3
i
ual Mono Preampl
ifi
e
r
User guid
e
2
D 3i
Contents
Contents of the D 3i box 3
Safety instructions 4
Warning: 4
Never: 4
Always: 4
About the GamuT D 3i 5
Design considerations 5
Electrical circuitry considerations 5
Unpacking 5
Placement 6
Connecting to the mains 6
Connecting to other equipment 6
Inputs 6
Outputs 7
XLR pin connection of the balanced in- and outputs 7
How to operate 8
Selecting a source 8
Adjusting the volume 8
Mute function 9
Dim function 9
Bypassing the CD input 9
Connecting to a surround processor 10
The remote control 11
Overview 11
Functions 12
Burn-in and warm up 13
Burn-in 13
Warm up 13
Maintenance 13
Service 13
Technical information 14
Every musical note… 15
3
Contents of the D 3i box
One GamuT D 3i Preamplifi er
One mains cord with plug for either 115VAC or 230VAC
One GamuT RC1 amplifi er/CD-player remote control unit
Two AAA batteries
Sandgaardsvej 31
DK-7400 Herning
Denmark
Telephone no: +45 70 20 22 68
Fax no: +45 59 43 97 26
www.gamutaudio.com
info@gamutaudio.com
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4
D 3i
Safety instructions
Warning:
To prevent fi re or shock hazard, do not expose this appliance to rain or moisture.
No user serviceable parts inside. Refer servicing to a qualifi ed technician. Never remove the
cover unless qualifi ed to do so. This unit contains dangerous voltages.
Never:
Let children (or grownups) push anything into holes or slots in the case - this could result in
harmful electrical shock and could cause damage of the equipment.
Guess or take chances with electrical equipment of any kind - it is always better to be safe than
sorry.
Obstruct the necessary all-around ventilation: especially DO NOT place the set close to curtains
or on soft furnishing such as carpets. Overheating can cause unnecessary damage and shorten
the lifespan of the equipment.
Always:
Read the user manual and familiarise yourself with the functions before you attempt to use this
equipment.
Ensure that all electrical connections (including the mains plug, extension leads and interconnections between pieces of equipment) are properly inserted and set in accordance with the
manufacturer’s instructions.
Check that the GamuT D 3i mains fuse rating is set correctly for your local mains voltage. Please
see the label at the rear next to the mains inlet.
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About the GamuT D 3i
Design considerations
The cabinet is of a rigid construction using massive and genuine high-grade materials, mostly aluminum. The use of non-magnetic materials is a vital foundation for ultra clean high-end reproduction of
music.
It also contributes to the touch and feel factor and is essential for a long lasting life even in a tough
environment.
A GamuT product is built to be used daily and we expect our products to be in the “fi eld” for many
years to come.
Under normal circumstances the D 3i should not need inspection or service for quite a while.
Should you experience break down or worn parts, these are easily replaceable or repairable and our
service partners around the world would be happy to help.
Electrical circuitry considerations
All components used in the D 3i are of the highest quality and have been selected through intensive
listing sessions from the PCB itself over the non-magnetic chassis to the legendary Neutrik XLR connectors.
The D 3i is based on following GamuT specialties:
Dual Mos-fet hybrid in-and output buffer
Soft coupled feet suspend the complete chassis
Internally shielding separates the cabinet for power supply and amplifi er section
Dual mono construction with separate power supply for each channel
Very powerful power supply with high bandwidth and low impedance
Unpacking
Carefully cut open the box with a knife. Remove the cables from the carton and lift up the D 3i from
inside the box. Remove the protective plastic enclosing the amplifi er. Please be careful not to place
the D 3i on the front panel or bend the various terminals on the backside when doing so.
Please keep the packaging material in a safe place as it might come in handy later.
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6
D 3i
Placement
The D 3i will get hot during use. It is important that it has free space all around the player, especially
sides and the top.
Please make sure that there is at least 10 cm (4 inches) of free space all around the preamplifi er.
Connecting to the mains
Your D 3i has been especially made for the country to which it has been shipped. Any attempt to
change the voltage or other types of modifi cations should be considered unsafe and may cause dam-
age to both the amplifi er and any connected equipment. Warranty is annulled by any form of modifi -
cation performed by any person not authorised by GamuT.
Connect the D 3i to the mains supply with the supplied IEC mains cable.
For further improvements to the level of sound quality, various types of mains cable type may be
tested. Like the importance of any other cable in the system, the quality and refi nement of the
mains cable has an infl uence on the total balance of the sound. Please feel free to experiment with
the various brands available in your country. Please note that GamuT cannot accept responsibility
for damage incurred due to improper usage, connection, or manufacture of other cables than the
enclosed.
The mains switch is located underneath the amplifi er’s front right corner. When the amplifi er is
switched on, the display will light up and you will hear two small clicks from inside the amplifi er.
Connecting to other equipment
The GamuT D 3i features several types of in and outputs:
Inputs
Four unbalanced inputs:
RIAA
Tuner
HTH
Tape
One balanced input
CD
Please note that all connectors of the D 3i are gold plated . This is done to ensure long lasting and
stable connections. Do only use cable and connectors either gold or silver plated.
