Alesis RA300, RA150, RA500 manual About this Manual, Reference Series Features

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Introduction: Chapter 1

Reference Series Features-

DC coupled, fully complementary discrete amplifier topology

Actively biased, dual differential input stages

Wide bandwidth, low distortion design

Fully protected from all fault conditions

LED output level metering (RA 300, RA 500)

Front panel level controls

Overload/Fault indicators

Bridged mono operation

Balanced 1/4” & RCA single-ended input connectors

XLR input connectors (RA 300, RA 500)

Heavy-duty, dual binding post output connectors

Relay-controlled turn on/off

Silent, convection-cooled design

Heavy-duty steel chassis

ABOUT THIS MANUAL

In most respects, the three different amplifiers covered by this manual are similar except for their power ratings. Operational differences will be noted individually.

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RA150/300/500 Reference Manual

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Contents Power Amplifiers Reference SeriesAlesis Contact Information Contents HOW to USE this Manual IntroductionImportant Safety Instructions Safety Symbols Used in this ProductSymboles Utilisés Dans CE Produit Instructions DE Sécurité Importantes FrenchLesen Sie die Hinweise CE Declaration of Conformity EMCPrincipal Features Reference Series Features About this ManualConnections Power ConsiderationsAC Cord and Grounding VOLT/230 Volt Operation Electrical Service toFuse Operating Environment Temperature Considerations in Rack MountingOther Rack Mounting Tips Mounting on a Shelf or in a NON-RACK Enclosure Avoiding Electromagnetic InterferenceInput Jack Characteristics InputsBalanced wiring of an XLR input Connector To use an unbalanced source with an Alesis amplifierCable Wiring Tips CablesTo connect a balanced line output to feed the RA150/300/500 Balanced or UNBALANCED?To connect an unbalanced source to the amplifier input To use the amplifier in Bridged Mono mode To feed the same source to several different amplifiersWhats the Load IMPEDANCE? ConnectorsOutputs Speaker CablesConnecting Speaker Cables to Binding Posts To connect speaker cable to the connectorsOutput Connections for Bridged Operation To connect a speaker in bridged mono modeImportance of Speaker Polarity Should you use bridged mode?Mute Switch ON-OFF SwitchVolume Controls OperationBack Panel Controls Meters RA300 and RA500Checking for Proper Polarity Using the RA150 AS a Headphone Amplifier Choosing the Correct SpeakersDevice a Shielded cable Path Device B To AC power service About Ground LoopsSystem Setup and Testing Setting the Gain ProperlyAmplifier input clipping Output RELAYS/THERMAL CyclingTroubleshooting Troubleshooting IndexCleaning Care and MaintenanceRefer ALL Servicing to Alesis Obtaining Repair Service Customers Outside the USA and CanadaSpecifications ReferenceDimensioned drawings RA300 RA500 Architects and Engineers Specifications Index Alesis Limited Warranty Please Register Your Product OnlineWarranty

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.