Alesis RA150, RA300, RA500 manual

REFERENCE SERIES

POWER AMPLIFIERS

REFERENCE MANUAL

™

Contents

Main Page C IMPORTANT SAFETY INSTRUCTIONS.... 3 ABOUT THE RA150/300/500............. 7 CONNECTIONS ...................................9 OPERATION......................................21 I H OW TO U SE T HIS M I MPORTANT S AFETY I S P 4 INSTRUCTIONS DE SCURIT IMPORTANTES (FRENCH) S V BEIM BENUTZEN DIESES PRODUKTES BEACHTEN SIE BITTE DIE FOLGENDEN SICHERHEITSHINWEISE: (GERMAN) 6 CE DECLARATION OF CONFORMITY C A PRINCIPAL FEATURES THE CHASSIS I NPUTS AND O A A C C UNPACKING AND INSPECTION POWER CONSIDERATIONS THE AC CORD AND GROUNDING 10 120 V OLT /230 V OLT O F ELECTRICAL SERVICE TO THE RA150/300/500 OPERATING ENVIRONMENT T IN RACK MOUNTING O THER R ACK M OUNTING T M OUNTING ON A S NON-RACK ENCLOSURE AVOIDING ELECTROMAGNETIC I I I NPUT J ACK C 14 To use an unbalanced source with an Alesis amplifier: C C ABLE W IRING T BALANCED OR UNBALANCED? Isolation transformer or direct box To feed the same source to several different amplifiers: To use the amplifier in Bridged Mono mode: 18 O WHAT'S THE LOAD IMPEDANCE? C SPEAKER CABLES Cable length that produces 1 dB of power loss C ONNECTING S PEAKER C TO BINDING POSTS To connect speaker cable to the connectors: Using a banana plug: Using a crimp-on connector: THE IMPORTANCE OF SPEAKER P O UTPUT C BRIDGED OPERATION To connect a speaker in bridged mono mode: Should you use bridged mode? C O FRONT PANEL CONTROLS V OLUME C O N -O FF S M UTE S BACK PANEL CONTROLS AC V OLTAGE S STEREO/BRIDGED MONO SWITCH CHECKING FOR PROPER P USING THE RA150 AS A HEADPHONE AMPLIFIER C HOOSING THE C S 24 ABOUT GROUND LOOPS SYSTEM SETUP AND TESTING SETTING THE GAIN PROPERLY 26 Amplifier input clipping O UTPUT R ELAYS /T C C T TROUBLESHOOTING INDEX 28 CARE AND MAINTENANCE C REFER ALL SERVICING TO A O BTAINING R EPAIR S C AND CANADA: 30 S Reference 150 Reference 300 Page Page Architect's and Engineer's Specifications 34 I RA150/300/500 Reference Manual 35 ALESIS LIMITED WARRANTY ALESIS Los Angeles, California USA www.alesis.com PLEASE REGISTER YOUR PRODUCT ONLINE: WWW.ALESIS.COM