Halcro DM10 Owner's Manual

Preamplifier
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dm10

TABLE OF CONTENTS

IMPORTANT SAFETY INSTRUCTIONS ................................................................2
INTRODUCTION..........................................................................................................3
INSTALLATION............................................................................................................9
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FRONT PANEL CONTROLS ....................................................................................10
REMOTE CONTROL ..................................................................................................11
DISPLAY........................................................................................................................12
REAR PANEL................................................................................................................13
CONNECTIONS ..........................................................................................................15
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OPERATING INSTRUCTIONS................................................................................17
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ELECTRONIC PROTECTION AND RELIABILITY .............................................22
SPECIFICATIONS & FEATURES OF THE HALCRO DM10 .............................23
CARE AND MAINTENANCE...................................................................................25
TROUBLESHOOTING ...............................................................................................26
SERVICE ........................................................................................................................27
WARRANTY .................................................................................................................28
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Summary of Contents for Halcro DM10

  • Page 1: Table Of Contents

    ................21 OLUME BALANCING FUNCTION ....................21 TEREO FUNCTION ......................21 HASE ONTROL ..................22 WITCHING BETWEEN SOURCES ELECTRONIC PROTECTION AND RELIABILITY ..........22 SPECIFICATIONS & FEATURES OF THE HALCRO DM10 ......23 CARE AND MAINTENANCE...................25 TROUBLESHOOTING ....................26 SERVICE ........................27 WARRANTY .........................28 Page 1 of 29...
  • Page 2: Important Safety Instructions

    Weighs 23 kg (50 lbs.) per unit. Shipping weight 36 kg (79 lbs) Designed for indoor use only. The dm10 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

    Innovation in design. Ÿ The HALCRO™ dm8 & dm10 preamplifiers will add no colorations to the music. When used in conjunction with HALCRO™ power amplifiers, all you will hear is the original recording reproduced the way the artist intended it to sound.
  • Page 4 In order to meet this challenge, the resulting circuits have particular characteristics: First, all circuits in the preamp have distortion so low that it is Ÿ immeasurable, whether THD, IM etc. Second, all circuits in the preamp exhibit exceptionally low noise (see Ÿ...
  • Page 5 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 6: 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, Ÿ infinite OFF impedance, Ÿ Ÿ very low OFF capacitance, Ÿ zero distortion.
  • Page 7: Industrial Design

    By Max Dickison & Tony Kearney Product Form The aim when designing the dm8 & 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 8: 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 9: Installation

    Positioning The HALCRO™ dm10 preamplifier can be placed anywhere indoors. There is no need to leave room around the unit to allow it to breathe. The dm10 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 10: Front Panel Controls

    8. Input Select Control 1. Headphone Jack: This jack may be Using this 4. Balance Control Left: used to listen to the dm10’s output button in conjunction with Balance through a pair of headphones. Ensure Control Right (Fig 1, 7), the user can that the headphones have a standard ¼”...
  • Page 11: Remote Control

    1. Volume buttons: For 4. Signal Source buttons: volume control and also used Press to select any one of 6 in conjunction with the function signal sources on the dm10. button for various function selections. 5. Function button: Press choose following 2.
  • Page 12: Display

    Display Figure 2 Figure 3 Figure 4 Figure 5 1. Main Information Display 4. Phase Indicator 2. Signal Source Indicators 5. Stereo Indicator 3. Signal Source Location Indicator 1. Main Information Display: The 2. Signal Source Indicator: Displays the information provided on this display signal source which is currently selected.
  • Page 13: Rear Panel

    4. Phono Gain Switch: Allows the user to selector: Allows the user to precisely match set the phono input x1, x2 or x4 to match the the dm10 to the capacitance and resistance output of the cartridge. of the phono cartridge.
  • Page 14 – see Connecting signal sources and left on and the dm10 left in standby when Allocating signal sources and the remote control not in use. If the main power switch is...
  • Page 15: Connections

    The dm10 will control power amplifiers from balanced and unbalanced voltage sources, as well as an unbalanced current source. The dm10 will also control power amplifiers in bridged pair configuration. Custom made cables are required to run bridged power amplifiers from the balanced Voltage Output (Fig 8).
  • Page 16: Remote Power Amplifier Control Output

    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...
  • Page 17: Operating Instructions

    (Fig 6, 5) to match your turntable. The dm10 has three gain settings for the phono input: x1, x2 and x4 (Fig 6, 4).. This allows the user to match the preamplifier to the output of the cartridge. Select appropriate gain level The dm10 can be precisely matched to the capacitance and resistance of the moving magnet cartridge by adjusting the corresponding knobs at the rear of the unit (Fig 6, 1&2).
  • Page 18: Connecting The Mains Power Supply Cable

    Connecting the Mains Power Supply Cable Plug the main power cable into the dm10’s main power socket on the rear of the unit. (Fig 6, 13). 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 19: De-Allocating Program Buttons

    De-allocating Program buttons Note: Ensure the location being de-allocated is not the currently selected input, the currently selected input can not be de-allocated. Press and hold the applicable program button and simultaneously point the remote control to a remote sensor window and press the Mute button. The Program Button will flash twice and then remain off.
  • Page 20: Volume

    Stored Volumes The dm10 memorises two volume levels. These setting are for the Headphone output and the Power Amplifier output. A volume setting for each programmed input source is memorised on either power off or on selection of a different input.
  • Page 21: 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.
  • Page 22: 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 degree C rating. The operational life of electrolytic capacitors is severely shortened at temperatures near their maximum temperature rating.
  • Page 23: Specifications & Features Of The Halcro Dm10

    Dimensions SPECIFICATIONS & FEATURES of the Width: 448mm, 17.64 inches Ÿ HALCRO dm10 Depth: 400mm, 15.74 inches Ÿ Remote Control Preamplifier Height: 240mm, 9.44 inches Ÿ Weight: 23kg, 49.6lbs Ÿ Inputs Shipping Dimensions 3 RCA Unbalanced Voltage Mode §...
  • Page 24 Noise SPECIFICATIONS & FEATURES of < 0.6nV/sqrt (Hz) equivalent input noise for the HALCRO dm10 moving coil Remote Control Preamplifier < 6nV/sqrt (Hz) equivalent input noise for moving coil at 1kHz (< 1H and < 600ohm Controls coils) On/Standby: <...
  • Page 25: Care And Maintenance

    Care and Maintenance The HALCRO™ preamplifier has been designed for indoor use only. Under no circumstances should the unit 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.
  • Page 26: Troubleshooting

    HALCRO™ at service@halcro.com If the dm10 does not operate as expected first switch the dm10 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 27: Service

    Service The dm10 has been designed for maximum reliability. If a problem does occur with your unit, please contact your dealer. Your dealer can help with trouble shooting prior to organizing service for your dm10. Your dealer or the HALCRO™ service department will always try to help you correct any basic problems at your home via email or telephone.
  • Page 28: Warranty

    The warranty registration form is included on the following page. Please cut it out carefully along the line up the left-hand side of the page and return it to HALCRO™. You will find the address and facsimile details on the warranty registration form.
  • Page 29 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………………………………………………...

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