Musical Fidelity Stereo Amplifier M6PRX User Manual

Instructions for use  
Thank you for purchasing the Musical Fidelity M6PRX CRPS dual mono power amplifier.  
The M6PRX is designed to be partnered with present and future M6 series products. It features twin  
conservatively rated power amplifier sections connected in dual mono configuration for the absolute best in  
stereo imaging and drive capabilities. Two independent and over-specified choke regulated power supplies also  
ensure the absolute best in supply noise filtering, separation and power reserve possible in a single box power  
amplifier. This combination yields one of the best high-fidelity systems available at any price.  
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 any questions about the audio system, please consult the dealer who is there to help and advise.  
 
SAFETY INFORMATION  
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, it is  
necessary to remove 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 the 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 2  
Page 3 of 11  
 
GENERAL ADVICE  
Installation, Precautions & User Information  
This new M6PRX 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 M6PRX 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 M6PRX, 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 M6PRX 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 the audio system during electrical storms, remove the mains plugs.  
If after-sales service is required, to help the dealer identify the M6PRX please quote the serial number located  
on the rear panel of the unit.  
Issue 2  
Page 4 of 11  
 
ITEM DISPOSAL INFORMATION  
DISPOSAL  
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.  
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.  
DISPOSAL  
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.  
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.  
FACHGERECHTE ENTSORGUNG:  
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.  
AFVAL  
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.  
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  
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.  
ΔΙΑΔΙΚΑΣΙΑ ΑΠΟΡΡΙΨΗΣ  
ΤΟ ΣΗΜΑ ΜΕ ΤΟΝ ΔΙΑΓΕΓΡΑΜΜΕΝΟ ΤΡΟΧΗΛΑΤΟ ΚΑΔΟ ΑΠΟΡΡΙΜΑΤΩΝ ΣΤΗΝ ΠΙΣΩ ΟΨΗ ΤΟΥ  
ΜΗΧΑΝΗΜΑΤΟΣ  
ΔΗΛΩΝΕΙ ΟΤΙ ΤΟ ΠΡΟΙΟΝ ΑΥΤΟ ΔΕΝ ΠΡΕΠΕΙ ΝΑ ΔΙΑΧΕΙΡΙΣΘΕΙ ΣΑΝ ΣΥΝΗΘΙΣΜΕΝΟ ΟΙΚΙΑΚΟ ΑΠΟΒΛΗΤΟ.  
ΠΡΟΣ ΑΠΟΦΥΓΗ ΕΝΔΕΧΟΜΕΝΗΣ ΕΠΙΒΑΡΥΝΣΗΣ ΤΟΥ ΠΕΡΙΒΑΛΛΟΝΤΟΣ, ΞΕΧΩΡΙΣΤΕ ΤΟ ΠΡΟΙΟΝ ΑΠΟ ΤΑ ΑΛΛΑ  
ΑΠΟΡΡΙΜΑΤΑ ΩΣΤΕ ΝΑ ΕΞΑΣΦΑΛΙΣΘΕΙ Η ΑΝΑΚΥΚΛΩΣΗ ΤΟΥ ΜΕ ΤΟΝ ΠΡΕΠΟΝΤΑ ΤΡΟΠΟ.  
ΠΑΡΑΚΑΛΟΥΜΕ ΝΑ ΕΠΙΚΟΙΝΩΝΗΣΕΤΕ ΜΕ ΤΗΝ ΤΟΠΙΚΗ ΥΠΗΡΕΣΙΑ ΑΝΑΚΥΚΛΩΣΗΣ Η ΜΕ ΤΟ ΚΑΤΑΣΤΗΜΑ ΑΓΟΡΑΣ  
ΓΙΑ ΠΕΡΙΣΣΟΤΕΡΕΣ ΛΕΠΤΟΜΕΡΕΙΕΣ.  
Issue 2  
Page 5 of 11  
 
