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RA150/300/500 Reference Manual 1
CONTENTS
Introduction......................................................2
How to Use This Manual...........................2
IMPORTANT SAFETY INSTRUCTIONS.... 3
Instructions de Sécurité 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
I
NDEX.............................................34
A
LESIS LIMITED WARRANTY ............ 35