Alesis RA300, RA150, RA500 manual Obtaining Repair Service, Customers Outside the USA and Canada

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Chapter 4: Troubleshooting

OBTAINING REPAIR SERVICE

Before contacting Alesis, check over all your connections, and make sure you’ve read the manual.

Customers in the USA and Canada: If the problem persists, contact Alesis USA at www.alesis.com & find the Product Support web page. Make

sure you have the unit’s serial number with you. If necessary contact one of our technicians;

if appropriate, you will be given a return order (RO) number and instructions on how to return the unit. All units must be shipped prepaid and COD shipments will not be accepted.

For prompt service, indicate the RO number on the shipping label. Units without an RO will not be accepted. If you do not have the original packing, ship the unit in a sturdy carton, with shock- absorbing materials such as Styrofoam pellets (the kind without CFCs, please) or “bubble-pack” surrounding the unit. Shipping damage caused by inadequate packing is not covered by the Alesis warranty.

Tape a note to the top of the unit describing the problem, include your name and a phone number where Alesis can contact you if necessary, as well as instructions on where you want the product returned. Alesis will pay for standard one-way shipping back to you on any repair covered under the terms of this warranty. Next day service is available for a surcharge. Field repairs are not authorized during the warranty period, and repair attempts by unqualified personnel may invalidate the warranty.

CUSTOMERS OUTSIDE THE USA AND CANADA:

Contact your local Alesis distributor for any warranty assistance. The Alesis Limited Warranty applies only to products sold to users in the USA and Canada. Customers outside of the USA and Canada are not covered by this Limited Warranty and may or may not be covered by an independent distributor warranty in the country of sale. Do not return products to the factory unless you have been given specific instructions to do so.

Internet Address: Important information and advice is available on our web site:

http://www.alesis.com

Email may be addressed to:

Support@alesis.com

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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 FeaturesConnections Power ConsiderationsAC Cord and Grounding VOLT/230 Volt Operation Electrical Service toFuse Operating Environment Temperature Considerations in Rack MountingOther 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 TipsTo connect a balanced line output to feed the RA150/300/500 Balanced or UNBALANCED?To 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 SwitchBack Panel Controls Meters RA300 and RA500Checking 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 TroubleshootingCleaning Care and MaintenanceRefer 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.
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