Meridian Audio Speaker M60C User Manual

MERIDIAN M60C USER GUIDE  
Meridian Audio Ltd  
14 Clifton Road  
Huntingdon  
Cambridgeshire PE18 7EJ  
England  
Tel (0) 1480 52144  
Fax (0) 1480 459934  
Meridian America Inc  
3800 Camp Creek Parkway  
Building 2400 Suite 112  
Atlanta GA 30331  
USA  
Tel (404) 344-7111  
Fax (404) 346-7111  
Author: Duncan M Smith  
“Boothroyd|Stuart Meridian”, MERIDIAN  
and “Meridian Digital Theatre”are  
registered trademarks of Meridian Audio  
Ltd  
© Meridian Audio Ltd 1995  
 
3
If any of these items is missing, please contact your dealer. We  
suggest that you retain the packaging carefully, as it provides  
maximum protection in transit.  
WARNING:Take great care when unpacking or repacking the  
M60C that you do not put undue pressure on the front, as the  
drive units may be damaged if pressed.  
Getting Going  
IMPORTANT: Before connecting to the AC supply, check that the  
unit has been manufactured to the correct supply voltage for your  
territory.  
Do not make any alterations to the connections of your system  
with the M60C AC power switched on.  
To get going:  
·
Use the audio cable supplied to connect the unbalanced input  
of the speaker to an appropriate preamplifier or surround  
sound decoder.  
·
·
·
Switch on the power at the source at a low volume level.  
Connect the M60C to AC power with the cord provided.  
Switch on the M60C with the switch located next to the AC  
power inlet. A green light should appear at the front of the unit  
and you should be able to play music.  
If you cannot hear any sound, refer to Help!  
Installing your M60C  
This section explains how to get the best from your M60C  
installation. If your system includes a Meridian 565 Digital  
Surround Processor, you will find more information on correct  
installation in its User Guide.  
Connections  
AC power connects to the M60 at the left hand end of the speaker  
viewed from the front. Where possible connect the M60C to a  
grounded socket using the mains lead provided. Try to use a  
separate AC power outlet for each active speaker. The use of  
adapter units is discouraged as they degrade the sound quality.  
Unbalanced audio may be connected to the single phono socket.  
This can be connected to any preamplifier or surround sound  
decoder such as the Meridian 565 Digital Surround Processor. In  
this case connect to the Analogue Centre output.  
M60C User Guide  
 
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Balanced audio may be connected instead using the Balanced  
InputXLR socket. If your preamp or surround decoder has a  
balanced output, it may be connected as follows.  
Connections to XLR:  
1. Shield and ground or common.  
2
1
2. Signal phase positive.  
3. Signal phase negative.  
3
Siting  
We recommend that you now set up the system so that you can  
listen to music and adjust the position of the M60Cs if necessary.  
Vertical operation  
Although primarily intended for horizontal mounting, the M60C can  
also be used in the vertical orientation. The best sound would  
result from a position which is 90 degrees clockwise from the  
‘normal’ orientation.  
As a Centre Channel  
The M60C is ideally suited as a centre-channel speaker for  
surround sound installations.  
The location you choose will depend on whether you intend the  
surround system for music only or whether it is to be used in  
conjunction with a TV, monitor or video projector.  
If the application is music only, place the speaker centrally  
between the main left–right pair and arrange for the tweeters of  
the three speakers to be approximately the same height 1.  
If the application is video-associated then the constraints of the  
video system will largely dictate the position.  
If at all possible note the following guidelines:  
·
·
·
·
·
Height of left – centre – right to be as even as possible.  
Above a TV is vastly better than below.  
Directly on a TV is OK, the M60C is magnetically shielded.  
Below a TV will work if adequate cooling is available.  
In a custom cabinet it is entirely the responsibility of you and  
your dealer to ensure adequate ventilation. If in doubt this can  
determined by operating the unit and monitoring the  
temperature of the backplate which is also the heatsink.  
·
Permanent wiring to a building is prohibited by most building  
codes.  
1 Preferably within 1 foot, 30cm.  
M60C User Guide  
 
5
As a Left – Right or a Surround pair  
The locations chosen for a pair of M60Cs are crucial to getting the  
best possible acoustic result. For two-channel stereo, the two  
speakers should ideally be equidistant from the main listening  
position, and the same distance apart.  
Since it has a horizontal format, the M60C can be mounted on a  
strong shelf or on a suitable stand – about which your dealer can  
advise.  
General guidelines  
In order to get the best acoustic performance from your M60C in  
your room, you should try to achieve the following:  
·
If possible, have the most acoustically absorbent wall in the  
room behind the front speakers. They could, for example, be in  
front of an open bookcase or curtained window, or on each side  
of a bow window.  
·
·
If possible, have each M60C at least 50cm from a corner.  
If possible, locate the listening position so that your head is at  
least 60cm from the wall behind you (unless this is acoustically  
absorbent).  
Consider the following practical points:  
·
If possible, you should locate the M60C so that the electronics  
(back) of the speaker are not subjected to long-term strong  
sunshine. The back plates should be cool (less than hand-hot)  
when the unit is not in use.  
·
·
You should not, if possible, locate a M60C with its back to any  
heat source – for example, a central heating radiator.  
You should not, locate a M60C with its back fully enclosed so  
that it cannot dissipate heat from the rear-panel heatsink.  
Final adjustments  
The best sound possible will only be obtained if the M60C is firmly  
mounted and cannot rock.  
Operation  
Normally the M60C should be left switched on, even when the unit  
is not in use. The sound quality of the unit is at its best when the  
temperature of the components has reached normal working  
levels. This takes about an hour.  
The electronics in the M60C use the very latest techniques to  
ensure that the idle power consumption of the unit is very low.  
This ensures long periods of cool running and low energy  
consumption.  
All audio equipment should be switched off if you expect to be  
away from the installation for an extended period.  
M60C User Guide  
 
