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Summary of Contents for Nimbus Water Systems ARI-R1
- Page 1 Arcus Integrated Amplifer Owner’s Manual 2017.08 Edition ©2016, 2017 Nimbus Electronics Sàrl...
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Page 2: Foreword
FO R E W O R D We would like to thank you for your purchase of the Arcus amplifer! This product has been entirely developed, assembled and tested in Switzerland using the highest quality parts, providing you not only with a superlative listening experience but also the assurance of trouble-free operation for the years to come. -
Page 3: Unpacking
U N PAC K I N G Installing and connecting your amplifer is straightforward and the following steps will assist you in getting it up and running in a short amount of time. The Arcus amplifer is composed of two units: The Amplifer Unit •... -
Page 4: Amplifer Unit
A M P L I F I E R U N IT Arcus Integrated Amplifer Owner’s Manual Page 4... -
Page 5: Power Supply Unit
P O W E R S U P P LY U N IT Arcus Integrated Amplifer Owner’s Manual Page 5... -
Page 6: Location
LO C AT I O N The vacuum tubes used in the Arcus amplifer generate a signifcant amount of heat during operation and good ventilation is of utmost importance for safe, long-term operation. Please follow the rules below to provide your amplifer with adequate cooling: Always install the amplifer on a fat, non heat sensitive •... -
Page 7: Vacuum Tubes Installation
VAC U U M T U B E S I N S TA L L ATI O N For your safety Never operate the amplifer without the Plexiglas protection screen: the vacuum tubes are very hot in operation. Always wait at least 30min. to allow the vacuum tubes to cool down before removing the protection screen. -
Page 8: Tube Set Removal Steps
Tube set removal steps Switch off the amplifer and disconnect the power cord from • mains. Wait at least 30 min. for the tubes to cool down. • Use the provided tool to remove the six M3 screws that keep •... -
Page 9: Audio And Power Connections
AU D I O A N D P O W E R C O N N E CT I O N S For your safety Never attempt to connect or disconnect the power cables between the power supply and amplifer units when the supply is connected to the mains and powered up. -
Page 10: Audio Input Connections
To ensure a correct connection, chassis sockets are labelled A and Connect one cable from connector A on the amplifer to • connector A on the power supply unit Connect the second cable from connector B on the amplifer • to connector B on the power supply unit Follow these steps to connect the power supply and amplifer units: Ensure the mains power cord isn’t connected to the power... -
Page 11: Speaker Connections
connect balanced source equipment as this will provide the optimal operating conditions for the input transformers. It is also worth noting that unbalanced sources have a signal level that is 6dB lower than balanced ones and the volume control will have to be increased by the same amount. - Page 12 Congratulations, you’ve completed the installation of your amplifer! Arcus Integrated Amplifer Owner’s Manual Page 12...
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Page 13: Powering Up
P O W E R I N G U P For your safety Only connect the power supply to a mains connector that provides the appropriate voltage rating as indicated on the back of the power supply unit! Risk of electrocution, of fre and damage to the amplifer! Always replace the fuse with one of the same value as indicated on the back of the... - Page 14 As shipped from the manufacture, the amplifer will be confgured for 6L6GC tubes which are the standard provided set. If you have purchased an optional tube kit or if the displayed profle doesn’t match the tubes that you installed, please read the Settings and the Tube Rolling sections to learn how to confgure the amplifer for the installed tubes.
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Page 15: Amplifer Controls
A M P L I F I E R C O NT R O L S The amplifer operation can be controlled using both the infrared Remote Control or the Rotary Control button on the amplifer itself. Using the Rotary Control The rotary control is the round button on the front right side of the amplifer. - Page 16 Install the battery in the battery holder, pay attention to the • polarity. Slide the back plate in and push until it clicks in place. • The remote control is now ready to be used. Arcus Integrated Amplifer Owner’s Manual Page 16...
