Halcro DM8 Owner'S Manual Download Page 13

 

 

  

 Page 13 of 26 

TM

  

dm8 

 

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: 

Po, Right  channel (Red Bezel). 

Negative -, Left  channel (White Bezel). 

 

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. (Fig 7). 

 

Comments on the different dm8 Outputs 

 

The balanced voltage outputs or current-mode outputs are most desirable for minimising earth 

loop generated mains hum and ripple, or high frequency interference if they are a problem. 

Earth loop generated mains hum and ripple, or high frequency interference should not be a 

problem unless the source equipment is poorly designed. 

 

Power Amplifiers with current-mode inputs are rare and are most likely to have an RCA input 

socket. The advantages of this are: 

Ÿ 

Earth loop generated mains hum and ripple are minimized.  

Ÿ 

Cable,  plug  and  socket-generated  interference  is  minimized  (from  poor  connections 

which may be affected by sound vibration for example). 

 

The unbalanced output is quite satisfactory so long as earth loop generated mains hum and 

ripple are not a problem. 

Figure 7 

 

Summary of Contents for DM8

Page 1: ...ERIOD 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...

Page 2: ...nit shall not be exposed to dripping or splashing No objects filled with liquids such as vases shall be placed on the apparatus No naked flame sources such as lighted candles should be placed on the a...

Page 3: ...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 Physical dimensions to suit...

Page 4: ...FKP1 capacitors etc Fourth the circuits are highly immune to electromagnetic interference Some inputs and outputs include both first order filters and common mode chokes Fifth the power supply and mic...

Page 5: ...short control paths and virtually eliminates internal connectors thereby greatly increasing system reliability Each amplifier channel has its own micro controller the front panel display and user inte...

Page 6: ...to the preamp proportions have been reworked to allow this component to be either freestanding or housed within a standard 19 shelving system Control Interface Knobs and buttons The volume and input...

Page 7: ...e power supply partly due to the mechanical design of their circuit boards and the boxes that contain them Supports of folded aluminum serve not only as bases to which the electronics are anchored but...

Page 8: ...ewelry that may scratch the unit and put on the white cotton gloves provided with the unit Remove the center piece of foam in base of transit case to locate the remote control and power cable Remove t...

Page 9: ...n the left hand channel and decrease the volume on the right 3 Standby On button The HALCRO dm8 is designed to remain in standby mode when not in use This button will toggle the unit between Standby a...

Page 10: ...block or cover this sensor window Remote Control 1 Volume buttons 2 Mute button 3 Standby On button 4 Signal Source buttons 5 Function button 1 Volume buttons For volume control and also used in conj...

Page 11: ...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 2 S...

Page 12: ...16 3 Tape Monitor outputs For recording direct to tape 4 Output sockets Provide connect from the Pre Amplifier to Power Amplifier s 5 Remote sensor window Behind this window is a sensor that receives...

Page 13: ...bles are required to run bridged power amplifiers from the balanced Voltage Output Fig 7 Comments on the different dm8 Outputs The balanced voltage outputs or current mode outputs are most desirable f...

Page 14: ...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 inpu...

Page 15: ...heatre Processor Connect your Home Theatre Processor to any of the programmable inputs at the rear of the preamplifier Program the preamplifier to the unit using Allocating signal sources and the remo...

Page 16: ...bove the connectors and simultaneously point the remote control to a remote sensor window and press the button on the remote control which best describes the signal source unit you have connected The...

Page 17: ...Volume After power up and switching from Standby to ON the preamplifier will enter the mode it was last in when the power was turned off Front Panel To change the overall volume of the unit use the V...

Page 18: ...then use the Volume buttons on the remote control Depressing the VOL button will increase the volume on the left and decrease the volume on the right Depressing the VOL button will increase the volume...

Page 19: ...peratures near their maximum temperature rating This is shown in the table below All HALCRO integrated circuits are at least industrial grade rather than the usual commercial grade Industrial grade co...

Page 20: ...ages from 85VAC through to 240VAC at 50Hz through to 60Hz or 120V through to 340V D C Power supply will operate up to 270VAC but IEC sockets rated up to 240V by regulatory authorities Remote Control 3...

Page 21: ...esistors and FKP1 1250V or MKP10 capacitors in critical audio signal paths Input programming Up to 5 signal source units can be connected to the 7 physical inputs The assigned source is defined on the...

Page 22: ...ove any dust Add 15 milliliters 5 Oz of very mild household dishwashing detergent to a 4 litre 1 gal bucket of lukewarm water Immerse the soft cloth in the bucket of water then wring the cloth out tho...

Page 23: ...nation Check mains power input is connected and turned on Check fuse No audio output Ensure the input to which your source is connected and allocated to is selected Ensure the output select switch is...

Page 24: ...pt your listening pleasure due to the dm8 not having to leave your home If service is required all problems must be described in as much detail as possible This will help streamline the service proces...

Page 25: ...of purchase accompanies the completed 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...

Page 26: ...er dm8 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 acc...

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