Musical Fidelity Stereo Amplifier AMS50 User Manual

AMS50  
ANTONY MICHAELSON SIGNATURE  
50W Pure Class A Dual Mono Power Amplifier  
Thank you for purchasing the Musical Fidelity AMS50.  
The AMS50 uses the latest in low distortion circuitry in a bridged configuration which delivers 50 watts of pure class A power.  
The AMS50 is designed with pure undistorted experience in mind. Overall the listening experience is greatly improved because of  
dramatically lower distortion and increased dynamic range.  
The AMS50 accepts both XLR balanced and RCA line level inputs. When driven from a balanced pre-amplifier the sound  
quality is greatly improved because the balanced cable cancels out noise and interference artefacts, giving up to 12dB increase in  
dynamic range.  
The Primo Pre-amplifier is an ideal partner as it features a fully valve signal path and true balanced operation throughout  
Alternatively, the AMS50 can be used as a conventional power amplifier driven by a high quality preamp.  
The AMS50 is a perfect answer to pure musicality 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 there are further questions about any Musical Fidelity component, please consult the dealer from whom it was purchased, who is  
there to help and give advice.  
 
SAFETY INFORMATION  
AMS50  
IMPORTANT! (U.K. only)  
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:  
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 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.  
WARNING:  
ANY MODIFICATIONS TO THIS PRODUCT NOT EXPRESSLY APPROVED  
BY MUSICAL FIDELITY WHO IS THE PARTY RESPONSIBLE FOR  
STANDARDS COMPLIANCE COULD VOID THE USER'S AUTHORITY TO  
OPERATE THIS EQUIPMENT.  
Issue 1  
Page 3 of 12  
 
GENERAL ADVICE  
AMS50  
INSTALLATION PRECAUTIONS and USER INFORMATION  
Your new AMS50 is designed and built to provide trouble-free performance, but as with all electronic devices it is necessary to  
observe a few precautions:  
This unit features a BRIDGED speaker output and should NOT be grounded on either speaker output terminal as both  
terminals are effectively “hot”, i.e. carry signal. Please check if using any active “sub”, electrostatic, or other non standard  
potentially grounded speaker types directly connected to the outputs of the AMS50. Consult speaker manual or supplier if  
in doubt.  
Heed all warnings shown on the back of the product.  
Only connect the AMS50 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 AMS50, for example, a flower vase 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 AMS50 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 AMS50 please quote the serial number located on the rear panel of  
the unit.  
Issue 1  
Page 4 of 12  
 