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Page 17: Operating The Amplifer
O P E R AT I N G T H E A M P L I FI E R The OLED display on the left side of the amplifer indicates all the important parameters and current operating conditions. Holding the Select button pressed (Hold action) will power off the amplifer at any time irrespective of the mode it is Stand-by In this state the amplifer is connected to... - Page 18 Play Mode In this state the amplifer is ready to reproduce audio from the selected input. The top of the screen indicates the currently active audio input. The volume attenuation in dB is indicated in the middle of the screen. Increase / decrease: adjust the •...
- Page 19 Audio Balance Setting When in the Input Selection state, advancing the selection cursor to the right, beyond Input 4, will bring up the audio balance setting. This allows left / right balance to be corrected by up to 9dB in each direction. Increase / decrease: adjust balance •...
- Page 20 Settings Menu The settings menu allows amplifer parameters to be modifed and saved to the non volatile memory so changes made to the settings will not be lost when power is removed. Increase / decrease: select the setting • to adjust. The current value for that setting is displayed in the bottom section of the display.
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Page 21: Tube Rolling
T U B E R O L L I N G The Arcus amplifer allows several tube types to be installed to tailor the sound signature to your tastes. There are two sorts of tubes used in by the amplifer, each with a specifc function: Two 6SN7 tubes for the voltage amplifcation •... - Page 22 6P3S tubes. Other tubes are also compatible with adapters so in case of doubt, please contact us. As 6L6 tubes come with vastly different plate dissipation ratings, it’s very important to select the correct tube profle for the installed tubes. In particular, the older NOS 6L6 tubes are rated for lower voltages and power than modern 6L6GC tubes and will suffer catastrophic failure if used with the incorrect profle.
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Page 23: Firmware Updates
F I R M WA R E U P DAT E S The sophisticated functionality of the Arcus amplifer is supervised and made possible by a micro-controller running in-house designed software. In order to beneft from new features that might be released in the future, the amplifer can be upgraded using the USB port located on the internal left hand side behind the Plexiglas protection panel. -
Page 24: Faq
There is no power... Check that the power cables between the power supply and the • amplifer units are connected, connectors are seated correctly and screwed in fully. Check that the A and B connections aren’t inverted between the • power supply and amplifer units. -
Page 25: Why Is A Warm-Up Time Required
switching devices, relays introduce no alteration of the audio signal. The drawback is that they make a clicking sound when they are operated which we feel is a small price to pay for not introducing any unwanted signal alteration. As an additional refnement, the dual path volume control allows the volume to be smoothly adjusted without any noise until the desired listening volume is reached. -
Page 26: Specifcations
S P E C I F I C AT I O N S Input Input impedance 27 kΩ (balanced) Attenuation range -63..0 dB Sensitivity 2 V rms Voltage gain 14 dB Output Bandwidth 20..20000 Hz (+/- 1dB) Rated power A 27.5 (1kHz, 8Ω) AB 30.0 Distortion... -
Page 27: Additional Information
A D D ITI O N A L I N F O R M AT I O N Terms and Conditions Please check the terms and conditions before purchasing or operating the product. They are available on the Nimbus Audio website at http://www.nimbusaudio.ch/assets/cgv.pdf Operating Conditions... -
Page 28: Symbols
S Y M B O L S Caution! Make sure to follow the indications. Caution! Risk of electrical shock or death if instructions aren’t followed. Read the instructions manual. D I S P O S A L Do not dispose of this device together with household waste material! In observance of European Directive 2012/19/EU on waste electrical and electronic equipment and its... -
Page 29: Declaration Of Conformity
D E C L A R AT I O N O F C O N F O R M IT Y Product: Arcus Integrated Audio Amplifer Model: ARI-R1 We hereby declare that the product described complies with the following directives: 2014/35/EU (LVD) •... -
Page 30: Table Of Contents
Table of Contents Foreword......................2 Unpacking......................3 Amplifer unit.......................4 Power supply unit....................Location......................6 Vacuum Tubes installation.................7 Tube set removal steps......................8 Tube set installation steps.......................8 Audio and Power Connections................9 Power supply connections......................9 Audio input connections......................10 Speaker connections......................11 Powering up......................13 Mains power connection.......................13 Checking the tube profle.......................13 Amplifer controls.....................1 Using the Rotary Control......................15 Using the Remote Control.....................15...
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