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All of the inputs are line level inputs. If a turntable is to be connected, a special RIAA amplifi er must
either be fi tted as a plug-in module or an external must be connected in between the turntable and
the D 3i.
The HTH input also features a “direct” function. Please refer to the section “How to operate”.
The balanced input labeled “CD” can be used for any balanced signal source such as a CD player or
a separate D/A converter. You can also use them with a pair of RCA female/XLR male adaptors for
further connection of unbalanced sources.
Outputs
What goes in must come out!
The D 3i offers you plenty of option when connecting:
One pair unbalanced signal line out
Two pairs of balanced signal line out
One tape out
The two balanced line outputs, enables you to connect the D 3i to one or two external power amplifi ers. Giving you the option of bi-amping or to drive a second pair of loudspeakers simultaneously.
You can also use either the unbalanced or one of the balanced outputs to feed an active subwoofer. In
any case - the signal of the output follows the selected level and source.
The tape out is intended to be used for an analogue recording device. It has a fi xed level that follows
the actual input with unity gain.
Tape out features a separate buffer amplifi er, so that the recording device load, does not disturb the
main signal path.
The D 3i features one set of balanced input and two sets of balanced outputs. GamuT follow the
international IEC standard for the balanced connections; please ensure that the connected equipment
complies with the following pin confi guration:
XLR pin connection of the balanced in- and outputs
Ground
Positive
Negative
Some other brands have pins # 2 and 3 reversed. They will work together with the D 3i, but the absolute phase will be reversed. You can solve this by reversing the wires in the male plug of your balanced interconnects
The two balanced stereo outputs are connected together; exactly the same signal and level will be
available at both outputs. This enables you to bi-amp your loudspeaker with two power amplifi ers or
listen to music in a second room.
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8
D 3i
How to operate
Turning on the power is done using the main switch; at right hand lower corner just behind the front
panel.
By turning on the mains supply, the display will
illuminate. In the top row different input sources will appear. The row at the bottom will show
the functions of the three knobs just below the
display. A dot below each text will show which
inputs and function currently is selected and in
use.
Selecting a source:
Selecting the desired input source is achieved
by turning the big knob on the left side of the
D 3i and toggling through the inputs. A blue dot
below each name of the input indicates the
selected one. Turning the knob further after
reaching end of the row, will make the dot jump
to the other end of the input row.
Adjusting the volume
The large knob on right side of the front panel
controls the volume. On the outside of the knob
a small dot in the indicates the level setting.
The scale goes from approx. 8 o’clock minimum
to approx 4 o’clock as maximum output level.
The output level can also be adjusted by the
remote control, please refer to the section
“Remote control”.
Please note: We have selected an expensive ALPS dual logarithmic potentiometer for setting the
listening level. To reduce noise, we have chosen a 1kOhm version. Such a potentiometer cannot make
the sound disappear completely, even when you turn it down to the lowest setting. If complete silence is required, enable the Mute function as described on the next page.
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Mute function
The D 3i preamplifi er features a mute function
that will effi ciently mute the selected signal.
Push the Mute button to activate the Mute function.
The blue dot indicating the selected source is
now replaced by a dot indicating the mute function is enabled.
Push the Mute button again to disable the Mute
function and return to the previously selected
source and level. For your comfort and the
safety of your equipment, please ensure beforehand that the volume knob has not accidentally been
adjusted further towards the maximum output setting before you disable the Mute function.
The mute function can also be enabled and disabled by the remote control, please refer to the section “Remote control”
Dim function
The Dim function enables you to dampen the
brightness of the display or to turn it off.
Push the Dim button once and the brightness
will be reduced to around 50% of full level.
Push it again and only a blue dot indicating that
the Dim function is enabled will show.
A third push reactivates the whole display to full
level of brightness.
The Dim function can also be enabled and disabled by the remote control, please refer to the
section “Remote control”
Bypassing the CD input
Some CD players and other sources have built a
in volume control. The D 3i offers the possibility
of bypassing all analog treatment of the input by
directing the input straight to the output. Doing
so gives you the vey shortest and cleanest signal
path available.
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D 3i
To enable this function, you must do two things:
First of all: Press the little switch labeled Bypass
downwards, it is located at the back of the D 3i
just beside the CD input.
Secondly:
While the CD input source has been chosen,
you press the push knob just below the display
Bypass.
Now the dot below CD will move below Bypass
and the signal goes directly into the power
amplifi er. Please note that the volume control
of the D 3i is no longer in use and if you are not
very careful you might experience a full level
output!
When the Bypass function has been enabled the
source selecting route is changed. Instead of
selecting CD input the Bypass dot will light. See
illustration:
Connecting to a surround Processor
HTH Direct function is intended for cases where
the D 3i is connected to a surround preamplifi er
or processor. Enable the Direct function by pushing the small switch situated at the left side of
the HTH input terminals on the backside of the
preamplifi er.
The Direct function of this input will bypass the
volume control and lead the signal directly to
the output of the D 3i. This converts the D 3i
into a non-amplifying and non-level adjusting
device. Leading the two front channels of a surround system directly into your power amplifi er.
