Meridian America Stereo Amplifier Meridian 505 User Manual

Meridian 505 Mono Power Amplifier  
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Contents  
Introduction  
1
Introduces the 505 Mono Power Amplifier,  
and provides an overview of the other  
products available in the Meridian 500  
Series.  
Setting up the mono  
power amplifier  
7
Describes how to unpack, install, and use  
the mono power amplifier, and explains  
what you should do if your mono power  
amplifier requires servicing.  
The Meridian 500 Series ........................  
Sample configurations ...........................  
Specification and accessories ...............  
2
3
6
Unpacking ..............................................  
Connecting the mono power  
8
9
amplifier .................................................  
Troubleshooting ..................................... 13  
Maintenance .......................................... 14  
Service and guarantee ........................... 15  
Index ...................................................... 17  
iii  
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iv  
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Introduction  
In choosing the 505 Mono Power Amplifier you have acquired a  
component that combines major advances in audio and engineering  
design.  
The 505 Mono Power Amplifier uses a unique feedback topology and  
precision local error correction system. It includes a massive single wound  
toroidal transformer, and the unit has full thermal, load, and DC protection.  
This guide is designed to enable you to obtain the best possible results  
from the unit in conjunction with the other units in your system.  
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The Meridian 500 Series  
The Meridian 500 Series is a unique system of digital, analogue,  
and video components designed to meet the demand for  
absolute quality, ease of use, and lasting value.  
500 Series communications  
The Meridian 500 Series includes a sophisticated  
communications link, to ensure that any configuration of units  
will work together as a fully integrated system.  
The flexibility of the Meridian 500 Series is such that you can  
assemble a system as simple or as complex as you need,  
perfectly suited to your musical and environmental requirements,  
and with the ability to add to it or change it at a later date should  
your requirements change. The 500 Series is also compatible  
with the existing Meridian 200 Series and 600 Series  
components.  
The 500 Series communications system allows you to control  
any combination of units using a single handset, and ensures  
that your commands from the handset are interpreted  
unambiguously. It also allows all the units to be switched off  
from the front panel of any unit in the system.  
Each Meridian 500 Series component is housed in a matching  
slim line case. Front panel controls provide access to the most  
important functions, and the full range of functions is available  
from the Meridian System Handset using a simple and intuitive  
control interface.  
Professional features  
The 500 Series also provides features for professional users,  
including RS232 computer control, and balanced connections.  
The following pages give examples of four suggested  
configurations to illustrate the flexibility of the Meridian 500  
Series.  
2
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Sample configurations  
508 Compact Disc Player  
500 Compact Disc Transport  
DSP5000  
DSP5000  
A500  
A500  
508  
502  
505  
505  
500  
504  
562  
The 508 Compact Disc Player is an integrated CD transport and  
converter, providing both digital and analogue outputs.  
The 500 Compact Disc Transport provides a precision digital  
output, and can drive DSP5000 Digital Loudspeakers directly.  
The 508 Compact Disc Player is ideally suited for use with a pair  
of Meridian 505 Mono Power Amplifiers and A500  
Loudspeakers, with control over the volume and source  
selection provided by the 502 Analogue Controller. These units  
provide balanced inputs and outputs, allowing a completely  
balanced system to be created.  
A 562 Digital Control Unit can be added to cater for conventional  
analogue sources, and provide source selection between up to  
12 different analogue or digital sources.  
The 504 FM Tuner is an ideal addition to the system if radio  
reception is required.  
3
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566 20-bit Digital to Analogue  
Converter  
502 Analogue Controller  
A500  
A500  
500  
566  
505  
505  
502  
The digital output provided by the 500 Compact Disc Transport  
can be decoded by the 566 20-bit Digital to Analogue converter  
to provide a high-quality audio output for use with a  
The 502 Analogue Controller is a full function preamplifier for use  
with any analogue source, and includes balanced inputs to allow  
you to take advantage of balanced sources, including the 566  
20-bit Digital to Analogue Converter. It provides balanced  
outputs which are ideal for use with a pair of 505 Mono Power  
Amplifiers.  
conventional audio preamplifier. The 566 20-bit Digital to  
Analogue Converter can also decode digital signals from other  
sources, including LaserDisc players and Digital Audio Tape.  
4
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562V Multimedia Controller  
DSP6000 DSP6000  
Satellite  
Video recorder  
Television  
504  
500  
LaserDisc  
562V  
conventional analogue sources such as the 504 FM Tuner and  
video sound.  
The 562V Multimedia Controller is the ideal control unit for use  
with the Meridian DSP6000 Digital Loudspeakers.  
It also includes video switching for CVBS and S-VHS signals,  
such as from a satellite receiver, LaserDisc player, or video  
recorder.  
It provides direct digital inputs for digital sources, such as the  
500 Compact Disc Transport and LaserDisc sound, together  
with precision Delta Sigma Analogue to Digital Conversion, for  
5
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Specification and accessories  
Specification  
Available accessories  
Input  
1.27V RMS (phono).  
2.5V RMS (balanced).  
The following accessories are available from your dealer:  
Power cord Europe.  