ITEM DISPOSAL INFORMATION  
AMS50  
DISPOSAL  
AFVAL  
The crossed out wheeled bin label that appears on the  
back panel of the product indicates that the product must not be  
disposed of as normal household waste. To prevent possible harm  
to the environment please separate the product from other waste to  
ensure that it can be recycled in an environmentally safe manner.  
Please contact local government office or retailer for available  
collection facilities.  
Het label op de achterzijde van dit apparaat, een  
afvalbak op wielen met een kruis doorgehaald, geeft aan dat dit  
apparaat niet samen met gewoon huishoudafval mag worden  
weggegooid. Om mogelijke schade aan onze leefomgeving te  
voorkomen dient dit apparaat, gescheiden van gewoon  
huishoudelijk afval, te worden afgevoerd zodat het op een  
milieuvriendelijke manier kan worden gerecycled. Neem voor  
beschikbare inzamelplaatsen contact op met uw gemeentelijke  
reinigingsdienst of met uw elektronica leverancier.  
DISPOSITION  
La poubelle sur roulettes barrées X, qui apparaît en logo  
sur le panneau arrière du produit, indique que celui-ci ne doit pas  
être traité comme un déchet domestique commun. Afin de protéger  
l'environnement, ce produit électronique devra être géré  
séparément et donc recyclé selon les nouvelles normes  
Européennes Rohs concernant les déchets d'appareils électroniques.  
Prière de contacter les services concernés gouvernementaux ou  
votre point de vente pour l'élimination et l'enlèvement de déchets  
électroniques équipés de composants électroniques.  
HÄVITTÄMINEN  
Yliruksattua jäteastiaa kuvaava tarra tuotteen  
takalevyssä kertoo, että tuotetta ei saa käsitellä normaalina  
talousjätteenä. Ympäristön suojelemiseksi on tuote pidettävä  
erillään muusta jätteestä ja se on kierrätettävä ekologisesti  
kestävällä tavalla. Ota yhteyttä laitteen myyjään tai Pirkanmaan  
Ympäristökeskukseen lähimmän kierrätyskeskuksen löytämiseksi.  
AFSKAFNING  
DISPOSAL  
Logoet med en skraldespand med kryds over på bagsiden  
af apparatet indikerer at dette produkt ikke må kasseres som normal  
husholdningsaffald. For at forebygge mulig skade på miljøet, bedes  
De separere dette produkt fra andet affald, og sikre at det bliver  
genbrugt på en miljørigtig måde. Kontakt venligst de lokale  
myndigheder eller din forhandler for oplysning om nærmeste  
tilgængelige opsamlingssted for elektronikaffald.  
La etiqueta cruzada hacia fuera del compartimiento que  
aparece en el panel trasero del producto indica que el producto no  
se debe reciclarse como basura normal de la casa. Para prevenir  
daños posible al ambiente separe por favor el producto de otras  
basura para asegurarse de que puede ser reciclada de una manera  
ambientalmente segura. Entre en contacto por favor a su oficina  
gubernamental local o a su minorista para las instalaciones  
disponibles de la colección.  
∆ΙΑ∆ΙΚΑΣΙΑ ΑΠΟΡΡΙΨΗΣ  
ΤΟ  
ΤΡΟΧΗΛΑΤΟ ΚΑ∆Ο ΑΠΟΡΡΙΜΑΤΩΝ ΣΤΗΝ ΠΙΣΩ  
ΟΨΗ ΤΟΥ ΜΗΧΑΝΗΜΑΤΟΣ  
∆ΗΛΩΝΕΙ ΟΤΙ ΤΟ ΠΡΟΙΟΝ ΑΥΤΟ ∆ΕΝ ΠΡΕΠΕΙ ΝΑ  
∆ΙΑΧΕΙΡΙΣΘΕΙ ΣΑΝ ΣΥΝΗΘΙΣΜΕΝΟ ΟΙΚΙΑΚΟ ΑΠΟΒΛΗΤΟ.  
ΠΡΟΣ ΑΠΟΦΥΓΗ ΕΝ∆ΕΧΟΜΕΝΗΣ ΕΠΙΒΑΡΥΝΣΗΣ ΤΟΥ  
ΠΕΡΙΒΑΛΛΟΝΤΟΣ, ΞΕΧΩΡΙΣΤΕ ΤΟ ΠΡΟΙΟΝ ΑΠΟ ΤΑ  
ΑΛΛΑ  
ΣΗΜΑ  
ΜΕ  
ΤΟΝ  
∆ΙΑΓΕΓΡΑΜΜΕΝΟ  
RIFIUTI  
L'etichetta del cassonetto barrato riportato sul retro  
dell'apparecchio indica che il prodotto non deve essere smaltito  
tramite la procedura normale di smaltimento dei rifiuti domestici.  
Per evitare eventuali danni all'ambiente, separare questo prodotto  
da altri rifiuti domestici in modo che possa venire riciclato in base  
alle procedure di rispetto ambientale. Per maggiori dettagli  
sulle aree di raccolta disponibili, contattate l'ufficio govenativo  
locale od il rivenditore del prodotto.  
ΑΠΟΡΡΙΜΑΤΑ ΩΣΤΕ ΝΑ ΕΞΑΣΦΑΛΙΣΘΕΙ Η ΑΝΑΚΥΚΛΩΣΗ  
ΤΟΥ ΜΕ ΤΟΝ ΠΡΕΠΟΝΤΑ ΤΡΟΠΟ.  
ΠΑΡΑΚΑΛΟΥΜΕ ΝΑ ΕΠΙΚΟΙΝΩΝΗΣΕΤΕ ΜΕ ΤΗΝ ΤΟΠΙΚΗ  
FACHGERECHTE ENTSORGUNG:  
ΥΠΗΡΕΣΙΑ ΑΝΑΚΥΚΛΩΣΗΣ  
Η
ΜΕ ΤΟ ΚΑΤΑΣΤΗΜΑ  
Das auf der Geräterückseite angebrachte Label deutet  
darauf hin, dass das Produkt nicht mit konventionellem  
Hauskehricht entsorgt werden darf. Um Schäden und  
Verschmutzungen an Umwelt und Mensch zu vermeiden, muss das  
Produkt fachgerecht entsorgt und von anderem Abfall getrennt  
werden. Wenden Sie sich bei Fragen hierzu an Ihren Fachhändler  
oder an eine öffentliche Informationsstelle.  
ΑΓΟΡΑΣ ΓΙΑ ΠΕΡΙΣΣΟΤΕΡΕΣ ΛΕΠΤΟΜΕΡΕΙΕΣ.  
Issue 1  
Page 5 of 12  
 
