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.

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Table of Con en s
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

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.

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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.

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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.

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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.

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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.

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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.

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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
PO
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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9 TECHNICAL DATA (C d.)
FREQUENCY RESPONSE
FREQUENCY RESPONSEFREQUENCY RESPONSE
FREQUENCY 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 SPEED
CIRCUIT SPEEDCIRCUIT SPEED
CIRCUIT SPEED
•Slew rate of the amplification stages: 60 V/us
•Rise time: < 500 ns.
GROUP DELAY
GROUP DELAYGROUP DELAY
GROUP DELAY
•Propagation delay < 1 ms stable with frequency from DC to 100 kHz.
DISTORTION
DISTORTIONDISTORTION
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 TEMPERATURE
OPERATING TEMPERATUREOPERATING TEMPERATURE
OPERATING 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).

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9 TECHNICAL DATA (C d.)
DIMENSIONS AND WEIGHT:
DIMENSIONS AND WEIGHT:DIMENSIONS AND WEIGHT:
DIMENSIONS AND 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: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