Dual Mono Integrated Amplifier User guide DI 150 Contents Contents of the DI 150 box Safety instructions Warning: Never: Always: About the GamuT DI 150 Design considerations Electrical circuits considerations Unpacking Placement Connecting to the mains Connecting to other equipment Inputs Outputs How to operate Selecting a source Adjusting the listening level Mute function HTH Direct Recording from an input source The remote control Overview Functions Burn-in and warm up Burn-in Warm up Maintenance Service The protection circuitry - a second of silence Technical information Every musical note... 3 4 4 4 4 5 5 5 5 6 6 6 6 7 8 8 8 8 9 9 10 10 11 12 12 12 12 12 13 14 15 2 Contents of the DI 150 box · One GamuT DI 150 integrated amplifier · One mains cord with plug for either 115VAC or 230VAC · One GamuT RC1 amplifier/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 3 DI 150 Safety instructions Warning: · To prevent fire or shock hazard, do not expose this appliance to rain or moisture. · No user serviceable parts inside. Refer servicing to a qualified technician. Never remove the cover unless qualified 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 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 amplifier 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 "field" 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 amplifier 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 amplifier. Please be careful not to place the amplifier 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 amplifier, especially 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 modifications should be considered unsafe and may cause damage to both the amplifier and any connected equipment. Warranty is annulled by any form of modification 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 refinement of the mains cable has influence 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 amplifier's front right corner. Before switching on the amplifier, make sure that volume is reduced to or near zero. After switching on the amplifier, you will hear two small clicks from inside the amplifier 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 amplifier 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. 1. Ground 2. Positive 3. Negative 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 amplifier 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 fixed level that follows the actual input level with unity gain. It also has its own buffer amplifier, so that the recording device load does not disturb the main signal path. 7 DI 150 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 In the middle of the DI 150 front panel you will find 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 efficiently 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. The Mute function can also be enabled and disabled by the remote control, please refer to the section "remote control". 8 HTH Direct This function is intended for cases where the DI 150 is connected to a surround preamplifier 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 amplifier. 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 amplifier, 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 conflict 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 output level will match the input level due to the internal buffer in GamuT DI 150. 9 DI 150 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+ Play Pause Stop Next track Previous track Fast forward Fast backwards Amplifier 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 first 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 amplifier to burn in by playing music with the loudspeakers connected for one hundred hours before critical listening is performed. Warm up Please allow the amplifier 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 influence 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. Sh ...