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G Series Power Amplifier
Installation Guide
G Series Power Amplifier 1 9/5/06 11:59:26 am
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i i P r e f a c e Important safety instructions • Read the instructions. To avoid overheating • Keep these instructions. • Leave at least 10cm around the equipment to ensure sufficient • Follow all instructions. ventilation. • Do not use this apparatus near water. • Clean only with a dry cloth. Do not position the product: • Install only in accordance with the manufacturer’s instructions. • In direct sunlight. • Refer all servicing to approved service personnel. • Near heat sources, such as a r
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i i i C o n t e n t s Contents Introduction 1 Provides information about the power amplifier models, a description of each product, and technical specifications. Power amplifier models 1 Specifications 4 Installing the power amplifier 5 Describes how to install the power amplifier and connect it to the other equipment in the system. Unpacking 5 Inputs 6 Outputs 13 Troubleshooting 23 Provides suggested solutions to problems while installing or operating the product. Maintenance 24 Service an
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i v P r e f a c e Copyright and acknowledgements Sales and service in the UK Sales and service in the USA Meridian Audio Ltd Meridian America Inc Latham Road 8055 Troon Circle Huntingdon Suite C Cambridgeshire Austell PE29 6YE GA30168-7849 England USA Tel +44 (0)1480 445678 Tel +1 (404) 344 7111 Fax +44 (0)1480 445686 Fax +1 (404) 346 7111 World Wide Web – http://www.meridian-audio.com/ Boothroyd|Stuart Meridian, Meridian, and Meridian Digital Theatre are registered trademarks of Meridian
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1 I n t r o d u c t i o n Introduction This guide provides full information about unpacking the power amplifier, and connecting it to the other equipment in the system. Power amplifier models This Installation Guide applies to the G55 Five-channel Power Amplifier, G56 Two-channel Power Amplifier, and G57 Two-channel Power Amplifier. The main differences between each of these products are explained in the following table: Product Channels Power per channel Bridged G55 5 100W into 8 Ω, 160W in
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2 I n t r o d u c t i o n reliability. The result is a clear, open sound with detail as well as General features punch where it’s required. Each of the G Series power amplifiers is based on modules that feature a symmetrical design with fully electronically-balanced Trigger and other control signals are optically isolated from the inputs. Both balanced and unbalanced inputs are provided, but in amplifier itself. When in standby mode, a standing voltage is fact the unbalanced inputs are con
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3 I n t r o d u c t i o n G55 Five-channel Power Amplifier The Meridian G55 is a five-channel unit, and delivers a solid 100W RMS per channel continuous into 8 Ω. The outer pairs of channels can be operated in bridge mode by actuating a back-panel rocker switch on the channel 1 and/or channel 5 modules, in which case the first channel input of the pair becomes the bridged input and the upper output terminals are linked, power being derived from the lower terminal pairs. G56 Two-channel pow
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4 I n t r o d u c t i o n Specifications G55 G56 G57 Distortion Less than 0.01%. Less than 0.01%. Less than 0.01%. Signal/Noise Better than -100dB. Better than -100dB. Better than -100dB. Inputs Balanced on XLR and unbalanced on phono. Sensitivity 1.0V RMS phono/per leg balanced. 1.0V RMS phono/per leg balanced. 1.4V RMS phono/per leg balanced. Input 16k Ω phono, 32k Ω balanced. 16k Ω phono, 32k Ω balanced. 16k Ω phono, 32k Ω balanced. impedance Outputs Twin outputs for bi-wiring. Twin outputs f
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5 I n s t a l l i n g t h e p o w e r a m p l i f i e r Installing the power amplifier This chapter explains how to install the power amplifier. It describes what you should find when you unpack the product, and how you should connect it to the other equipment in the system. You should not make any connections to the product or to any other component in the system while the AC power supply is connected and switched on. • Stacked with any other audio products, as the heat it generates Unpac
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6 I n s t a l l i n g t h e p o w e r a m p l i f i e r Inputs G55 Five-channel Power Amplifier ���������������������������������������� �� ��������� ������������������ ������������������ ��������� ��������� ��������� ��������� ��������� ����������������� ����� � � ����� � � � � � � � � ��� � � ����� ������ ������� ��� ��� ��� ��� �������������� ������� ������������� � ������ ������������� ��� ��� ��� ������� ��� ������� ��� ������� ��� ������� ��� ������� � ������� � ������� � ������� � �����
