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Owner's Manual
dm8
TABLE OF CONTENTS
IMPORTANT SAFETY INSTRUCTIONS............................................................. 2
INTRODUCTION .................................................................................................... 3
ELECTRONIC DESIGN..................................................................................... 4
MICROPROCESSOR CONTROL ..................................................................... 5
INDUSTRIAL DESIGN...................................................................................... 6
MECHANICAL DESIGN ................................................................................... 7
INSTALLATION....................................................................................................... 8
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FRONT PANEL CONTROLS ................................................................................. 9
REMOTE CONTROL ............................................................................................ 10
DISPLAY.................................................................................................................. 10
DISPLAY.................................................................................................................. 11
REAR PANEL ......................................................................................................... 12
CONNECTIONS..................................................................................................... 13
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OPERATING INSTRUCTIONS........................................................................... 15
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ELECTRONIC PROTECTION AND RELIABILITY......................................... 19
SPECIFICATIONS & FEATURES ....................................................................... 20
CARE AND MAINTENANCE............................................................................... 22
TROUBLESHOOTING.......................................................................................... 23
SERVICE .................................................................................................................. 24
WARRANTY ........................................................................................................... 25
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Summary of Contents for Halcro DM8
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Page 1: Table Of Contents
TABLE OF CONTENTS IMPORTANT SAFETY INSTRUCTIONS............. 2 INTRODUCTION ....................3 ELECTRONIC DESIGN..................4 MICROPROCESSOR CONTROL ..............5 INDUSTRIAL DESIGN..................6 MECHANICAL DESIGN ................... 7 INSTALLATION....................... 8 ......................8 NPACKING ......................8 OSITIONING FRONT PANEL CONTROLS ................. 9 REMOTE CONTROL .................... 10 DISPLAY........................ -
Page 2: Important Safety Instructions
Weighs 23 kg (50 lbs.) per unit. Shipping weight 36 kg (79 lbs) Designed for indoor use only. The dm8 preamplifier is not protected against liquids. The unit shall not be exposed to dripping or splashing. No objects filled with liquids, such as vases, shall be placed on the apparatus. -
Page 3: Introduction
We are confident that this combination of expertise, along with the know-how of the high-end audio industry’s leading Research and Development team will ensure the success of the HALCRO™ preamplifiers. The brief given to our R&D team, headed by Bruce Candy, was to produce two models of preamplifier to satisfy the needs of every audio connoisseur: Lowest distortion specifications of any preamplifier in the world. -
Page 4: Electronic Design
The volume control is implemented so as to include two identical stages in series. This minimizes output noise. The dm8 & dm10 preamplifiers feature balanced, unbalanced, current mode and bridged current mode outputs. The latter consists of a non-inverted and inverted current output. -
Page 5: Microprocessor Control
Audible relay noise The dm8 & dm10 use mechanical relays in all switching including the volume control because they exhibit the following ideal characteristics ; zero ON resistance, infinite OFF impedance, very low OFF capacitance, zero distortion. In contrast, the now universally popular solid state relays/switches exhibit none of these ideal properties and detract from performance. -
Page 6: Industrial Design
By Max Dickison & Tony Kearney Product Form The aim when designing the dm8 and dm10 was to create a preamplifier that was unmistakably part of the HALCRO™ product family, but at the same time a component that would compliment any high end audio system. -
Page 7: Mechanical Design
Please enjoy the HALCRO™ audio experience. HALCRO™ has enjoyed creating perfect audio reproduction for the world's music connoisseurs. If you wish to contact HALCRO™ to supply feedback on your purchase or for general enquiries, please feel free to contact us: Email: admin@halcro.com... -
Page 8: Installation
Positioning The HALCRO™ dm8 preamplifier can be placed anywhere indoors. There is no need to leave room around the unit to allow it to breathe. The dm8 does not generate significant amounts of heat. To ensure ultimate performance and to avoid potential safety hazards, place the unit on a firm and level surface. -
Page 9: Front Panel Controls
