Goldmund METIS ONE User manual

USER MANUAL

GOLDMUND METIS ONE

Universal Power Amplifier

GOLDMUND METIS ONE – Universal Power Amplifier - 2

Thank you for purchasing the GOLDMUND Metis One. The Goldmund Metis line amplifiers fully

incorporate the technological expertise developed by our company throughout the years.

Please take some time to read this manual. It will provide you with useful information to make your

pleasure of listening to the Metis One even higher.

INTRODUCTION

GOLDMUND METIS ONE - Universal Power Amplifier

Goldmund was founded in 1978 and has ever since been dedicated to the accurate reproduction of

sound and image.

At Goldmund, we strive to lead in the creation, development and manufacture of the industry’s most

advanced technologies, including audio and video systems, home - networking and music

distribution.

The guiding principle at Goldmund is to produce a precise sound with the least possible loss of

quality through the different stages. Goldmund will never adopt a technology before it is sufficiently

developed to satisfy the high quality standards we set. This is why Goldmund has often rejected

mainstream technologies and developed its own.

GOLDMUND METIS ONE – Universal Power Amplifier - 3

Table of Con en s

UNPACKING 5

CHOICE OF AMPLIFIER LOCATION 5

LINE VOLTAGE 6

CONNECTIONS 6

AMPLIFIER CONTROLS 7

SOUND QUALITY OPTIMIZATION 7

SAFETY AND PRECAUTIONS 9

MAINTENANCE 9

TECHNICAL DATA 10

GOLDMUND METIS ONE – Universal Power Amplifier - 4

W A R N I N G !

W A R N I N G !W A R N I N G !

W A R N I N G !

No connection or manipulation must be done

before reading those instructions. Damage of

the amplifier may result if the following

instructions are not consciously understood and

applied.

These extremely high quality amplifiers possess

new technical features which are a necessity for

accurate sound reproduction in the best audio

systems.

Only careful installation and use can provide the

satisfaction you are expecting.

The installation instructions must be carried out

in full and the mentioned precautions taken to

get the expected result and to avoid impairing

the amplifier’s performance.

GOLDMUND METIS ONE – Universal Power Amplifier - 5

1 UNPACKING

You will find in the Goldmund Metis One box:

•The amplifier

•The power cord

•This manual

Unpack the above-mentioned parts carefully.

Please keep the packaging in case you need to transport the amplifier at a later date or

if you have to send it for maintenance.

2 CHOICE OF AMPLIFIER LOCATION

The Goldmund Metis One amplifier, as all the high quality amplifiers, may generate a

large amount of heat if driven at high power.

It is mandatory to allow a proper cooling of the heat sink.

Avoid any location which is not properly ventilated and avoid putting other equipment on

top of the amplifier.

ATTENTION:

If you need to return the

Metis One to the factory or to your local

representative for a warranty repair,

please note that it must be repacked in

the original packaging.

This packaging has been designed

specifically to protect your Metis One in

transit. Use of alternative packaging is

likely to result in damage, invalidating

warranty cover.

GOLDMUND METIS ONE – Universal Power Amplifier - 6

3 LINE VOLTAGE

The Goldmund Metis One amplifier is preset at the factory for your country's voltage. It

functions with AC voltages between either, 200V and 245V, or, 95V and 125V.

If your AC line is usually out of these tolerances, please consult your local Goldmund

dealer.

Please check the value of the mains line fuse. This fuse is located in the power cord

receptacle. The lid can be removed with a small screwdriver when the cord is removed.

Use a 3.15A slow-blow fuse.

4 CONNECTIONS

Check if volume control is down to zero on the preamplifier.

You have two possibilities to connect your Universal Power Amplifier:

•Connect the analog output of your analog preamplifier to the analog input of the

Goldmund Metis One.

•Connect the digital output of your digital preamplifier to the digital input of the

Goldmund Metis One.

Connect the speaker cables to the red and black terminals accessible at the back of the

amplifier.

You may notice that the ground of the input and the black speaker terminal are of the

same polarity. The amplifier is non-inverting in phase.

Then, connect the power cords to the back of the amplifier and plug it in the nearest wall

plug. Use a 3 lugs grounded plug, for safety reasons. To get the best sound of the

amplifier, avoid multiple plugs or extension cords.

ATTENTION:

The Metis One does not

have an input selection switch. Only one

input can

be used at once.

GOLDMUND METIS ONE – Universal Power Amplifier - 7

5 AMPLIFIER CONTROLS

On the front plate of the Goldmund Metis One Amplifier you will find only one switch

used to power the amplifier ON and one power LED.

When turned ON the channel is connected after a few seconds and the front panel

“POWER” LED lights up.