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7 I n s t a l l i n g t h e p o w e r a m p l i f i e r To connect the G55 to an unbalanced preamplifier (eg G01 Control Unit) G55 Five-channel Power Amplifier G01 Control Unit OFF OFF PRE OUT AUDIO LEAD AUDIO LEAD • Switch the BRIDGE MODE switch for channels 1/2 to the OFF • Switch the corresponding channels to the UNBALANCED position. position. You should either use a twin-screened audio cable, or a pair of • Connect the UNBALANCED sockets on the power amplifier to the single-screened audi
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8 I n s t a l l i n g t h e p o w e r a m p l i f i e r To connect the G55 to a G68AXV Digital Surround Controller G55 Five-channel Power Amplifier G68AXV Digital Surround Controller OFF OFF SIDE LR REAR LR A/B LR LEFT RIGHT CENTRE SUB • Switch the two BRIDGE MODE switches to the OFF position. • Connect the LEFT, RIGHT, and CENTRE balanced outputs from the G68AXV to the channel 1, 2, and 3 BALANCED inputs on the G55. • Switch channels 1, 2, and 3 to the BALANCED position. • Connect the REAR-
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9 I n s t a l l i n g t h e p o w e r a m p l i f i e r G56 Two-channel Power Amplifier � ������������ ���������������������� ��������������������� �� ��������� ������� ������������������������� � � � � � � � � � � � ������������ ������ ����������� � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � ����� �� ��� ������� ���� ������� �������� ������ ������ � � � � � � � � � � � � � � � � � � � � � � � �� ������ �������� ����� ����� �� ��� � � � � � � � � � � � � � � � � � � � � � � �
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1 0 I n s t a l l i n g t h e p o w e r a m p l i f i e r G57 Two-channel Power Amplifier �������������������� ������������������� �������������������� ������������������� ���������������������� ��������������������� ������������������������������� ������������ �� ����������������������������� ����� ������������������������������� �������������������� ���������� ������������������ ������� ������ �������������������������� ��� �������������� �� �������������������� ��� ������� � ������� � �����
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1 1 I n s t a l l i n g t h e p o w e r a m p l i f i e r To connect to an unbalanced preamplifier (eg G01 Control Unit) G01 Control Unit G56/G57 PRE OUT OFF AUDIO LEAD AUDIO LEAD • Switch the BRIDGE MODE switch to the OFF position. You should either use a twin-screened audio cable, or a pair of single-screened audio cables. • Connect the UNBALANCED sockets on the power amplifier to the outputs from the preamplifier. • Switch the channels to the UNBALANCED position. To connect to a balanced
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1 2 I n s t a l l i n g t h e p o w e r a m p l i f i e r To connect to each channel of a G68AXV or G68XXV Digital Surround Controller G68AXV/XXV Digital Surround Controller G56/G57 SIDE LR REAR LR A/B LR LEFT RIGHT CENTRE SUB ON 2 x G56/G57 Two-channel Power Amplifiers Three G56 or G57 Two-channel Power Amplifiers can be used in bridge mode for each of the front channels of a G68AXV or G68XXV Digital Surround Controller, which are provided as balanced outputs. • Switch the BRIDGE MODE swit
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1 3 I n s t a l l i n g t h e p o w e r a m p l i f i e r Outputs G55 Five-channel Power Amplifier ���������������������� �������������� ������������������������������������ ������������������� ������������������� ������������������ ������������������ �� ��������� ��������� ������������������ ��������� ��������� ��������� ��������� ������������������ ����������������� ����� ����� ��� ��� � � � � � � ��� � � � � ��� ��� � � ����� ������ ������� �������������� ������� ������������� � ������ ����
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1 4 I n s t a l l i n g t h e p o w e r a m p l i f i e r To connect to passive loudspeakers L oudspeak er L o u d s p eak er G5 5 Five -c h a n n e l P o w e r A m p li f i er O F F O F F T r eb le T r e bl e B a ss /mi d Ba s s / m i d • Set the BRIDGE MODE switches to the OFF position. • Connect one of each pair of the red and black terminals from the appropriate channel of the power amplifier to the red and black terminals on the corresponding loudspeaker. To bi-wire to passive loudspeak
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1 5 I n s t a l l i n g t h e p o w e r a m p l i f i e r To wire to passive loudspeakers in bridge mode Loudspeaker Loudspeaker G55 Five-channel Power Amplifier ON ON Treble Treble Bass/mid Bass/mid INPUT INPUT You can wire channels 1/2 and 4/5 in bridge output mode, to obtain more than twice the power output. • Switch the BRIDGE MODE switches to the ON position. • Connect the supplied bridge mode links between the black (–) CHANNEL 1/2 and CHANNEL 4/5 terminals, as marked on the back pan
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1 6 I n s t a l l i n g t h e p o w e r a m p l i f i e r To bi-amp to two passive loudspeakers Loudspeaker Loudspeaker G55 Five-channel Power Amplifier OFF OFF Treble Treble Bass/mid Bass/mid INPUT INPUT Extremely high sound quality can be achieved using two separate channels of the power amplifier to drive the LF and HF units in each loudspeaker. • Switch the BRIDGE MODE switches to the OFF position. Important: Remove the links bridging the LF and HF terminals on the back of each loudspea