Goldmund MIMESIS 27.3 Manual de usuario

User manual – Goldmund MIMESIS 27.3 – Analogue Preamplifier - 1 -

USER MANUAL

GOLDMUND MIMESIS 27.3

Analogue Preamplifier

User manual – Goldmund MIMESIS 27.3 – Analogue Preamplifier - 2 -

Thank you for purchasing the Goldmund MIMESIS 27.3, Analogue Preamplifier.

Please take some time to read this manual. It may provide you with useful information to

make your pleasure of listening to the MIMESIS 27.3 even higher.

INTRODUCTION

GOLDMUND MIMESIS 27.3 – Analogue Preamplifier

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.

User manual – Goldmund MIMESIS 27.3 – Analogue Preamplifier - 3 -

W A R N I N G!

No connection or manipulation may be done

before reading these instructions. Damage to

the Analogue Preamplifier may result if the

following instructions are not understood and

applied.

This high quality analogue preamplifier

possesses new technical features like ultra-high

bandwidth and computer linking which are

becoming necessary for an accurate

transcription of today’s best analogue

messages in complete systems with video,

computer and audio associated components.

Only a careful use can provide all the

satisfaction you are expecting.

All handling must be performed according to the

following instructions to avoid the preamplifier

deterioration.

Nevertheless, if the instructions are perfectly

carried out, you will notice that the use of the

Goldmund Mimesis 27.3 is quite simple and

convenient.

User manual – Goldmund MIMESIS 27.3 – Analogue Preamplifier - 4 -

CONTENTS

1. SETTING UP THE MIMESIS 27.3 5

2. FIRST INSTALLATION AND CONNECTIONS 6

3. FRONT AND BACK PANELS FUNCTIONS 7

4. SOUND QUALITY OPTIMIZATION 8

5.CLEANING 9

6. TECHNICAL DATA 9

User manual – Goldmund MIMESIS 27.3 – Analogue Preamplifier - 5 -

1 SETTING UP THE MIMESIS 27.3

Please read very carefully the following instructions. This high-precision preamplifier

will provide the best analog signal possible thanks to its unique circuitry.

For exacting technicians, musicians, and all amateurs who demand the very best in

recording transcription, we strongly recommend the use of a top quality D/A

converter or to get the D/A build-in option to decode the today’s high definition digital

signals.

The connections between the analogue sources and the preamplifier are also critical.

Ultra low reflection cables are absolutely mandatory. Goldmund recommends using

the special Goldmund Interconnect cables.

1.1. UNPACKING

You will find in the Goldmund Mimesis 27.3 box:

- The preamplifier

- The power cord

- The remote-control transmitter

- This manual

ATTENTION

Please keep the packaging in case you need to transport the MIMESIS 27.3 at a

later date or if you have to send it for maintenance.

This packaging has been designed specifically to protect the MIMESIS 27.3 in

transit. Use of alternative packaging is likely to result in damage, invalidating

warranty cover.

User manual – Goldmund MIMESIS 27.3 – Analogue Preamplifier - 6 -

1 SETTING UP THE MIMESIS 27.3

1.2. CHOICE OF THE PREAMPLIFIER LOCATION

The Goldmund Mimesis 27.3 preamplifier generates a significant amount of heat.

It is necessary to allow a proper cooling of the heat sinks. Avoid any location which is

not properly ventilated and avoid putting any equipment that is sensitive to

temperature on top.

1.3. LINE VOLTAGE ADJUSTMENT

A voltage selector is provided on the back plate of the preamplifier. Adjust it with a

screwdriver if the line voltage provided is not appropriate.

ATTENTION: On the 220V position, the Goldmund Mimesis 27.3 preamplifier will

function properly for main line voltage in between 200V and 240V. On the 110V

position, the main line must deliver between 105 and 125V. If your main line is

usually out of these tolerances, please consult your Goldmund dealer.

Please check the value of the main line fuse. This fuse is located on the power cord

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

removed.

Use a 500mA slow-blow fuse for 220V and 110V.

2 FIRST INSTALLATION AND CONNECTIONS

2.1. POWER CONNECTION

Connect the power cord to the back of the preamplifier and plug it into the nearest

wall plug. Use only a 3 lugs grounded plug, for safety and noise reasons. To get the

best sound of the preamplifier, avoid any multiple plugs or an extension cord.

User manual – Goldmund MIMESIS 27.3 – Analogue Preamplifier - 7 -

If the preamplifier is the logical center of your system and you use a star grounding

configuration, you may have to use the earth connection of the AC plug and lift the

earth connection of the other equipment. In such a case, connect together the earth

(yellow/green).

