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Фрагмент инструкции
All rights reserved. Reproduction in whole or in part is prohibited. “RA150/300/500” and “Reference Series” are trademarks of Alesis Studio Electronics, Inc. ALESIS CONTACT INFORMATION Alesis Studio Electronics, Inc. 1633 26th Street Santa Monica, CA 90404 USA Do not use this address for repair service. Telephone: 800-5-ALESIS (800-525-3747) E-Mail: support@alesis.com Website: CONTENTS Introduction......................................................2 How to Use This Manual...........................2 IMPORTANT SAFETY INSTRUCTIONS.... 3 Instructions de Securite Importantes (French)......4 Beim Benutzen dieses Produktes beachten Sie bitte die folgenden Sicherheitshinweise: (German) ..........................................................5 CE Declaration of Conformity.............................6 ABOUT THE RA150/300/500............. 7 Principal Features..............................................7 The Chassis..............................................7 Inputs and Outputs...................................7 Amplifier topology...................................7 Protection Circuitry ..................................7 About this manual.............................................8 CONNECTIONS ...................................9 Unpacking and Inspection..................................9 Power Considerations........................................9 The AC Cord and Grounding....................9 120 Volt/230 Volt Operation.................... 10 Fuse....................................................... 10 Electrical Service to the RA150/300/500... 10 Operating Environment ................................... 11 Temperature Considerations in Rack Mounting............................................... 11 Other Rack Mounting Tips ...................... 11 Mounting on a Shelf or in a Non-Rack Enclosure............................................... 12 Avoiding Electromagnetic Interference .... 12 Inputs............................................................. 13 Input Jack Characteristics........................ 13 Cables.................................................... 15 Cable Wiring Tips................................... 15 Balanced or Unbalanced? ........................ 16 Outputs .......................................................... 18 What's the Load Impedance?................... 18 Connectors..............................................18 Speaker Cables........................................18 Connecting Speaker Cables to Binding Posts.......................................................19 The Importance of Speaker Polarity..........20 Output Connections for Bridged Operation ...............................................20 OPERATION......................................21 Front Panel Controls.........................................21 Volume Controls.....................................21 On-Off Switch.........................................21 Mute Switch............................................21 Protect/Clip Indicators............................22 Meters (RA300 and RA500 only)...............22 Back Panel Controls..........................................22 AC Voltage Switch ..................................22 Stereo/Bridged Mono Switch...................22 Checking For Proper Polarity............................22 Using the RA150 as a Headphone Amplifier.......23 Choosing the Correct Speakers..........................23 About Ground Loops........................................24 System Setup and Testing .................................25 Setting the Gain Properly.........................25 Output Relays/Thermal Cycling ..............26 TROUBLESHOOTING.......................... 27 Troubleshooting Index......................................27 Care and Maintenance......................................28 Cleaning.................................................28 Refer All Servicing to Alesis.....................28 Obtaining Repair Service .........................29 Customers outside the USA and Canada: ..................................................29 SPECIFICATIONS...............................30 INDEX.............................................34 ALESIS LIMITED WARRANTY ............ 35 RA150/300/500 Reference Manual Introduction/Safety Instructions INTRODUCTION Thank you for purchasing this Alesis RA150, RA300, or RA500™ Reference Series power amplifier. To take full advantage of this amplifier’s functions, and to enjoy long and trouble-free use, please read this user’s manual carefully. HOW TO USE THIS MANUAL This manual is divided into the following sections describing the various functions and applications for the RA series amplifier. Though we recommend you take time to read through the entire manual once carefully, those having general knowledge about amplifiers should use the table of contents to look up specific functions. Chapter 1: Introduction. If you want to start using the RA150/300/500 right away, here’s a one-page guide to hooki...
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