INSTALLATION  
Introduction  
Congratulations on the purchase of the new M6PRX power amplifier. Great attention has been paid to internal  
layout, isolating each circuit section to prevent possible interaction.  
The unit features two monoblock amplifiers with separate choke regulated supplies for the absolute best in  
separation and imaging. Generously rated, 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 and dynamic range, with extraordinary resolution and fine detail.  
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. Using solvents, white spirit or thinners is not  
advised, as they could damage the surface finish.  
Installation  
Position the M6PRX on a stable, horizontal surface where there is no risk of it being knocked, or subjected to  
vibration such as from loudspeakers.  
Important note:  
In normal operation, the unit dissipates a small quantity of power at all times, and it is important  
that it is adequately ventilated. The top and bottom are perforated to allow the smooth flow of heat  
through the unit. It is therefore not recommended that the unit is enclosed in a cabinet or placed  
where the ventilation holes are impeded as this could result in excessive heat build-up.  
The M6PRX must be protected from humidity – if the unit is moved from a cold place to a warm  
room, leave the unit for an hour or so to allow sufficient time for the moisture to evaporate.  
Power Connections  
The M6PRX is supplied with a standard IEC mains cable which plugs into the IEC socket at the back of the unit  
(see page 7)  
Audio Connections  
RCA Inputs: Connect all RCA single-ended sources to relevant analogue inputs (see page 7 for more  
information). Use good quality fully connected (signal and ground) coaxial phono cables for all RCA signal  
connections. 2 inputs INPUT A and INPUT B are provided to enable the amplifier to be used with more than  
one setup for example, A = home theatre, B = audio only.  
XLR Inputs: Connect any XLR balanced source to balanced analogue input (see page 7 for more information).  
Use good quality fully connected (signals and ground) balanced XLR cables for all XLR signal connections.  
Outputs: Connect loudspeakers to the terminals on the back panel marked as LEFT and RIGHT SPEAKER  
outputs  
The LOOP OUT output allows the input signals to be passed on to a second amplifier or other component. This  
is useful for bi-amping.  
Issue 2  
Page 6 of 11  
 
FACILITIES & CONNECTIONS  
1
ON/OFF Button  
MAINS LED  
MUTE LED  
2
3
4
5
1
2
3
4
5
INPUT A/B indicator LEDs  
INPUT selector button  
6
7
8
9
10  
11  
12 13 14  
6
7
8
9
LOUDSPEAKER OUTPUTS Right  
BALANCED XLR right input  
11 IEC MAINS INPUT  
12 LOOP output RCA sockets  
13 INPUT B RCA sockets  
14 INPUT A RCA sockets  
BALANCED/RCA Selector for INPUT B  
BALANCED XLR left input  
10 LOUDSPEAKER OUTPUTS Left  
Issue 2  
Page 7 of 11  
 
OPERATION  
Starting  
Once all connections are made, switch on the unit, using the POWER button front of the unit. The MUTE LED  
will light. Speaker outputs are muted for about 6 seconds, so no sound will be heard from the speakers. Once  
the 6 seconds is up the MUTE LED goes out, indicating unit is settled, and ready for use.  
IMPORTANT: BALANCED/RCA switch  
The BALANCED/RCA switch (see page 7) is included to minimise noise when using the unit in RCA mode. In  
most cases it will operate in BALANCED position on RCA inputs with no appreciable audible increase in noise.  
There is no harm in operating the unit in this way.  
However it is important, that if using the XLR (BALANCED) input, the switch must be set for BALANCED (up).  
If the switch is not set for BALANCED on an XLR input, a 6dB reduction in loudness will occur and the benefits  
of BALANCED operation will be lost.  
INPUT A RCA  
To use the RCA INPUT A, connect RCA source outputs to the INPUT A RCA sockets (see page 7). Select  
INPUT A by pressing the INPUT select button so INPUT A LED is lit.  
INPUT B RCA  
To use the RCA INPUT B, connect RCA source outputs to the INPUT B RCA sockets (see page 7). Make sure  
the BALANCED/RCA switch is set for RCA (down). Select INPUT B by pressing the INPUT select button so  
INPUT B LED is lit.  
INPUT B BALANCED  
To use the balanced input, connect balanced source outputs to the balanced input XLR sockets (see page 7).  
Make sure the BALANCED/RCA switch is set for BALANCED (up). Select INPUT B by pressing the INPUT  
button so INPUT B LED is lit.  
It is perfectly acceptable to use an RCA source device on INPUT A and a balanced XLR source on INPUT B  
and use the INPUT select button to select between the two. The BALANCED/RCA switch should be in the  
BALANCED position.  
Note that the INPUT B BALANCED and RCA inputs are shared. It is not recommended to use both balanced  
and single ended modes simultaneously on INPUT B. Loss and/or mixing of signal and/or equipment failure  
may occur if both inputs are used simultaneously.  
Alternatively, two RCA single-ended devices may be connected, one on INPUT A, and the other on input B, use  
the INPUT select button to select between the two. For this scenario, the BALANCED/RCA switch should be  
set for RCA (down).  
Issue 2  
Page 8 of 11  
 