Output (stereo)  
Greater than 160W per channel into 8.  
Greater than 270W per channel into 4.  
Power cord Canada and USA.  
Distortion  
Noise  
Less than 0.05%.  
Less than -90dB.  
Finish  
Black textured enamel and glass.  
Heatsinks black painted aluminium.  
Dimensions  
88mm x 400mm x 320mm  
(3.45" x 15.7" x 12.6").  
Weight  
11kg.  
Consumption  
30VA quiescent, 600VA max.  
Meridian Audio reserves the right to amend product  
specifications at any time.  
6
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Setting up the mono  
power amplifier  
This chapter explains how to install the mono power amplifier. It  
describes what you should find when you unpack the mono power  
amplifier, how you should connect it to your other audio equipment, and  
the siting constraints.  
You should not make any connections to the mono power amplifier or to  
any other component in your system whilst the AC power supply is  
connected and switched on.  
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Unpacking  
The 505 Mono Power Amplifier comes in a box containing the  
following components:  
Once set up, the mono power amplifier can be left switched on  
as it consumes negligible power when not in use.  
505 Mono Power Amplifier.  
1 power cord.  
If you are not going to use the mono power amplifier for a period  
of several days you should switch the unit completely off, at the  
back panel, and disconnect it from the AC power supply.  
1 phono shorting plug.  
This manual.  
To position the mono power amplifier  
You are advised to retain the packing in case you need to  
transport the unit.  
During normal operation the heatsinks, ie the fins at each end of  
the case, may become quite hot. The mono power amplifier  
should therefore be positioned to allow a free flow of air around  
the fins.  
Before connecting power  
Before you begin installation you should ensure that your mono  
power amplifier is set to the correct voltage for your local AC  
supply. If it is not, do not try to install the unit, and contact your  
dealer.  
Do not place the mono power amplifier:  
On a surface that may be scorched by the heat generated;  
eg a carpet.  
Do not make connections, or insert or remove plugs, while  
the unit is connected to the supply and switched on, as the  
transients generated could damage the loudspeaker.  
In direct sunlight.  
Near heat sources, eg a radiator.  
Stacked with any other audio products, as the heat it  
generates may damage the other products.  
8
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Connecting the mono power amplifier  
Back panel  
BALANCED INPUT  
(use shorting plug)  
INPUT  
OFF  
ON  
+
+
-
-
Balanced  
input  
Phono  
input  
Outputs (+)  
Outputs (-)  
Outputs  
Each 505 Mono Power Amplifier provides twin outputs for bi-  
wiring. On speakers that provide separate connections to the  
bass/mid and tweeter units this allows the units to be connected  
independently to the mono power amplifier, for optimum sound  
quality.  
The following table gives details of the output connections:  
Use these outputs To connect to this  
+, -  
Loudspeakers of 4to 16, using  
either plug or bare wire connections.  
Alternatively, for loudspeakers providing a single pair of inputs,  
either of the output terminals can be used.  
9
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Inputs  
To connect to a conventional  
preamplifier  
The following two alternative audio inputs are provided:  
Connect the socket marked INPUT on the back panel of the  
power amplifier to the appropriate output from your  
preamplifier.  
Use this input  
To connect to this  
INPUT  
A preamplifier, using a phono  
connector and high-quality screened  
cable.  
You should either use a screened audio cable, or half of a twin-  
screened audio cable. These cables can have a considerable  
effect on the quality of the sound, and you are advised to seek  
your dealer’s advice on the best type of cables for your system.  
BALANCED INPUT  
A balanced analogue output, using an  
XLR connector:  
1 (Green) = GND  
2 (Red) = +ve  
3 (Black) = -ve  
When using the balanced input the phono input should be  
shorted, using the phono shorting plug supplied.  
10  
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To connect to a 501 Control Unit  
To connect to A500 Loudspeakers  
505 Mono Power Amplifier  
A500 Loudspeaker  
A500 Loudspeaker  
INPUT  
505 Mono Power Amplifier  
505 Mono Power Amplifier  
501 Control Unit  
505 Mono Power Amplifier  
INPUT  
OUTPUT  
Audio leads  
Connect the sockets marked OUTPUT L and R on the back  
panel of the 501 Control Unit to the INPUT socket on the back  
panel of each of the 505 Mono Power Amplifiers.  
Use the links provided to bridge the HF and LF terminals on  
the back of each loudspeaker.  
Connect the red and black terminals from each loudspeaker  
to one pair of red and black terminals on the appropriate  
power amplifier.  
11  
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To bi-wire to A500 Loudspeakers  
A500 Loudspeaker  
A500 Loudspeaker  
505 Mono Power Amplifier  
505 Mono Power Amplifier  
If necessary, remove the links bridging the LF and HF  
terminals on the back of each loudspeaker.  
Connect the LF red and black terminals from each  
loudspeaker to the red and black terminals on the appropriate  
power amplifier, using twin loudspeaker cable.  
Connect the HF red and black terminals from each  
loudspeaker to the other pair of red and black terminals on  
the appropriate power amplifier.  
