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Table of Contents
Related Manuals for Halcro DM88
Summary of Contents for Halcro DM88
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Page 2: Table Of Contents
Connecting the loudspeakers ....11 Freight damage claims......28 Connecting the external ground ....11 If you have moved ........28 Connecting the mains supply cable..11 Thank you for choosing Halcro!....28 Break-in period..........11 dm78 Inputs ..........12 dm88 Inputs..........13 Operation ..........14 Electronic Protection and Reliability .. -
Page 3: Introduction
Halcro designs and manufactures the only "Super Fidelity" amplifiers in the world. This If you desire to contact Halcro to give us "Super Fidelity" amplifier reproduces with feedback on your purchase or for general better than 99.9997% purity of all tones enquiries;... -
Page 4: Important Safety Information
Important Safety Information Symbols ‘CE’ symbol indicates The following symbols are used on this compliance of this device with equipment: the relevant directives of the lightning flash with European community including arrowhead symbol, within an (Electromagnetic equilateral triangle, is intended to Compatibility) (Low alert the user to the presence of... -
Page 5: Electrical Safety
Protection from fluids modify or repair the dm78/88. Opening The Halcro Logic dm78/88 units are designed dm78/88 for indoor use only and are not protected expose against liquids. They must not be exposed to dangerous... -
Page 6: Service Warnings
Cleaning may be performed with a slightly damp cloth that has been wrung until nearly DANGER: Always disconnect dry. Refer to the section on Cleaning the unit from the mains before page 24. touching loudspeaker WARNING: To reduce the risk terminals or replacing the fuse. -
Page 7: Lifting Or Moving
Lifting or moving Wiring to the loudspeaker terminals to Class 2 wiring WARNING: Weighs 55 kg (120 lb) per unit. Shipping weight is 85 kg (US wiring regulations) (187 lb). Never lift the ampl ier by yourself. This equipment has been classified as having a Class 2 loudspeaker output requiring wiring 120lb Always... -
Page 8: Additional Important Safety Instructions For Us
Additional Important Safety Instructions for US o Protect the power cord from being The following instructions should be followed by customers in the USA in addition to the walked on or pinched particularly at safety instructions in the rest of this chapter: plugs, convenience receptacles, and the point where they exit from the apparatus. -
Page 9: Interference Warning - Us Fcc Regulations
This equipment has been tested and found to Changes modifications expressly comply with the limits for a Class B digital approved by Halcro could void the user's authority operate equipment. device, pursuant to part 15 of the FCC Rules. These... -
Page 10: For Consumers Within The European Union
Please dispose of this equipment via a recycling service centre, returning unit local Minelab/Halcro distributor. This will enable the equipment to be disposed of in an environmentally safe manner. o Disposal of unwanted waste electronic equipment landfilled waste... -
Page 11: Installation
Do not lift the unit under the top Positioning compartment. We suggest that the Halcro amplifiers be positioned as near to your loudspeakers as practical. This will reduce the length of the Unpacking loudspeaker cable required. The sides of the... -
Page 12: Controls And Connections
Connecting the loudspeakers Connecting the external ground The dm78 and dm88 have four loudspeaker terminals each: The dm78 and dm88 are equipped with a • separate ground terminal, which may be used 2 x positive + (red bezel) reduce ripple some •... -
Page 13: Dm78 Inputs
dm78 Inputs The dm78 has three switch selectable inputs, Sources with current-mode outputs are rare each having an associated input socket. Both and are most likely to have an RCA output the input sockets and switch are mounted on socket. The advantages of this source are the top rear panel, and the switch must be that: operator set to indicate which input is... -
Page 14: Dm88 Inputs
Inputs The dm88 has four switch selectable inputs, Earth loop generated mains hum and ripple each having an associated input socket. The are minimized, and cable, plug and socket input sockets and switch are mounted on the generated interference is minimized (from... -
Page 15: Operation
It is safer to turn the mains power off when not The master ON/OFF switch is on the using dm78 dm88 monoblock base of the lower compartment, near the amplifiers for extended periods. However the mains socket on the unit. You will have to... -