If you have to update the software, you will use the DB9 terminated cable provided

with this option to connect the Mimesis 27.3 to a computer serial output and follow

the instructions delivered with the software. This connector has to be left open in all

the other situations.

2.2. SOURCES CONNECTION

Connect the interconnects between the preamp analog outputs and the power amp.

You will plug the cables to the RCA female sockets noted outputs.

Connect the interconnects from the analogue source devices to the line inputs

number 1 to 5. With the D/A option connect the lineal cables from the digital sources

to the inputs number 6 to 8.

Note : a residual High Frequency noise may remain audible in some circumstances

when an input is left open and is selected. This disturbance has no effect on the

preamplifier but may be avoided easily by short-circuiting plugs applied to all the

unused inputs.

Connect the tape machines to input 5 and to the Tape output RCA plugs.

3 FRONT AND BACK PANELS FUNCTIONS

- Power:

On the back panel of the Goldmund Mimesis 27.3 preamplifier the switch is used to

power on the preamplifier. In regular use, this switch is left ON and the circuits of the

preamplifier are left ON. The standby function of the remote control is only shorting

the output to ground for safe removal of the cables to the power amplifier.

User manual – Goldmund MIMESIS 27.3 – Analogue Preamplifier - 8 -

The preamp can be powered off by switching the switch to the OFF position. A

special safety circuit switches the preamp to muting, to avoid any disturbance to

reach the power amplifier and the speakers, even if the preamplifier is disconnected

from the AC plug by accident.

However, to optimize the sound quality of the preamplifier and insure the best

reliability, Goldmund recommends that the unit is left powered ON.

- Muting:

Muting is controlled from the remote control. It can be used to temporarily turn the

volume down without touching the volume control. When returned to normal, the

level of the preamplifier is returned to where it was when the muting was activated.

- Volume:

May be adjusted manually by turning the volume control or on the remote by

VOLUME + or -.

- Selector:

Selects one of the (8 if D/A option is enabled, 5 if not) available input for listening,

including the one tape inputs for monitoring. A step clockwise is selecting the next

input; a step counterclockwise selects the previous input. A display on the front panel

shows the number of the input selected. Selection may be also made on the remote

by pressing the key corresponding to the input on the Analog section of the remote.

- Record:

Record is factory set. Tape in is always input 5. If input 5 is selected, tape out is

disconnected. Otherwise, tape out is connected to the selected input. E.g. input 3 is

selected, so tape out receive signal from input 3.

4 SOUND QUALITY OPTIMIZATION

- Warm-up sonic effect:

If the preamplifier has been left unpowered for a few days, the optimum sound

quality is only reached after many hours. This is why Goldmund recommends leaving

the MIMESIS 27.3 powered on.

User manual – Goldmund MIMESIS 27.3 – Analogue Preamplifier - 9 -

5 CLEANING

The Goldmund Mimesis 27.3 preamplifier usually requires no maintenance.

To clean your Mimesis, use a soft and slightly wet cloth. Always turn the power off

before cleaning your preamplifier.

6 TECHNICAL DATA

•OUTPUT LEVEL

- Nominal level: 2.25 V RMS.

- Maximum output level: 3.6 V RMS.

- Output stage output impedance: < 10 Ohms.

- Corrected output impedance: 75 Ohms.

•FREQUENCY RESPONSE

These values for any level to 3.6 V RMS.

- +/- 0.1 dB, 0 - 50 kHz.

- +/- 1 dB, 0 - 150 kHz.

- +/- 3 dB, 0 - 300 kHz.

•INPUT SENSITIVITY

- Nominal level: 2.25 V RMS.

- Saturation level: 3.6V RMS.

- Nominal input impedance: 50 kOhms.

•GROUP DELAY

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

•DISTORTION

Figures valid for all levels from 0 to 25 V.

- Dynamic: TID < 0.003 % (- 80 dB).

- Static: THD < 0.003 % (- 80 dB).

User manual – Goldmund MIMESIS 27.3 – Analogue Preamplifier - 10 -

6 TECHNICAL DATA

•SPEED

- Slew rate of the amplification stages: > 20 V/µs

- Rise time: < 700 ns.

•CROSSTALK

- Separation: > 90 dB between channels.

NOISE

- Signal-to noise ratio on line input : > 90 dB.

- Weighted ASA A > 100 dB.

•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).

•POWER SUPPLY

- Nominal line voltage: 117 or 234 V.

- Input voltage range: +/- 10 %.

- Maximum power consumption: 70 W.

•GROUNDING

- Separated ground and earth signal.

- Chassis connected to earth.

•SAFETY FEATURES

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

- Automatic protection against tape loops.

•FRONT PANEL CONTROLS

- VOLUME control.

- SELECTOR input switch.

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