Metis One manual - Goldmund

USER MANUAL 

GOLDMUND METIS ONE 

Universal Power Amplifier

INTRODUCTION 

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. 

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 - 2

Table of Contents 

1 UNPACKING 5 

2 CHOICE OF AMPLIFIER LOCATION 5 

3 LINE VOLTAGE 6 

4 CONNECTIONS 6 

5 AMPLIFIER CONTROLS 7 

6 SOUND QUALITY OPTIMIZATION 7 

7 SAFETY AND PRECAUTIONS 9 

8 MAINTENANCE 9 

9 TECHNICAL DATA 10 


W W A A R R R N N N I I N N N G 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. 


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. 

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: The Metis One does not 

have an input selection switch. Only one 

input can be used at once. 

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. 


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 Warm-up Warm up up sonic sonic effect 

effect 

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. 


6 SOUND QUALITY OPTIMIZATION (Ctd.) 

Speaker Speaker polarity 

polarity 

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 Mains line line phase phase inversion 

inversion 

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. 


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. 

7 SAFETY AND PRECAUTIONS 

Protection Protection of the circuit 

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. 


9 TECHNICAL DATA 

POWER POWER SUPPLY: 

SUPPLY: 

• 1 toroidal transformer 

• 1 power supply 

• Power cord socket (3 lugs). 

• Main Fuse (3.15A slow-blow) 

FRONT FRONT FRONT PANEL PANEL CONTROLS: 

CONTROLS: 

• ON/OFF Switch 

• Green LED for power 

REAR REAR PANEL PANEL PANEL CONNECTORS CONNECTORS AND AND CONTROLS: 

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 

GROUNDING 

• Separated ground and earth signal 

• Connection between earth and ground to cancel all ground loops 

SAFETY SAFETY FEATURES 

FEATURES 

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

PO POWER PO 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 


9 TECHNICAL DATA (Ctd.) 

FREQUENCY FREQUENCY RESPONSE 

RESPONSE 

• These values for any level to maximum output level 

• +/- 0.2 dB, 10Hz - 20 kHz 

• +/- 1 dB, 10Hz – 100 kHz 

• +/- 2 dB, 10Hz – 200 kHz 

CIRCUIT CIRCUIT SPEED 

SPEED 

• Slew rate of the amplification stages: 60 V/us 

• Rise time: < 500 ns. 

GROUP GROUP DELAY 

DELAY 

• Propagation delay < 1 ms stable with frequency from DC to 100 kHz. 

DISTORTION 

DISTORTION 

• With 100 mVrms output level, 80 KHz measurement bandwidth, 20 Ohms 

termination impedance 

• THD unbalanced in to balanced out 0.01 % flat with frequency 

• IMD unbalanced in to balanced out 0.05 % 

OPERATING OPERATING TEMPERATURE 

TEMPERATURE 

• Room temperature: -30 to +40 degrees Celsius (-22 to +104 degrees Fahrenheit). 

• Internal temperature: +45 to +65 degrees Celsius (+113 to +149 degrees 

Fahrenheit). 


9 TECHNICAL DATA (Ctd.) 

DIMENSIONS DIMENSIONS DIMENSIONS AND AND WEIGHT: 

WEIGHT: 

• Amplifier: 200 mm (7.9’) W x 325 mm (12.8’) D x 60 mm (2.35’) H. 

• Amplifier Box: 370 mm (14.5’) W x 370 mm (14.5’) D x 130 mm (5.1’) H. 

• Power Supply: 110 mm (4.3’) W x 110 mm (4.3’) D x 42 mm (1.65’) H. 

• Total Weight: 4 Kg (8.8 lb) 

• Total Weight with the box: 5 Kg (11 lb) 

WARRANTY: 

WARRANTY: 

• 3 years parts and labor 

Information and product specifications contained in this manual are subject to change 

without prior notice. Updated versions of this manual will be posted on our website at 

www.goldmund.com. 

Please visit our support page at http://www.goldmund.com/support/register to register 

your Goldmund product for warranty

Metis One manual - Goldmund

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