12  
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Troubleshooting  
This section describes problems you may encounter when using  
the mono power amplifier, and includes suggested solutions.  
The sound has cut out  
The 505 Mono Power Amplifier includes a thermal shutdown,  
which mutes the output if the amplifier becomes too hot.  
If these suggestions fail to cure the problem, please contact  
your Meridian dealer for further assistance.  
Leave the amplifier for a few minutes to cool down, and the  
No front panel indicator is shown  
sound will come back on.  
Check that your AC power supply is connected correctly.  
The 505 Mono Power Amplifier also includes a power circuit  
breaker to protect the loudspeakers.  
Check that the ON OFF switch on the back panel is in the ON  
position.  
Check the system for the cause of the cut out.  
Check that the fuse on the mono power amplifier back panel  
and the fuse in the unit’s power plug have not blown; see To  
change the mains fuse, page 14.  
Switch off, wait 5 seconds, then switch on to reset the power.  
The output is noisy when using a  
balanced lead  
Check that the phono input is shorted, using the phono  
shorting plug supplied.  
13  
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Maintenance  
Cleaning  
To change the mains fuse  
Fuse  
Spare  
When cleaning the mono power amplifier bear in mind that the  
front of the unit is metal, and the lid is glass.  
Disconnect the power cord before cleaning the unit.  
Note: Do not use abrasive cleaners on any part of the mono  
power amplifier.  
Remove the mains connector, and pull out the drawer next to  
the power input to access the fuses.  
To clean the case  
Before replacing a blown fuse, if possible ascertain the cause of  
the failure.  
Use a slightly damp cloth.  
Ensure that no water is allowed to get inside the case, and do  
not reconnect the power until you are certain that the mono  
power amplifier is completely dry.  
The fuse drawer includes a spare fuse. This should be replaced  
by one of the same rating.  
To clean the audio connections  
The audio socket on the back of the mono power amplifier is  
gold-plated and needs no cleaning if a gold-plated phono plug is  
used. Otherwise, it is recommended that you unplug and  
reconnect the plug at least once a year. A proprietary contact  
cleaner can be used to some advantage.  
14  
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Service and guarantee  
Service  
Guarantee  
The Meridian 500 Series of hi-fi components have been carefully  
designed to give years of untroubled service. There are no user-  
serviceable parts inside the case, nor do the units require any  
form of maintenance.  
The 505 Mono Power Amplifier is guaranteed against defects in  
material and workmanship for two years from the date of  
purchase.  
The guarantee is void if the 505 Mono Power Amplifier has been  
subject to misuse, accident, or negligence, or has been  
In the unlikely event that your mono power amplifier fails to  
function correctly, it should be returned, in its original  
packaging, to your Meridian dealer.  
tampered with or modified in any way without the written  
authorisation of Meridian Audio Limited. Attempted servicing by  
unauthorised people may also invalidate this guarantee. Labour  
and carriage charges are not covered unless by local agreement.  
In case of difficulty within the UK or USA please contact the  
appropriate sales and service address shown on page ii.  
Outside the UK, local warranty liability is restricted to equipment  
purchased within the territory. Our agents abroad are only under  
contractual obligation to service under guarantee equipment  
sold through them. They are entitled to make a non-refundable  
charge for any service carried out on other equipment.  
In case of difficulty outside the UK or USA, contact the importing  
agent for the territory. A list of Meridian agents abroad is  
available from Meridian Audio.  
No responsibility can be accepted for the mono power amplifier  
whilst in transit to the factory or an agent, and customers are  
therefore advised to insure the unit.  
This guarantee does not limit your statutory rights within the  
United Kingdom.  
When seeking service under guarantee, proof of the date of  
purchase will be required.  
15  
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16  
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Index  
A
B
Accessories  
6
M
Maintenance 14  
P
S
Positioning  
8
Meridian 500 Series  
2
phono shorting plugs 10, 13  
Balanced input 10  
500 Compact Disc Transport  
502 Analogue Controller 3, 4  
3
Bi-wire connection 9, 12  
Service 15  
Sound has cut out 13  
505 Mono Power Amplifier  
508 Compact Disc Player  
3
C
Cleaning  
Specification  
Switching on  
6
8
3
the audio connections 14  
the case 14  
562 Digital Control Unit  
562V Multimedia Controller  
566 20-bit Digital to Analogue  
Converter  
communications  
3
5
Components  
Connecting  
8
T
Thermal protection 13  
Troubleshooting 13  
4
to a 501 Control Unit 11  
2
U
X
Unpacking  
8
to a conventional preamplifier 10  
to A500 Loudspeakers 11, 12  
Meridian A500 Loudspeakers  
Meridian DSP5000 Digital  
3
XLR connectors 10  
Loudspeakers  
Meridian DSP6000 Digital  
Loudspeakers  
3
F
G
H
Fuse, replacing 14  
Guarantee 15  
5
Meridian System Handset  
2
Heat generated during  
N
O
Noise on output 13  
operation  
8
Outputs  
9
I
Inputs 10  
Overheating 8, 13  
Installing  
8
Introduction  
1
17  
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