6
Maintenance  
There are no user serviceable parts inside the M60C.  
One or two days after installation check the tightness of the fixing  
screws of the loudspeaker drivers. These screws may loosen  
slightly in shipping or with extremes of temperature or humidity,  
and the speaker will not sound at its best with them loose. Do not  
over tighten them. It is worth checking these screws after transit or  
extended periods of loud playing.  
The electronics do not need routine maintenance.  
The audio sockets are gold plated and, where gold plated phono  
sockets are used, there should be no need to clean the contacts.  
Other phono plugs should be unplugged and replugged once a  
year. Some proprietary contact cleaners may be used to  
advantage, but you should seek the advice of your dealer.  
Help!  
No Sound.  
·
Check the AC power supply to the M60C. The green light on  
the front should be lit.  
·
·
Check the AC supply to the other units in the system.  
Check correct source is selected and that the source itself is  
producing music.  
·
Check interconnections are made to the correct sockets.  
Unit goes silent when played hard.  
M60C has a temperature sensing system on board which prevents  
overheating of the electronics. The sound will continue when the  
speaker has cooled.  
Cleaning  
The cabinet of the M60C is finished with veneer and may be wiped  
clean with a damp cloth.  
The display panel is glass, and should be cleaned using a barely  
damp chamois leather.  
Do not use abrasive cleaners on any part of the M60C.  
M60C User Guide  
 
7
Service  
The Meridian M60C has been carefully designed to give years of  
untroubled service.  
In the unlikely event that your M60C fails to function correctly, it  
should be returned, in its original packing, to your Meridian dealer.  
In case of difficulty, please write to the following address if you live  
in the UK:  
Digital Gramophone & Wireless Ltd  
14 Clifton Road  
Huntingdon  
Cambridgeshire PE18 7EJ  
Outside the UK, contact the importing agent for the territory. A list  
of Meridian agents abroad is available from the above address.  
No responsibility can be accepted for the M60C while it is in transit  
to the factory or an agent, and customers are therefore advised to  
insure the unit.  
In the USA and Canada, contact  
Meridian America Inc.  
3800 Camp Creek Parkway  
Building 2400 Suite 112  
Atlanta GA 30331  
Tel (404) 344-7111  
Fax (404) 346-7111  
Guarantee  
The Meridian M60C is guaranteed against defects in material and  
workmanship for 12 months from the date of purchase.  
The guarantee is void if the M60C has been subjected to misuse,  
accident or negligence, or has been in any way tampered with or  
modified without the written authorisation of DGW Ltd.  
Attempted servicing by unauthorised people may invalidate the  
guarantee.  
Labour and carriage charges are not covered unless by local  
agreement.  
If you request service under guarantee, proof of the date of  
purchase will be required.  
Outside the UK, local warranty liability is restricted to equipment  
purchased within the territory. Our agents abroad are contractually  
obliged to service under guarantee only equipment sold through  
them. They are entitled to make a non-refundable charge for any  
service carried out on other equipment.  
This guarantee does not limit your statutory rights within the  
United Kingdom.  
M60C User Guide  
 
8
Specification  
Audio Inputs  
Unbalanced  
Balanced  
775mV (nominal), gold plated phono  
3Vrms max, XLR  
Complementary bipolar design, with  
output-stage error correction and twin loop  
design  
Power  
Amplifiers  
Tweeter  
Mid + Bass  
Bass  
65W mean power  
65W mean power  
65W mean power  
Distortion  
<0.05%, typically less than 0.01% up to  
full power at all frequencies  
Noise and hum  
< –94dBr  
Acoustic  
Output  
Typically > 108dB spl @ 1m  
< 15dB spl @ 1m  
Noise  
Frequency  
response  
In room response within 3dB, 45Hz–  
20kHz  
Crossover  
Double Butterworth at 2.6kHz, First Order  
at 400Hz  
Drive units  
Bass  
2 x 160mm polypropylene high-efficiency  
long-throw shielded custom drivers  
Tweeter  
Meridian 25mm piston in short horn:  
aluminium dome with silver voice-coil.  
Constructed from fine veneered MDF  
Cabinet  
Dimensions  
Weight  
195x670x280mm  
20 kg each  
Power  
100–125; 200-230; 210–250V AC 50–  
60Hz  
10VA idle; 200VA max  
M60C User Guide  
 

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