out'  
for Stereo operation  
Left Speaker  
Right Speaker  
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.  
Instructions For Use. Page 7  
X-AS100  
 
TROUBLESHOOTING  
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 Mains plug not inserted  
Plug in securely  
is pressed  
correctly  
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  
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.  
Instructions For Use. Page 8  
X-AS100  
 
SPECIFICATIONS  
X-AS100 POWER AMPLIFIER  
Power output  
THD  
100 watts per channel, 8W  
< 0.005% at 1kHz  
< 0.04% 20Hz - 20kHz unweighted  
< 0.003% 20Hz - 20kHz 'A' weighted  
10Hz - 70kHz +1dB  
Frequency response  
Input sensitivity  
S/N ratio  
900mV  
> 106dB unweighted (ref 100W)  
> 117dB ‘A’ weighted (ref 100W)  
> 86dB unweighted (ref 1W)  
> 97dB 'A' weighted (ref 1W)  
> 90dB 20Hz-20kHz  
Channel separation  
Power consumption  
Dimensions  
450 watts (maximum)  
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  
Musical Fidelity reserves the right to make improvements which may result in specification or  
feature changes without notice.  
Instructions For Use. Page 9  
X-AS100  
X-AS100-98-1  
 

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