INSTALLATION  
AMS50  
SETTING UP  
OUTPUTS:  
Position the AMS50 on a stable, horizontal surface  
where there is no risk of it being knocked.  
Make sure ALL units involved are switched off and  
unplugged from mains supply before making or  
removing any connections.  
Connect loudspeakers to the terminals near the base of  
the back panel marked as OUTPUTs. Make sure (+)  
lead from amplifier speaker output goes to (+) lead on  
speaker terminals, and (-) to (-). It is most important to  
get the phase of these leads correct.  
During normal use, a class A amplifier, such as the  
AMS50, develops an appreciable amount of internal  
heat. It should therefore be sensibly situated where it can  
radiate this heat most efficiently. If this is not realised,  
heat build-up will occur and may cause the amplifier to  
shut itself down. It is thus recommend that the unit is  
situated in an open rather than enclosed space and away  
from other sources of heat.  
MAINS POWER INPUT  
Check the rear panel mains switch is set to “off”.  
Connect the supplied mains lead to the IEC socket near  
base of back panel. Connect the other end to a mains  
power socket.  
TRIGGER INPUT  
A remote triggering input is available to allow the  
amplifier to be turned on automatically by other  
equipment. This is a 2-way 3.5mm jack on the back of  
the unit labelled “TRIGGER”. It requires 5 to 12V  
(either polarity) to switch the amplifier on. Such a  
trigger signal is available from (for example) most home  
theatre setups.  
AUDIO CONNECTIONS  
Inputs: The AMS50 has a pair of RCA (single ended),  
and XLR (balanced) level inputs. Choose which inputs  
are to be used. It is recommended using the XLR inputs  
if your preamp features XLR balanced outputs to obtain  
maximum benefits of the balanced circuits.  
Either the RCA or XLR inputs can be used at any one  
time. It is not possible, for example, to connect both  
RCA and XLR sources and use the switch to select  
between the two.  
Note: The trigger input acts as override to the front  
panel push switch only. The unit will need to be  
switched ‘on’ using the rocker switch at the back in  
order for the trigger input to work.  
FOR XLR INPUTS:  
CAUTION!!  
The XLR balanced input allows direct connection from  
a pre-amplifier’s balanced outputs where available. This  
provides a trap for external noise and distortion artefacts  
whilst allowing the signal through completely  
unaffected.  
This unit features a BRIDGED output and should NOT  
be grounded on either output terminal as both are  
effectively “hot”. Please check if using any active  
“sub”, electrostatic, or other non standard speaker types  
directly connected to the outputs of the AMS50. Consult  
speaker manual or supplier if in doubt.  
Make sure the RCA/XLR selector slide switch on the  
back panel is set correspondingly (down).  
Additional note-  
If bi-amping, please ensure that speaker shorting links  
linking treble and bass units are removed. Failure to do  
so may result in damage to connected amplifier(s)  
and/or the AMS50 itself. See loudspeaker instructions  
for more information.  
FOR RCA INPUT:  
The RCA line input allows connection from a  
preamplifier or amplifier’s preamp RCA (single ended)  
outputs.  
Use phono to phono cables to connect the left and right  
outputs on the preamplifier outputs to the left and right  
line level inputs on the AMS50.  
Make sure the RCA/XLR selector slide switch on the  
back panel is set correspondingly (up).  
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.  
Note: in both input cases it is assumed that the driving  
preamplifier has a VOLUME CONTROL to allow  
setting of listening level. This is important as the  
AMS50 has no volume control of its own.  
Issue 1  
Page 6 of 12  
 
