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dm8

TABLE OF CONTENTS

IMPORTANT SAFETY INSTRUCTIONS.............................................................2

INTRODUCTION....................................................................................................3

ELECTRONIC DESIGN.....................................................................................4

MICROPROCESSOR CONTROL.....................................................................5

INDUSTRIAL DESIGN......................................................................................6

MECHANICAL DESIGN...................................................................................7

INSTALLATION.......................................................................................................8

UNPACKING .........................................................................................................8

POSITIONING ........................................................................................................8

FRONT PANEL CONTROLS.................................................................................9

REMOTE CONTROL............................................................................................10

DISPLAY..................................................................................................................10

DISPLAY..................................................................................................................11

REAR PANEL.........................................................................................................12

CONNECTIONS.....................................................................................................13

CONNECTING TO A POWER AMPLIFIER...............................................................13

REMOTE POWER AMPLIFIER CONTROL OUTPUT................................................14

BRIDGING...........................................................................................................14

BREAK-IN PERIOD ..............................................................................................14

PROGRAMMABLE INPUT SELECTIONS................................................................14

OPERATING INSTRUCTIONS...........................................................................15

CONNECTING SIGNAL SOURCES .........................................................................15

HOME THEATRE PROCESSOR CONTROLLING VOLUME ......................................15

CONNECTING THE MAINS POWER SUPPLY CABLE ............................................15

REMOTE CONTROL BATTERIES..........................................................................15

SWITCHING THE UNIT ON ...................................................................................16

ALLOCATING SIGNAL SOURCES AND THE REMOTE CONTROL............................16

DE-ALLOCATING PROGRAM BUTTONS ..............................................................16

DISPLAYED INFORMATION.................................................................................17

DISPLAY CONTRAST ..........................................................................................17

BACK LIGHT.......................................................................................................17

VOLUME.............................................................................................................17

VOLUME – BALANCING FUNCTION....................................................................18

SWITCHING BETWEEN SOURCES.........................................................................18

PHASE CONTROL................................................................................................19

ELECTRONIC PROTECTION AND RELIABILITY.........................................19

SPECIFICATIONS & FEATURES.......................................................................20

CARE AND MAINTENANCE...............................................................................22

TROUBLESHOOTING..........................................................................................23

SERVICE..................................................................................................................24

WARRANTY...........................................................................................................25

Summary of content (26 pages)