PROBLEMS?  
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 Mains power plug is not fully inserted into rear Plug in securely.  
button is pressed.  
No sound  
socket.  
Mute function is still active.  
Wait for the MUTE LED to go out.  
Wrong connections between input sources and Check audio input lead connections.  
the unit  
Check speaker cables.  
Speakers not connected, or incorrectly wired  
Sound cut  
Loose connection  
Check speaker and input connections.  
Output overload or short circuit  
Switch unit off. Check speaker connections for shorting  
strands or wires. When all has been double-checked  
reduce volume and switch unit back on.  
N.B. Take great care when bi-wiring or bi-amping that  
speaker bass and treble linking straps are removed; see  
speaker manual for more information.  
Sound is not precise, Speakers are connected out of phase, i.e., Ensure speakers are connected with same polarity at  
lacking in bass and stereo connections  
to  
one  
speaker amplifier and speaker ends.  
image.  
(+ and –) are reversed.  
Hum.  
Audio connector plug not fully pushed in  
Cable Fault  
Insert plug securely.  
Check cable is connected at both ends.  
Unsuitable  
(e.g. cable grounds not connected)  
cable N.B. Some esoteric cables have internal wiring  
intentionally disconnected/modified. For best results on  
all inputs analogue AND digital, please use good quality  
screened coax; signal and screens both separately  
connected at both ends.  
No audio output, or too Incorrect or missing connections  
low level output.  
Check connections and make sure they are secure.  
If none of these actions affect a cure, please contact the dealer, or an authorised Musical Fidelity service agent. Remember; never open  
the case of the M6PRX, as this will invalidate the guarantee.  
Issue 2  
Page 9 of 11  
 
SPECIFICATIONS  
Output  
Power  
260 Watts per channel into 8 Ohms (24 dBW)  
Voltage  
46 Volts RMS, 20Hz to 20 kHz; onset of clipping  
(130 Volts peak-to-peak)  
140 Amps  
210  
Current peak-to-peak  
Damping factor  
Output devices  
4 pairs per channel  
Line input  
THD+N  
<0.007% typical, 20 Hz to 20 kHz  
>120 dB ‘A’-weighted  
50k Ohms  
Signal / noise ratio  
Input impedance  
Frequency response  
+0, –1dB, 10Hz to 100 kHz  
Connections  
Line level inputs  
1 pair line level XLR (balanced) connectors  
2 pairs line level RCA connectors  
Line level outputs  
Speaker outputs  
1 pair line level RCA connectors  
4 pairs 4mm banana plug/binding posts  
Power requirement  
Mains voltages  
115/230VAC 50/60Hz (factory pre-set)  
100VAC 50/60Hz (alternative)  
Consumption  
750 Watts maximum  
Weight  
Unit only, unboxed  
In shipping carton  
19.7 kg (43lbs)  
24.4 kg (53lbs)  
Dimensions  
Wide  
440 mm (17”)  
High, including feet  
125 mm (5 ”)  
Deep (front to back) including terminals 390 mm (15”)  
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 2  
Page 10 of 11  
 
MANUAL HISTORY  
RELEASE  
Issue 1  
DATE  
CHANGES  
1st Issue  
14th October 2009  
9th November 2009  
Issue 2  
Back panel updated  
Issue 2  
Page 11 of 11  
 

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