Alesis RA150, RA300, RA500 manual Contents

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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

INDEX

34

ALESIS LIMITED WARRANTY

35

RA150/300/500 Reference Manual

1

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Contents Reference Series Power AmplifiersAlesis Contact Information Contents Introduction HOW to USE this ManualSafety Symbols Used in this Product Important Safety InstructionsInstructions DE Sécurité Importantes French Symboles Utilisés Dans CE ProduitLesen Sie die Hinweise EMC CE Declaration of ConformityPrincipal Features About this Manual Reference Series FeaturesPower Considerations ConnectionsAC Cord and Grounding Electrical Service to VOLT/230 Volt OperationFuse Temperature Considerations in Rack Mounting Operating EnvironmentOther Rack Mounting Tips Avoiding Electromagnetic Interference Mounting on a Shelf or in a NON-RACK EnclosureInputs Input Jack CharacteristicsTo use an unbalanced source with an Alesis amplifier Balanced wiring of an XLR input ConnectorCables Cable Wiring TipsBalanced or UNBALANCED? To connect a balanced line output to feed the RA150/300/500To connect an unbalanced source to the amplifier input To feed the same source to several different amplifiers To use the amplifier in Bridged Mono modeSpeaker Cables ConnectorsOutputs Whats the Load IMPEDANCE?To connect speaker cable to the connectors Connecting Speaker Cables to Binding PostsShould you use bridged mode? To connect a speaker in bridged mono modeImportance of Speaker Polarity Output Connections for Bridged OperationOperation ON-OFF SwitchVolume Controls Mute SwitchMeters RA300 and RA500 Back Panel ControlsChecking for Proper Polarity Choosing the Correct Speakers Using the RA150 AS a Headphone AmplifierAbout Ground Loops Device a Shielded cable Path Device B To AC power serviceSetting the Gain Properly System Setup and TestingOutput RELAYS/THERMAL Cycling Amplifier input clippingTroubleshooting Index TroubleshootingCare and Maintenance CleaningRefer ALL Servicing to Alesis Customers Outside the USA and Canada Obtaining Repair ServiceReference SpecificationsDimensioned drawings RA300 RA500 Architects and Engineers Specifications Index Please Register Your Product Online Alesis Limited WarrantyWarranty

RA150, RA500, RA300 specifications

The Alesis RA series of amplifiers—comprising the RA300, RA500, and RA150—have earned a respected spot in the audio equipment landscape, catering to both musicians and audio professionals. With a blend of innovative technology, robust performance, and user-friendly features, these amplifiers offer solutions for various sound requirements.

Starting with the RA300, this amplifier delivers a solid output of 150 watts per channel at 4 ohms, making it ideal for smaller studio setups or personal listening environments. It is built with a lightweight yet durable design, employing a modern Class AB architecture that ensures low distortion and high audio fidelity. The RA300 features comprehensive input options, including balanced XLR and quarter-inch TRS inputs, allowing seamless integration into diverse setups. Additionally, the built-in protection circuitry prevents overheating and damage during prolonged use, ensuring longevity and reliability.

The RA500 steps up the power and performance, presenting a robust 250 watts per channel at 4 ohms, making it suitable for larger venues and demanding applications. It utilizes advanced thermal management technology, which aids in efficient heat dissipation, ensuring the amplifier operates smoothly even under heavy load. The RA500 also boasts significant dynamic range and headroom, making it a preferred choice for professional environments where audio clarity and volume are paramount. The addition of a frequency response that spans from 20Hz to 20kHz means it can faithfully reproduce a wide range of audio frequencies.

Meanwhile, the RA150 serves as a versatile option for various applications, delivering 75 watts per channel at 4 ohms. Despite its compact size, the RA150 does not compromise on sound quality or functionality. Its Class AB amplifier technology results in enhanced audio accuracy, making it popular among beginner studios and educational settings. The straightforward controls and indicators ensure that users can quickly adjust settings for optimal performance.

All three amplifiers in the Alesis RA series share a common goal: to provide high-quality sound amplification without unnecessary complexity. Their combination of solid construction, advanced technologies, and thoughtful features make them suitable for a multitude of audio environments—from home studios to professional gigs. Whether you opt for the RA300, RA500, or RA150, you are investing in a reliable tool designed to deliver exceptional audio performance, catering to the needs of discerning audiophiles and professionals alike.