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Monoblock Power Amplifier

Owner’s Manual

www.halcro.com

dm88

dm78

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Summary of Contents for DM78

Page 1: ...Monoblock Power Amplifier Owner s Manual www halcro com dm88 dm78...

Page 2: ...Break in period 11 dm78 Inputs 12 dm88 Inputs 13 Operation 14 Electronic Protection and Reliability 15 Components 15 Output Current Limiting 16 Output transistor protection 17 Unusual output condition...

Page 3: ...ectronic design was to create an amplifier that did not color the sound with its own electronic characteristics to recreate the original sound as it was at the time of recording Please enjoy the Halcr...

Page 4: ...gle is intended to alert the user to the presence of important operating and maintenance servicing instructions in the following pages The CE symbol indicates compliance of this device with the releva...

Page 5: ...outlet The unit should be installed in a position where the mains plug is easily accessible Disconnect the unit from the mains if it is to be left unused for a long period WARNING No naked flame sourc...

Page 6: ...h the same type and rating as specified F 10 A L 250 V DANGER Always disconnect the unit from the mains before touching the loudspeaker terminals or replacing the fuse Protection from overheating The...

Page 7: ...ways bend at the knees when lifting Do not strain your back Wiring to the loudspeaker terminals to Class 2 wiring US wiring regulations This equipment has been classified as having a Class 2 loudspeak...

Page 8: ...two blades with one wider than the other A grounding type plug has two blades and a third grounding prong The wide blade or the third prong is provided for your safety If the provided plug does not f...

Page 9: ...owever there is no guarantee that interference will not occur in a particular installation If this equipment does cause harmful interference to radio or television reception which can be determined by...

Page 10: ...sed of in general household waste but recycled in compliance with local government regulations or environmental requirements o Please dispose of this equipment via a recycling service or centre or by...

Page 11: ...l it clears the top of the amplifier o With an assistant remove the plastic wrapping and foam pieces then lift the amplifier from the base of the container o Remove the plastic covering from the unit...

Page 12: ...8 are equipped with a separate ground terminal which may be used to reduce hum and ripple in some circumstances There may be high vol ages present at the loudspeaker terminals which may present an ele...

Page 13: ...likely to have an RCA output socket The advantages of this source are that Earth loop generated mains hum and ripple are minimized and cable plug and socket generated interference is minimized from po...

Page 14: ...e minimized and 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...

Page 15: ...mode In this mode a small current is drawn from the mains supply but the unit will not drive the loudspeakers o Press the mode switch once to switch between Standby and ON modes The mode switch is a s...

Page 16: ...at least industrial grade rather than the usual commercial grade Industrial grade components are rated at least from 40 C to 85 C whereas commercial grade components are only rated from 0 to 70 C In...

Page 17: ...ns the first and third amplifier types above highly obvious cracking overload sounds may be heard Note that this overload sound may also occur if a loudspeaker overloads or if any amplifier suffers vo...

Page 18: ...e must wonder where the heat generated is dissipated if this load is predominantly resistive or why the coupling is so poor if this load is predominantly reactive Hence we believe that these excessive...

Page 19: ...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 maste...

Page 20: ...ohm input impedance to minimize cable reflections to be fed from an infinite impedance current source The voltage gain of the balanced and unbalanced inputs is 60 V V The gain of the current mode is 9...

Page 21: ...in the power amplifier to minimize stray magnetic fields and to accurately define voltages four layer PCBs are used in the power supply to minimize E M I and voltage transients which improves reliabil...

Page 22: ...edance to minimize cable reflections to be fed from an infinite impedance current source a minimal path voltage mode with an input impedance of 660 ohms The voltage gain of the balanced and unbalanced...

Page 23: ...emperatures is protected against most mains transients Components Footnote 4 For reliability all semiconductors are at least industrial grade in both the power supply and amplifier All electrolytics a...

Page 24: ...ight 120 lb or 55 kg Height 31 in or 79 cm Width 16 in or 40 cm Depth 16 in or 40 cm Shipping weight one pair including pallet 385 lb or 175 kg Footnotes 1 THD specifications of our typical best compe...

Page 25: ...rly from the heat sink area o Add 15 ml 0 5 oz of very mild household dishwashing detergent to a four liter one gallon bucket of tepid water o Immerse the soft cloth in the bucket of water and then wr...

Page 26: ...e Master Switch is ON Check fuse Red light is on no sound Press the Standby ON switch to ON Green light is on No sound Ensure Input Selector switch is set to the correct input Ensure loudspeaker cable...

Page 27: ...Halcro products Product warranty Halcro warrants the dm78 monoblock amplifier to be free from defects in materials and workmanship for a period of five years from the original date of purchase Halcro...

Page 28: ...ct Warranty Registration form provided or request a copy from your Halcro dealer If service is required We suggest that you work with your authorized Halcro dealer when the need for technical service...

Page 29: ...horization number a detailed description of the situation and signature of authorized Halcro representative Freight damage claims If a unit being returned to Halcro is damaged in shipment Halcro will...

Page 30: ...Copyright and acknowledgements This product is manufactured by Extraordinary Technology Hi Fi Pty Ltd trading as Halcro and Halcro Audio USA Inc Halcro dm78 dm88 Owner s Manual Revision 1 2 Halcro 20...

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