AMPLIFIER CONNECTIONS  
AMS50  
FRONT PANEL  
1
2
3
4
5
6
7
1. LEFT CHANNEL Mains LED  
2. LEFT CHANNEL Operate LED  
3. LEFT CHANNEL Temperature LED  
4. POWER Switch  
5. RIGHT CHANNEL Temperature LED  
6. RIGHT CHANNEL Operate LED  
7. RIGHT CHANNEL Mains LED  
BACK PANEL  
8. DUAL RIGHT SPEAKER Output binding posts  
9. RIGHT XLR Balanced input socket  
10. RIGHT RCA Input socket  
12. LEFT RCA Input socket  
13. LEFT XLR Balanced input socket  
14. DUAL LEFT SPEAKER Output 4mm binding posts  
11. XLR/RCA Input selector switch  
8
9
10  
11  
12  
13  
14  
15  
16  
17  
17. MAINS INLET IEC socket  
15. MAINS ON/OFF switch  
16. TRIGGER input 3.5mm jack  
Issue 1  
Page 7 of 12  
 
AMPLIFIER OPERATION  
AMS50  
POWER ON  
Once all connections are made, switch on the unit, using  
the ON/OFF rocker switch on the back panel. On the  
front panel of the AMS50 the front MAINS LEDs glow  
to indicate mains is present.  
To switch the unit on use front panel button, press once  
and the operate LEDs will light (and mains LEDs  
extinguish), indicating the unit is ready for use.  
Alternatively, using the TRIGGER input, switch on  
the triggering unit (preamp, Home Theatre processor,  
etc) and the AMS50 will come on automatically.  
OVERHEAT  
Should any internal overheat situation have been  
reached, the amplifier will cut out, there will be no more  
sound output, and the orange LED will light.  
Unit will remain in this state until it has cooled down  
again. If overheat mode persists, check wiring for errors,  
and locate unit where it can cool down more easily.  
Issue 1  
Page 8 of 12  
 