The amplifier may be powered OFF by turning off the “POWER” switch at any time. The

LED will fade very slowly, indicating discharge of the filter capacitors. The speakers will

be disconnected almost immediately.

6 SOUND QUALITY OPTIMIZATION

Warm

WarmWarm

Warm-

-up sonic effec

up sonic effecup sonic effec

up sonic effec

If the power amplifier has not been powered on for a few days, the optimum sound

quality is reached after 15 minutes. This delay has been optimized to be minimal and the

sonic quality when just powered on is much higher than other quality power amplifiers.

GOLDMUND METIS ONE – Universal Power Amplifier - 8

6 SOUND QUALITY OPTIMIZATION (C d.)

Speaker polari y

Speaker polari ySpeaker polari y

Speaker polari y

Even if you have an absolute phase inverter on your preamplifier, and even if you have

carefully selected the proper line phase (see in next section), there is a possibility to

again increase the sonic quality of your speakers by reverting the polarity of each

speaker cable at amplifier termination. But since the line phase and the speaker polarity

interfere to each other, you have to experiment carefully with all the combinations before

picking the right one.

If your preamplifier has an absolute phase inverter, this will interfere too. If it does not

have an absolute phase inverter, do not forget the result will depend on the source, as

most records and CDs have been recorded without care for the absolute phase. Be

patient…

Mains line

Mains line Mains line

Mains line phase inversion

phase inversionphase inversion

phase inversion

The sonic quality of your Goldmund Metis One can be greatly improved if the mains AC

line is properly connected. Try to invert the AC plugs of both your amplifiers, using

special adapters.

We recommend that you try this carefully. You must do it in combination with the

speaker polarity and/or with absolute phase switching to be sure of the best

result.

GOLDMUND METIS ONE – Universal Power Amplifier - 9

7 SAFETY AND PRECAUTIONS

Pro ec ion

Pro ec ionPro ec ion

Pro ec ion

of he circui

of he circuiof he circui

of he circui

The Goldmund Metis One is a DC-coupled amplifier without protection. If it is associated

with a badly designed or defective analog preamplifier (often true for tube preamplifiers

and some 5 channel processors) the speakers could easily be damaged by the DC.

The Metis One doesn’t amplify DC but DC applied at the input is passed to the output.

This protection circuit is totally transparent and has no sonic effect.

If one output is short-circuited by accident, the amplifier will source too much current.

Such accident should be limited over time to avoid excessive heat. Build-up occurring.

This is not covered by the warranty.

8 MAINTENANCE

The Goldmund Metis One amplifier usually requires no maintenance.

To clean your amplifier, use a very soft, clean, damp cloth to avoid scratching the

surface. Dampen with water or a mild detergent solution. Avoid abrasive or harsh

cleansers (e.g. products containing sodium carbonate).

Always turn the power OFF before cleaning your amplifier.

ATTENTION:

the Goldmund Metis One is an

extremely high speed amplifier.

Any bad ground connection can generate high

frequency oscillations which are dangerous for

the tweeters.

It is also generally dangerous to run analog input

cables and speaker cables in parallel for a long

distance. If these cables are not of high quality or

badly shielded, an “Antenna-Effect” can generate

dangerous high-frequency oscillations.

GOLDMUND METIS ONE – Universal Power Amplifier - 10

9 TECHNICAL DATA

POWER SUPPLY:

POWER SUPPLY: POWER SUPPLY:

POWER SUPPLY:

•1 toroidal transformer

•1 power supply

•Power cord socket (3 lugs).

•Main Fuse (3.15A slow-blow)

FRONT PANEL CONTROLS:

FRONT PANEL CONTROLS:FRONT PANEL CONTROLS:

FRONT PANEL CONTROLS:

•ON/OFF Switch

•Green LED for power

REAR PANEL CONNECTORS AND CONTROLS:

REAR PANEL CONNECTORS AND CONTROLS:REAR PANEL CONNECTORS AND CONTROLS:

REAR PANEL CONNECTORS AND CONTROLS:

•Power cord socket 3 lugs

•Main fuse (3.15 A slow-blow)

•1 Analog Input RCA connector

•1 Digital Input RCA connector

•1 pairs of output speakers connector (left and right)

GROUNDING

GROUNDINGGROUNDING

GROUNDING

•Separated ground and earth signal

•Connection between earth and ground to cancel all ground loops

SAFETY FEATURES

SAFETY FEATURESSAFETY FEATURES

SAFETY FEATURES

•Automatic switching to MUTING if the AC line drops or is interrupted

POPO

POWER

WERWER

WER

•Power RMS (Goldmund FPP Standard): 150W on 8 Ohms

•Peak Power/Maximum voltage: 275W on 8 Ohms

•Nominal line voltage: 110 or 230 V

•Input voltage range: +/- 10 %.

•Maximum power consumption: 300 W

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