Halcro DM38 Owner'S Manual Download Page 1

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dm38

Table of Contents

Important Safety Instructions .................................................................... 2

Introduction..................................................................................................... 3

Installation....................................................................................................... 4

Unpacking................................................................................................. 4

Positioning ................................................................................................ 5

Connections..................................................................................................... 5

Connecting the Mains Supply Cable................................................... 5

Connecting the Loudspeakers .............................................................. 5

Connecting the External Ground......................................................... 6

Bridging..................................................................................................... 6

Running-in period................................................................................... 6

dm38 Input Selections ............................................................................ 6

Comments on the different dm38 inputs ........................................... 7

Operating Instructions ................................................................................. 8

Electronic Protection and Reliability........................................................ 9

Specifications for the dm38.......................................................................13

Care and Maintenance................................................................................14

Troubleshooting...........................................................................................15

Service.............................................................................................................16

Warranty.........................................................................................................17

Warranty Registration Form .....................................................................18

Summary of Contents for DM38

Page 1: ...ply Cable 5 Connecting the Loudspeakers 5 Connecting the External Ground 6 Bridging 6 Running in period 6 dm38 Input Selections 6 Comments on the different dm38 inputs 7 Operating Instructions 8 Electronic Protection and Reliability 9 Specifications for the dm38 13 Care and Maintenance 14 Troubleshooting 15 Service 16 Warranty 17 Warranty Registration Form 18 ...

Page 2: ... 65Hz The Amplifier s Positive Loudspeaker Terminal can generate Hazardous Live Voltages To comply with International Safety Standards only use Loudspeaker cables with well insulated terminals such as WBT 0660 Always switch the amplifiers to Stand By or OFF before touching these terminals or adjusting loudspeaker connections Never obstruct the airflow to the heatsinks Contains no user serviceable ...

Page 3: ... the electronic design was to create an amplifier which did not color the sound with its own electronic characteristics i e recreate the original sound as it was at the time of recording Please enjoy the HALCRO audio experience HALCRO has enjoyed creating perfect audio reproduction for the world s music connoisseurs If you desire to contact HALCRO to give us feedback on your purchase or for genera...

Page 4: ...rew the 4 knurled knobs at the base of each box Then remove the upper part of the container by lifting directly upwards till it clears the top of the amplifier 2 With an assistant remove the plastic wrapping and foam pieces then lift the amplifier from the base of the container Remove the plastic covering from the unit Please save it for later use 3 Move the unit to its final location see Position...

Page 5: ...itive Red Bezel 2 x Negative Black Bezel All of the pure copper connections are finished with the highest grade gold plating Ensure the positive terminal of the amplifier connects to the positive terminal of the loudspeaker This will ensure correct phasing of the audio signal The loudspeaker terminals will accept spade or hook terminals Only fully insulated terminal are to be used Ensure the louds...

Page 6: ...od The dm38 s electronic running in period is completed at the factory A further running in period is not required dm38 Input Selections The dm38 has three switch selectable inputs each having a separate input socket Both the input sockets and switch are mounted on the top rear panel Input Styles Required output source impedance Input socket Input impedance Balanced voltage input Low impedance e g...

Page 7: ...ut socket The advantages of this source are that Earth loop generated mains hum and ripple are minimized Cable plug and socket generated interference is minimized from poor connections which may be affected by sound vibration for example The unbalanced input is quite satisfactory so long as earth loop generated mains hum and ripple is not a problem All or some of the input sockets may have active ...

Page 8: ...current is drawn from the mains supply but the unit will not drive the loudspeakers Press the mode switch once to switch between Standby and ON modes The mode switch is a small pressure switch accessed when standing at the front of the unit It is located under the bottom lip of the top compartment When the amplifier has been switched to ON the LEDs on the front and rear will glow green The amplifi...

Page 9: ...grade rather than the usual commercial grade Industrial grade components are rated at least from 40 degrees C to 85 degrees C whereas commercial grade components are only rated from 0 to 70 degrees C In addition the electronic specifications of industrial grade components are superior to commercial grade Electrolytic capacitor temperature rating Mean lifetime at 40 degrees Centigrade Mean lifetime...

Page 10: ...lso occur if a loudspeaker overloads or if any amplifier suffers voltage overload There is an expectation in the audiophile electronic industry that a high end amplifier should be capable of delivering exactly double the output current for a halving of the loudspeaker impedance down to 1 ohm at the maximum output voltage that the amplifier can produce This requires an amplifier of type b or c abov...

Page 11: ...ominantly reactive Hence we believe that these excessively high output currents are not required for well designed loudspeakers and highly dangerous Many people have listened to maximum available current limited amplifiers played through different loudspeakers without encountering any current limiting problems that is obvious cracking sounds at very loud listening levels except for loudspeaker or ...

Page 12: ...ly limit will only cut in under fault conditions Internal power supply protection There are numerous power supply protection circuits for example Two independent over temperature cut outs Two independent master clock fault sensing circuits All power supplies including those for housekeeping standby active power factor correction and switch mode power etc check for under over voltage and over curre...

Page 13: ... or 55 kg Shipping weight 187 lbs or 85 kg PROTECTION THE AMPLIFIER PROTECTION Is short circuit proof Has over current limiting Will cut out if temperature is excessive Will cut out if a continuous D C offset appears on output Will cut out if output current exceeds 10A average continuously over a period of a few minutes Is protected against most input overloads THE POWER SUPPLY PROTECTION Will cut...

Page 14: ...tsink area Add 15 mls 0 5 oz of very mild household dishwashing detergent to a 4 litre 1 gal bucket of luke warm water Immerse the soft cloth in the bucket of water then wring the cloth out thoroughly until the cloth is nearly dry The slightly damp cloth should only ever be used to clean the anodized aluminum surfaces and timber feet Never clean any electrical fittings terminals or the front and r...

Page 15: ...re the Master Switch is ON 4 Check Fuse Red light is on No sound 1 Press the Standby ON switch to ON Green light is on No sound 1 Ensure Input Selector Switch is set to the correct input 2 Ensure Loudspeaker Cables are correctly connected both ends 3 Ensure the Input cables are correctly connected both ends 4 Check preamplifier is on and correctly connected 5 Check for a signal from the preamplifi...

Page 16: ...service is required all problems must be described in as much detail as possible This will help streamline the service process Return authorization from HALCRO prior to shipment must be obtained for any service requirements To obtain this authorization please ask your dealer or email us at service halcro com The original packaging is required for shipping purposes HALCRO will not be responsible fo...

Page 17: ...ted warranty registration form The warranty period will commence at the date of purchase not at the date the warranty registration form is received by HALCRO Return authorization from HALCRO prior to shipment must be obtained for any warranty requirements To obtain this authorization please email HALCRO at service halcro com or fax 61 8 8238 0852 The original packaging must be used for shipping th...

Page 18: ...m38 Serial number located on a badge at the bottom of rear panel Date of purchase Day Month Year Purchased from Dealer name You must attach a copy of the original receipt for the warranty to be accepted Please describe the main function for the amplifier Domestic use Commercial use Demonstration use Please refer to the previous page for details of the warranty period for your model Post to HALCRO ...

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