AMPLIFIER SPECIFICATIONS  
AMS50  
Basic problem-solving with an amplifier is similar to troubleshooting other electrical or electronic equipment. Always  
check the most obvious possible causes first, such as the following examples:  
Problem  
Probable Cause  
Remedy  
No power when POWER switched  
turned on  
Mains power plug is not fully inserted Plug in securely  
into rear socket  
No mains power  
Check socket with another appliance  
Unit not coming on via TRIGGER  
input  
Mains power not present  
Check unit is plugged in and switched  
on (back panel switch).  
Trigger lead disconnected  
Triggering unit not sending trigger  
signal  
Check lead is fully connected and  
triggering unit is on and sending a  
trigger signal (±5 to 12V nominal)  
Move RCA/XLR switch to correct  
position  
Noisy or reduced sound  
Wrong input selected  
Both RCA and XLR inputs connected Remove unwanted source.  
to source(s)  
Sound is not precise, lacking in bass  
and stereo image (when used in  
conjunction with other unit(s))  
Speakers are connected out of phase,  
i.e., connections to one speaker (+  
and -) are reversed on one or more  
units  
Ensure speakers are connected  
correctly:  
+ terminal on amplifier goes to +  
terminal on speaker,  
- terminal on amplifier goes to –  
terminal on speaker.  
Note: Most cables have polarity  
markings to help get this right.  
Make sure unit is situated to allow  
free air circulation. Allow to cool  
down before attempting to switch on  
again  
Unit cuts out, orange LED lit  
Flashing RED LED  
Overheating  
Short circuit in speaker (output) leads Check speaker leads connected to  
SPEAKER OUTs on AMS50 and  
speaker ends for stray strands or short  
circuits.  
Problem in speakers  
Grounded via speaker  
Check speakers and wiring.  
Wait 30 seconds before switching  
back on, and apply music source.  
Both the + and – speaker output  
terminals on this unit are “hot”. Some  
speakers e.g. active subs and  
electrostatics have “grounded” inputs.  
Such speakers are incompatible with  
the AMS50.  
Hum  
Audio connector plug not fully  
pushed in  
Input not correctly selected  
Cable Fault  
Insert plug securely  
Move input switch to correct position  
Check cable is connected at both  
ends.  
Unsuitable Cable  
(e.g. cable grounds not connected)  
N.B. some esoteric cables have  
internal wiring intentionally  
disconnected/modified. For best  
results on all inputs, please use good  
quality straight- through cables,  
signal lead(s) directly connected at  
both ends and earth/screen(s) directly  
connected at both ends.  
If none of these actions affect a cure, please contact your dealer, or an authorised Musical Fidelity service agent.  
Remember; never open the case of the AMS50 yourself, as this will invalidate the guarantee.  
Issue 1  
Page 9 of 12  
 
AMPLIFIER SPECIFICATIONS  
AMS50  
Issue 1  
Page 10 of 12  
 
AMPLIFIER SPECIFICATIONS  
AMS50  
Output:  
Power  
50 Watts per channel into 8 Ohms (17dBW),  
100 Watts per channel into 4 Ohms  
Voltage, RMS  
20 Volts 20Hz to 20 kHz  
58 Volts  
100 Amps  
Voltage, Peak-to-peak  
Current peak-to-peak  
Damping factor  
190  
Output devices  
12 per channel  
Thermal cut out (internal temp) 70ºC  
Balanced Line input:  
THD + noise, 20Hz to 20 kHz < 0.006% unwtd.  
Signal to noise ratio > 110dB ‘A’-weighted  
Input sensitivity for 50 Watts 650mV  
Input impedance  
50k Ohms  
Frequency response  
10Hz to 40 kHz, +0, -0.4dB  
Connections:  
Line level inputs  
1 pair line level XLR (balanced) connectors  
1 pair line level RCA connectors  
4 pair 4mm banana plug/binding posts  
3.5mm/” mono jack socket  
±5V to ±12V  
Speaker outputs  
Trigger input  
Trigger level  
Power requirement:  
Mains voltages:  
115/230VAC 50/60Hz (factory pre-set)  
100VAC 50/60Hz (alternative)  
600 Watts maximum into 8 Ohms  
14 Watts idle (mains LEDs lit)  
Consumption:  
Weight:  
60 kg  
65 kg  
132 lbs  
143 lbs  
unit only, unboxed  
in shipping carton  
Dimensions: 483 mm  
325 mm  
19 inches  
12¾ inches  
18¼ inches  
wide  
high including feet  
deep (front to back) including terminals  
460 mm  
Standard accessories:  
IEC type mains lead (10-Amp type),  
Musical Fidelity reserves the right to make  
improvements which may result in specification or  
feature changes without notice.  
Issue 1  
Page 11 of 12  
 
MANUAL REVISION  
AMS50  
RELEASE  
DATE  
CHANGES  
Issue 1  
28th May 2009-05-28  
1st issue  
Issue 1  
Page 12 of 12  
 

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