(CD 3. Standby/On button: The HALCRO™ player, Tuner, DVD, etc.) attached to the dm8 is designed to remain in standby unit. mode when not in use. This button will toggle the unit between Standby and On. -
Page 10: Remote Control
1. Volume buttons: For 4. Signal source buttons: volume control and also Press to select any one of 5 used in conjunction with signal sources on the dm8. the function button for various function selections. 5. Function button: Press to choose the following 2. -
Page 11: Display
Display Figure 3 Figure 4 Figure 5 1. Main Information Display 3. Signal Source Location Indicator 2. Signal Source Indicators 4. Phase Indicator 1. Main Information Display: The 2. Signal Source Indicator: Displays the information provided on this display signal source which is currently selected. changes depending on what function is currently being processed. -
Page 12: Rear Panel
If the main power switch is turned using the remote control. -
Page 13: Connections
The dm8 will control power amplifiers from balanced and unbalanced voltage sources, as well as an unbalanced current source. The dm8 will also control power amplifiers in bridged pair configuration. Custom made cables are required to run bridged power amplifiers from the balanced Voltage Output. -
Page 14: Remote Power Amplifier Control Output
The dm8 will control bridged power amplifiers. For details please email us at: service@halcro.com A bridging kit can be purchased through HALCRO™. Break-in period The dm8 does not require a break-in period. The electronic break-in period is completed at the factory. Programmable Input Selections The dm8 has seven available pairs of programmable input connectors, three unbalanced, three balanced voltage inputs and one unbalanced current input. -
Page 15: Operating Instructions
Home Theatre Processor volume control. Connecting the Mains Power Supply Cable Plug the main power cable into the dm8’s mains power socket on the rear of the unit. (Fig 6, 6). Remote Control Batteries Remove the battery cover from the rear of the unit, insert the three supplied AAA batteries into the unit (ensure that the polarity is correct). -
Page 16: Switching The Unit On
Switching the unit on Switch the main power switch to On. When the unit is switched on at the main power switch (Fig 6, 6) the pre- amplifier will go into Standby mode. Switch the unit on by pressing the Standby/On button on the unit or the remote control. To return the unit to Standby mode press the Standby/On button again. -
Page 17: Displayed Information
Displayed information In normal use the center of the display will display the volume of both the left and right of the system. When a different signal source is selected, it will appear in the center of the display for a few seconds (fig3, fig4). -
Page 18: Volume - Balancing Function
Volume – balancing function The volume can be evenly distributed though the speakers or one channel can be louder than the other. To equalise the outputs of the speakers to the same volume, depress both the L & R balance buttons (Fig1, 4&7) on the front of the unit at the same time. Front Panel: Using either the Balance Control Right (Fig 1, 5) or the Balance Control Left (Fig 1, 2), the user can change the relative volume for the left and right channels. -
Page 19: Electronic Protection And Reliability
Our components are selected not only for performance, but reliability as well. For Example: All HALCRO™ electrolytic capacitors are rated at a minimum of 105 degrees C instead of the usual 85 degrees C rating. The operational life of electrolytic capacitors is severely shortened at temperatures near their maximum temperature rating. -
Page 20: Specifications & Features
Dimensions SPECIFICATIONS & FEATURES Width: 448mm, 17.64 inches Ÿ Depth: 400mm, 15.74 inches HALCRO dm8 Ÿ Remote Control Preamplifier Height: 240mm, 9.44 inches Ÿ Weight: 22.5kg, 49.6lbs Ÿ Shipping Dimensions - In Timber case Inputs 3 RCA Unbalanced Voltage Mode §... - Page 21 Front Panel: Optical Rotary Encoder Ÿ flexibility. The program status of each input with Halcro Flux Detent is displayed on a LED adjacent with each Remote Control: 2 x Push Buttons Ÿ...
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Page 22: Care And Maintenance
After using the slightly damp cloth, wipe over the surfaces with a soft dry cloth, then allow the dm8 to air for at least one hour prior to turning the power back on. If you are unsure about cleaning the preamplifier and require more information, please ask your dealer or contact HALCRO™... -
Page 23: Troubleshooting
HALCRO™ at service@halcro.com If the dm8 does not operate as expected first switch the dm8 back to Stand-by and then switch the main power switch off. Once the display has turned off switch the main power switch back on and then switch the unit from Stand-by to On. -
Page 24: Service
Service The dm8 has been designed for maximum reliability. If a problem does occur with your unit, please contact your dealer or contact HALCRO™ at service@halcro.com Your dealer can help with trouble shooting prior to organising service for your dm8. Your dealer or the HALCRO™... -
Page 25: Warranty
The warranty will only be recognized by HALCRO™ if a copy of the original receipt from your dealer showing all details, including the date of purchase, accompanies the completed warranty registration form. - Page 26 Please describe the main function for the preamplifier. Domestic use Commercial demonstration use Please refer to the previous page for details of the warranty period for your model. Post to, HALCRO™, 118 Hayward Avenue Torrensville, South Australia, 5031. Fax to, +61 8 8238 0852...