PAGE 1
dm8 TM TABLE OF CONTENTS IMPORTANT SAFETY INSTRUCTIONS............................................................. 2 INTRODUCTION .................................................................................................... 3 ELECTRONIC DESIGN..................................................................................... 4 MICROPROCESSOR CONTROL ..................................................................... 5 INDUSTRIAL DESIGN...........................................................
PAGE 2
dm8 TM Important Safety Instructions This product shall be connected to a MAINS socket outlet with a protective earthing connection. Only suitable approved MAINS cords, as per European individual country requirements in the CE Low Voltage Directive Scheme, shall be used with this unit. Do not use extension cords: To avoid safety hazards, use only the power cord supplied with your unit. We do not recommend that extension cords be used with this unit. Weighs 23 kg (50 lbs.) per unit.
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dm8 TM Introduction Congratulations on purchasing the HALCRO™ dm8 preamplifier. It has taken two years and the generous contributions of leading reviewers, distributors and dealers from around the world to design, then create, the HALCRO™ preamplifiers. 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.
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dm8 TM ELECTRONIC DESIGN By Bruce Candy In keeping with my philosophy of design, my basic aim was to produce a preamplifier with which I, personally, am quite satisfied. I sincerely hope that others will share my satisfaction with these products. As I saw it, the major issues were: Ÿ Zero compromise on Transparency. Ÿ Flexibility. Ÿ Ease of use. Ÿ Progressive design concepts.
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dm8 TM 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.
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dm8 TM 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.
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dm8 TM Remote control: When designing the HALCRO™ Remote Control, we aimed to reflect the quality and forms of the HALCRO™ preamplifiers. Machined from a solid aluminum extrusion, the remote rests comfortably in the hand with its minimalist array of buttons falling within the natural sweep of the thumb. Simple and logical to operate, every effort has been made to keep this product free of unnecessary complexity.
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dm8 TM Installation Ensure you have read the Important Safety Instructions section on page 2 prior to installing your HALCRO™ preamplifier. If you require assistance in the unpacking and installation of your HALCRO™ preamplifier, please contact your dealer. Unpacking Undo the 4 fasteners at the base of each box. Then remove the upper part of the container by lifting directly upwards, being careful not to rub it against the preamplifier.
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dm8 TM Front Panel Controls Figure 1 1. LCD Information Display 2. Balance Control Left 3. Standby/On button 4. 5. 6. 7. Mute button Balance Control Right Input Select Control Volume Control 1. LCD Information Display: This display delivers messages and system status to assist you in operating the unit. See page 11 for a complete breakdown on the display. 2.
PAGE 10
dm8 TM 7. Volume control: Turn this knob clockwise to increase the volume and counter-clockwise to decrease the volume. To mute the system, when the speakers are balanced, continue to turn the knob counter-clockwise until the word MUTE appears on the display, or press the Mute button (Fig 1, 4) 8 Phase Button: Depressing this button will toggle the unit between in-phase and out-of-phase mode. 9 Remote sensor window: Behind this window is a sensor that receives infrared signals from the remote control.
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dm8 TM Display Figure 3 Figure 4 Figure 5 1. Main Information Display 2. Signal Source Indicators 1. Main Information Display: The information provided on this display changes depending on what function is currently being processed. In normal use it will display the volume of both the left and right of the system (Fig 4). When a different input signal source is selected it will appear on the main display (Fig 5) for a few seconds. 3. Signal Source Location Indicator 4. Phase Indicator 2.
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dm8 TM Rear Panel Figure 6 1. 2. 3. 4. Programmable inputs Program buttons Tape Monitor outputs Output sockets 5. Remote sensor window 6. Mains power switch, socket and fuse holder 1. Programmable inputs: Provides connection to your signal sources. It does not matter which input each source is connected to, as these inputs are allocated using the remote control. 2. Program buttons: Allows the inputs to be programmed to the remote control.
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dm8 TM Connections Connecting to a power amplifier Each dm8 has: 2 pairs of unbalanced current outputs. 1 pair is used in un-bridged mode and both are used for driving bridged amplifiers, 2 pairs of unbalanced voltage outputs and 2 pairs of balanced voltage outputs. Select the method you wish to operate your power amplifiers in, and connect the 2 units using high quality cables. Outputs are color coded: Positive +, Right channel (Red Bezel). Negative -, Left channel (White Bezel).
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dm8 TM Remote Power Amplifier control Output The dm10 has a remote power amplifier control output (fig 6,15) which will remotely switch the HALCRO™ amplifiers from Standby to On. Cables can be purchased through HALCRO™ for details please email us at: service@halcro.com . Bridging 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.
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dm8 TM Operating Instructions Connecting signal sources As a safety precaution please ensure that the unit is not connected to the mains power while connecting signal sources. When you originally receive your preamplifier all the inputs are de-allocated. If you are changing your signal source units, de-allocate the input source first – follow Deallocating Program Buttons instructions (Page 16) Connect all signal source units (e.g.
PAGE 16
dm8 TM 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. Note: To continue the set up process, the unit must be On, not in Standby.
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dm8 TM 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). Display Contrast To adjust the display contrast, press and hold any of the Program Buttons on the rear panel (fig 6, 8) and turn the Volume control on the front panel until the desired contrast is achieved.
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dm8 TM 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.
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dm8 TM Phase Control To toggle the unit between in-phase and out-of-phase mode depress the phase switch on the front panel (Fig 1,10) or depress the function key (Fig 7, 5) on the remote control twice, the display (Fig 3) will display In or Out, now press either of the volume buttons on the remote control to toggle the unit between in-phase and out-of-phase mode. Electronic Protection and Reliability Components Our components are selected not only for performance, but reliability as well.
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dm8 SPECIFICATIONS & FEATURES HALCRO dm8 Remote Control Preamplifier Inputs § 3 RCA Unbalanced Voltage Mode § 3 XLR Balanced Voltage Mode § 1 RCA Unbalanced Current Mode § Any 5 of the above I/Ps are user programmable to respond to the device names: CD, DVD, Tuner, Tape, Aux.
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dm8 SPECIFICATIONS & FEATURES HALCRO dm8 Remote Control Preamplifier Display: Backlit LCD (Back light can be turned off – see page 16) Displays L&R volume setting, selected input and phase. Controls On/Standby: Ÿ Front Panel: 1 x Push Button Ÿ Remote Control: 1 x Push Button Volume: Ÿ Front Panel: Optical Rotary Encoder with Halcro Flux Detent Ÿ Remote Control: 2 x Push Buttons Input Select.
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dm8 TM Care and Maintenance The HALCRO™ dm8 preamplifier has been designed for indoor use only. Under no circumstances should the preamplifier be allowed to get wet. The only maintenance required is to keep the unit clean. Important. HALCRO™ takes no responsibility for any damage caused through careless or improper cleaning techniques. Never use flammable or corrosive products when cleaning the dm8. Please read the following procedures very carefully.
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dm8 TM Troubleshooting The dm8 contains no user serviceable parts inside the compartments. Do not attempt to open the unit as this will void the warranty and will expose you to dangerous voltages. For all service requirements please contact your dealer or email 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.
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dm8 TM 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™ service department will always try to help you correct any basic problems at your home via email or telephone.
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dm8 TM Warranty IMPORTANT - Please read the following details very carefully HALCRO™ products are warranted to be free of defects if used under normal conditions for a period of ninety (90) days from the date of purchase. To extend the warranty period to four (4) years for the dm8, please complete and return the warranty registration form. As mentioned previously, do not attempt to open any of the preamplifier compartments. The compartments are sealed at the factory.
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dm8 TM Warranty Registration Form One form must be completed for every preamplifier. Title…………… First name………………………….. Surname………………………. Address………………………………………………….………………………………… …………………………………………………………………….………………………….. Zip or post code………………………Country………………………………………. Date of Birth: Day………..Month………….Year………….. Phone numbers: Home (……)…………………….. Work (……)…….…………….. Facsimile numbers: Home (……)………………… Work (……)…….………………. Email address……………………………………………… PRODUCT DETAIL Model number dm8 Serial number ……….…….