Selecting a source 8
Adjusting the listening level 8
Mute function 8
HTH Direct 9
Recording from an input source 9
The remote control 10
Overview 10
Functions 11
Burn-in and warm up 12
Burn-in 12
Warm up 12
Maintenance 12
Service 12
The protection circuitry - a second of silence 13
Technical information 14
Every musical note... 15
2
Contents of the DI 150 box
One GamuT DI 150 integrated ampli er•
One mains cord with plug for either 115VAC or 230VAC•
One GamuT RC1 ampli er/CD-player remote control unit•
Two AAA batteries •
Siggaardsvej 2
DK-6818 Årre
Denmark
Tel: +45 70 20 22 68
www.gamutaudio.com
info@gamutaudio.com
3
DI 150
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 intercon-•
nections between pieces of equipment) are properly inserted and set in accordance with the
manufacturer’s instructions.
Check that the GamuT DI 150 mains fuse rating is set correctly for your local mains voltage. •
Please see the label next to the mains inlet.
4
About the GamuT DI 150
The DI 150 arises from the wish to combine two high-end audio components into one while compromising neither the quality of design nor the electrical circuits.
Our overall goal was to create the best sounding integrated amplifi er available.
Design considerations
The cabinet is of a rigid construction and uses massive and genuine high grade materials, such as aluminium and stainless steel. This does not only contribute to the touch and feel factor, but 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 DI150 should not need inspection or service for quite a while. The
capacitors, for instance, have a promised lifespan of 10 years without degrading.
Electrical circuitry considerations
All components used in the DI 150 are of the highest quality and have been selected through intensive
listing sessions from the PCB itself over the non-magnetic chassis to the WBT output terminals.
The DI 150 is based on following GamuT specialties:
Dual-FET hybrid input buffer•
Single power MOS-FET output circuit•
Extremely powerful power supply with high bandwidth and low impedance•
A unique protection circuit that ensures both the amplifi er and the loudspeakers will survive •
severe faults, that normally would lead to critical damage to either or both units
Unpacking
Carefully cut open the box with a knife. Remove the cables from the carton and lift up the DI 150
from inside the box. Remove the protective plastic enclosing the amplifi er. Please be careful not to
place the amplifi er 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.
5
DI 150
Placement
The DI 150 will get hot during use. It is important that it has free space all around the amplifi er, espe-
cially the sides and the top.
Connecting to the mains
Your DI 150 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 DI 150 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 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. Before switching on the
amplifi er, make sure that volume is reduced to or near zero. After switching on the amplifi er, you will
hear two small clicks from inside the amplifi er and possibly also one from each speaker.
Connecting to other equipment
The GamuT DI 150 features six signal level inputs and three available outputs;
Inputs
Four unbalanced inputs:
CD•
Tuner•
Tape•
HTH (bypass option)•
Two Balanced inputs:
Bal 1 •
Bal 2 •
Please note that all connectors of the DI 150 are gold plated. This is done to ensure long lasting and
stable connections. Only use cable and connectors either gold or silver plated.
6
All of the inputs are line level inputs. If a turntable is to be connected, a separate RIAA amplifi er
must used in between the turntable and the DI 150. You can use any of the inputs you like.
The HTH input also features a “direct” function. Please refer to the section “how to operate”
The DI 150 also features two sets of balanced inputs. We follow the international IEC standard for the
balanced connections; please ensure that the connected equipment complies with the following:
Pin connection of the XLR.
Ground1.
Positive2.
Negative3.
Some other brands have Pin 2 and 3 reversed. They will work, 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 inputs 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 adapters for further connection of unbalanced sources.
Please note that the adapters are not included in the standard packing, but are available at the dealers.
Outputs
What goes in must come out!
The DI150 offers you plenty of options when connecting:
One pair of unbalanced signal line out•
One pair of balanced signal line out•
One Tape out•
One pair of speaker out•
The unbalanced and the balanced line out, enable you to connect the DI150 to an external power
amplifi er to either bi-amp or drive a second set of loudspeakers. You can also use the line out 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 level with unity gain.
It also has its own buffer amplifi er, so that the recording device load does not disturb the main signal
path.
7
How to operate
Selecting a source
Select the desired source by pushing the button beside the name of the connected source.
A blue dot will light between the text and the
button to indicate the selected source. For example to the right the CD input is selected.
The input selection can be toggled with the
remote control, please refer to the section
“Remote control”
Adjusting the listening level
DI 150
In the middle of the DI 150 front panel you
will fi nd the large volume control knob. On the
outside parameter of the knob a small blue dot
lights up to indicate the level setting. Turn the
knob by hand to the desired level. The scale
goes from approx 8 o’clock minimum level 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 described below.