Page 16: Electronic Protection And Reliability
“industrial grade” rather than the usual many high-end audio amplifier designers. “commercial grade” Halcro has paid a great deal of attention to this Industrial grade components are rated at area. least from –40ºC to +85ºC whereas commercial grade components are only rated from 0 to 70ºC. -
Page 17: Output Current Limiting
Output Current Limiting In terms of maximum available output current, types above), highly obvious “cracking” there are basically three amplifier type options: overload sounds may be heard. Note that this overload sound also occur • an amplifier with a reasonable limit placed loudspeaker overloads or if any amplifier on the maximum available output current suffers voltage overload. -
Page 18: Output Transistor Protection
4 ohms (not 1 or 2 ohms) • all valve amplifiers are output current Output transistor protection limited, and yet the industry does not consider this a problem, which is Halcro uniquely incorporates circuitry that inconsistent with the belief that maximum accurately calculates mean power... -
Page 19: Unusual Output Conditions
The vast majority of amplifier faults show up as factor correction and switch mode power high positive or negative DC output voltages. etc check for under/over voltage and An independent circuit in the Halcro amplifiers over current conditions senses any unreasonable DC. output voltage •... -
Page 20: Dm78 Specifications
dm78 Specifications Power Noise Power output into 4 ohms resistive > 400 W. The equivalent input noise at the input is 5 nV/sqrt(Hz) for the voltage modes and Power output into 8 ohms resistive > 225 W. 6 pA/sqrt(Hz) for the current mode. Distortion (Footnote 1) Slew rate limit... - Page 21 Protection Compartments The amplifier protection: There are four heavily shielded compartments: • • is short-circuit proof a power supply unit • • has over current limiting an input amplifier section • • Has gradual power limiting if amplifier a power amplifier compartment becomes too hot •...
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Page 22: Dm88 Specifications
Specifications Power Power output into 4 ohms resistive > 500 W. voltage gain balanced Power output into 8 ohms resistive > 270 W. unbalanced inputs is 60 V/V and 30 V/V for the minimal path mode. The gain of the... - Page 23 Overload Components (Footnote 3) (Footnote 4) Recovery from hard overload at 20 kHz into For reliability, all semiconductors are at least 4 ohms is 1 µs. industrial grade in both the power supply and amplifier. All electrolytics are rated to 105°C in both the amplifier and power supply.
- Page 24 Filtering Footnotes Series and common mode EMI filtering is THD specifications of our typical best present: competitors are, 200,000 parts per billion. • Unique to the best of our knowledge. on the mains input • between the amplifier and power supply Indicates excessive negative...
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Page 25: Care And Maintenance
Care and Maintenance o Use the slightly damp cloth only The dm78 and dm88 monoblock amplifiers to clean have been designed for indoor use only. the anodized aluminum surfaces and Under no circumstances should the amplifier timber feet. be allowed to get wet. The only maintenance Never clean any electrical fittings, required is to ensure the unit is kept clean. -
Page 26: Troubleshooting
Troubleshooting The Halcro dm78 and dm88 contain no user For all service requirements please contact serviceable parts. Please do not attempt to your dealer, or Halcro at service@halcro.com open the unit as this will void the warranty and will expose you to dangerous voltages. -
Page 27: Service And Warranty Information
During the warranty period, Halcro will remedy in Halcro products for years to come. It is our all such defects without charge for parts or expressed desire that your Halcro products labor. -
Page 28: Transferability
To qualify for free warranty service, the that the original sales receipt or proof of following conditions must be met: purchase is supplied to both subsequent • the unit must be returned to Halcro or its owners Halcro when ownership authorized repair center in the original changes. -
Page 29: Transportation Of Products
Halcro dealer upon request. We are not equipped to accept freight collect shipments. Thank you for choosing Halcro is not liable for freight, courier, or other Halcro! charges incurred in transporting a unit to and from a dealership, service center, or the... - 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 2005...