Please note: While the HTH Direct is enabled
and the HTH input is selected, the volume
control volume will be disabled to avoid confl ict
with other remote control systems.
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The remote control
Overview
Open/close
A-B repeat
Repeat one/all
Program (CD 1 only)
Display dim
Remain (CD 1 only)
Direct track selection 1-10 / 10+
Play
Pause
Stop
Next track
Previous track
Fast forward
Fast backwards
Volume up
Volume Down
Next source toggle
Previous source toggle
Mute
Standby
Phase
CD player functions:
Amplifi er functions:
Buttons present, but not in use:
12
D 3i
Functions
Volume up
By pushing this button the volume control knob will turn and the little dot indicator will rotate
clockwise. Holding the button down will eventually make the knob turn all around to maximum
level.
Volume Down
This button will do the exact opposite of the volume up button. Push the button down, until a
pleasant level is reached.
Next source toggle
By pressing the arrow up button the next input source will be selected according to the following
order:
- RIAA – Tuner – CD – HTH – Tape -
When it reaches the last source Tape, it will start over again by selecting the RIAA input.
Source toggle previous
The arrow down button will switch the previous input source as follows:
- Tape – HTH – CD – Tuner – RIAA –
When it reaches the last source RIAA, it will start over again by selecting the Tape input.
Mute
To enable Mute, push the mute button once. Push it again and the function is now disabled.
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Burn-in and warm up
Burn-in
All new electronic equipment must be burned in to achieve optimum performance. Please allow the
new amplifi er to burn in by playing music with the loudspeakers connected for one hundred hours
before critical listening is performed.
Warm up
Please allow the amplifi er and other audio equipment to warm up prior to serious listening. Expect at
least one hour of warming before optimum performance can be achieved.
Maintenance
To ensure long-lasting durability and to prevent magnetic infl uence on the electronics, the cabinet is
made from stainless steel and aluminum.
For cleaning the cabinet, use a dry cloth and wipe dust away. If needed, moisturise the cloth with a
small amount of window cleaning dissolvent.
Be very careful not the scratch the mirror display at the front.
Do not use any other type of cleaning material or polish, as you may destroy the cabinet’s protective
coating.
Service
The simplicity of the GamuT D 3i means that very few parts can break down.
Should you ever require service, you can either contact your dealer or national distributor, who can
solve any problems locally.
You are also very welcome to contact GamuT International A/S directly if you need any information or
help.
Our contact information is listed on the last page of this user guide.
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D 3i
Technical information
10Vrms @ 1% THD+N (Balanced)
5Vrms @ 1% THD+N (Unbalanced)
10Vrms @ 1% THD+N (Balanced)
5Vrms @ 1% THD+N (Unbalanced)
110dBA
<0.0008% (2Vrms)
5dB
20kOhm (Unbalanced)
40kOhm (Balanced)
75Ohm (Unbalanced)
150Ohm (Balanced)
1.Ground
2.Positive
3.Negative
115VAC / 230VAC
20W
111 x 431 x 420 mm (H x W x D)
12Kg
Maximum input level
Maximum output Level:
Signal to noise ratio:
THD+N:
Gain:
Input impedances
Output impedances:
XLR pin information:
Mains:
Power consumption:
Dimensions:
Shipping weight:
15
Every musical note…
Congratulations! You have just invested in one of the fi nest preamplifi ers available!
Many years ago, we chose the word “GamuT” to be our company name. This single phrase in Latin
means ‘a complete array’ or ‘an all-encompassing spectrum’. In our case, it refers to the entire
range of musical notes.
The GamuT name therefore fi ts our philosophy perfectly: Our goal is not missing out on one single
element among the myriads of tiny bits of information that create a realistic sound experience.
There are many more things to reproducing music than just reproducing the individual musical tones.
But it is the complex spectrum of multiple individual tones created by the musicians’ instruments and
voices, and not least the refl ected signals thereof that create the sounds we detect with our ears and
send to our brain to give us the wonderful sensations only music is capable of. It is Gamut´s mission
to give to you these unique musical feelings.
As with every GamuT product, our amplifi ers are designed with the capability of giving you the best
possible musical experience, which is synonymous with reproducing all of the essential information in
the recording to create the illusion of “being there”.
To ensure this, we use only the best “raw materials” trimmed and crafted to perfection by the best
engineers and sound enthusiasts in the industry.
Following the guidance lines in this manual will assure you of an exquisite sound experience, so be
ready for “the entire range of musical notes”
We wish you years of proud ownership and happy listening. We feel confi dent that you will cherish
this amplifi er for both its amazingly clear reproduction as well as for its splendid craftsmanship and
beautiful appearance.
Should you have any questions or other matters that you would like to share with us, then please do
not hesitate to get in touch with us. We will look very much forward to hearing from you.
Best wishes
Sandgaardsvej 31
DK-7400 Herning
Denmark
Telephone no: +45 70 20 22 68
Fax no: +45 59 43 97 26
www.gamutaudio.com
info@gamutaudio.com
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