Mute function
The DI 150 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 as shown below.
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 button.
8
The Mute function can also be enabled and
disabled by the remote control, please refer to
the section “remote control”.
HTH Direct
This function is intended for cases where the DI 150 is connected to a surround preamplifi er or pro-
cessor. Enable the “direct” function by pushing the small switch situated at the left side of the HTH
input terminals on the backside of the amplifi er.
Small characters at the HTH display now indicate “direct”.
The “direct” function of this input will bypass
the volume control and lead the signal directly
the output stage of the DI 150. This converts
the DI 150 into a power amplifi er, driving your
front left and right loudspeakers in a surround
setup.
While the HTH “direct” is enabled and the HTH input is selected, the remote controlled volume will
be disabled to avoid confl ict with other remote control systems.
Recording from an input source
You can always record from the actual source selected using the Tape Out. Please note that the out-
put level will match the input level due to the internal buffer in GamuT DI 150.
9
The remote control
Overview
CD player functions:
Open/close
A-B repeat
Repeat one/all
Program (CD 1 only)
Display dim
Remain (CD 1 only)
Direct track selection 1-10 / 10+
DI 150
Play
Pause
Stop
Next track
Previous track
Fast forward
Fast backwards
Amplifi er functions:
Volume up
Volume Down
Next source toggle
Previous source toggle
Mute
Buttons present, but not in use:
Standby
Phase
10
Functions
Volume up
By pushing this button the volume control knob will turn and the blue level indicator dot 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:
- Bal 1 – Bal 2 – CD – Tuner – Tape – HTH -
When it reaches the last source HTH, it will start over again by selecting the Bal 1 input.
Source toggle previous
The arrow down button will switch the previous input source as follows:
- HTH – Tape – Tuner – CD – Bal 2 – Bal 1 -
When reaching the fi rst source Bal 1, it will then start over again by selecting the HTH input.
Mute
To enable Mute, push the mute button once. Push it again and the function is now disabled.
11
DI 150
Burn-in and warm up
Burn-in
All new electronics must be burned in to achieve its 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, moisten 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 DI 150 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.
12
The protection circuitry - a second of silence
The idea for the protection circuit come from our professional amplifi ers, where it has worked well
since 1982.
The protection circuit can detect:
DC errors •
high level subsonic signals •
long-term ultrasonic signals •
high temperature•
low impedance loads or short circuits •
If needed, the protection circuit will simply mute the input signal, and if necessary open the output relay. The relay will normally open only after muting the input signal to avoid relay switching of
strong currents that could damage the relay contacts.
In case of e.g. a short circuit, the input is muted for a second. Then a 1 millisecond long pulse is sent
out to test again. If the short circuit still is present, it waits a second and tries again, and so on. Less
than a second after the user has removed the faulty cable, the system will remove the muting.
The protection also detects too low impedance loads, and alerts the user by muting for a second. This
way, the user can be sure of hearing only clean non-distorted audio. The normal current limiting and
momentary distortions of the music are completely avoided in the GamuT DI150 power amplifi er.
You may experience a second of silence while the music is playing loudly. This is the protection acting
to protect your audio system. Any amplifi er will start to clip the top of the music if you exceed the
maximum power level. Technically, clipping generates a lot of high-frequency energy, which can burn
out the tweeters in your loudspeakers. The protection also constantly checks the energy above 20
kHz, which humans do not hear.
This means that the protection circuit can interfere even though you cannot hear any reason for this.
If you experience these seconds of silence, simply turn the output level down until the music plays
without interruption.
You can also provoke the subsonic protection by playing warped records without using a subsonic
fi lter. Please check your tone-arm/cartridge resonance frequency, which should be about 8-12 Hz to
reduce the effect of warped records.
13
Technical information
DI 150
Output power (@230V/115V):
Frequency range:
Speaker load:
Noise level:
THD:
Distortion:
Line input impedance:
Line output impedance:
XLR pin information:
180 Watt @ 8 ohms
360 Watt @ 4 ohms
20 – 22,000Hz +/- 0.1dB
<1.5 ohms
100dBA below 100W @ 8 ohms
<0.05%
Mainly 2nd harmonic, decreases with higher output level
20 k ohms unbalanced
40 k ohms balanced
75 ohms unbalanced
150 ohms balanced
1.Ground
2.Positive
3.Negative
Mains:
Idle power consumption:
Maximum power consumption:
Dimensions:
Shipping weight:
115VAC / 230VAC
100W
1000W
155 x 431 x 410 mm (H x W x D)
27 Kg
14
Every musical note…
Congratulations! You have just invested in one of the fi nest integrated amplifi 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.