ALESIS POWER AMPLIFIER RA500 - Manual (Page 3)

RA150/300/500 Reference Manual 1
C
ONTENTS
Introduction ...................................................... 2
How to Use This Manual........................... 2
I MPORTANT S AFETY I NSTRUCTIONS .... 3
Instructions de Sécurité Importantes (French) ...... 4
Beim Benutzen dieses Produktes beachten Sie
bitte die folgenden Sicherheitshinweise:
(German) .......................................................... 5
CE Declaration of Conformity............................. 6
A BOUT 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
C ONNECTIONS ................................... 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
O PERATION ......................................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
T ROUBLESHOOTING .......................... 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
S PECIFICATIONS ...............................30
I NDEX .............................................34
A LESIS L IMITED W ARRANTY ............ 35