Alesis RA150, RA300, RA500 manual VOLT/230 Volt Operation, Fuse, Electrical Service to

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Connections: Chapter 2

120 VOLT/230 VOLT OPERATION

The Alesis Reference Series amplifiers feature dual- voltage operation. The AC input voltage is selected by a recessed switch on the back panel. The tab is recessed and a tool (small screw driver, pencil, pen, etc.) is required to shift from 120-volt to 230-volt operation. Units sold in areas with 120V power (as in the United States) should come with the switch already set to that position.

Before connecting the amplifier to AC power for the first time, make sure that this switch is set correctly for the country you're using the amp in.

If you change the voltage when travelling, you must also replace the power fuse with the proper amperage (see page 10) and obtain the proper detachable IEC power cable for the country.

FUSE

If the fuse blows, replace with a fuse of the correct type only; use of any higher amperage value will void the warranty. FUSES ARE FOR YOUR

PROTECTION—NEVERSUBSTITUTE A FUSE OF A HIGHER RATING, OR BYPASS IT.

All fuses are the "Slo-Blo" type, sized at 5mm diameter x 20mm:

Model

100-120 volt

220-240 volt

RA150

T3.15AL250V

T1.6AL250V

RA300

T6.3AL250V

T3.15AL250V

RA500

T10AL250V

T5AL250V

The fuse will not blow unless the unit is overstressed. Before replacing the fuse, correct the condition that caused it to blow in the first place.

ELECTRICAL SERVICE TO THE

RA150/300/500

One of the most important considerations for proper installation and operation of a power amplifier is the capacity of the circuit feeding the AC mains voltage to the amplifier. If the line does not have sufficient current and voltage capacity, the amplifier may not be able to deliver its full rated output, both steady state and peak, with the result that the sound character can dramatically suffer. In short, any amplifier will only sound good when connected to adequate AC power.

The maximum audio output rating of each amp (200 watts bridged for the RA150 to 1000 watts bridged for the RA500) does not represent the total AC power consumption by the unit. The following table shows the power consumption at rated output:

Model

Rated AC

Maximum

 

consumption

(peak)

RA150

270 watts

390 watts

RA300

500 watts

650 watts

RA500

840 watts

1080 watts

Note that in typical studio applications the average power consumption will be much less. When not being driven, current consumption is 30 watts or less. Under most circumstances, normal household or commercial power outlets will be adequate. (A standard 15-amp circuit is capable of supplying 1800 watts.) However, peak power consumption may momentarily be 100 to 200 watts higher on transient peaks; if you're connecting a lot of other equipment to the same circuit you should plan for an extra 20% headroom to avoid blowing a circuit breaker. Note that when multiple devices are plugged into a single AC outlet, the possibility of overheated connections can exist. Long AC extension cables may also degrade the supply power.

Electrical standards have taken enormous strides toward increased safety over the past few decades thanks to circuit breakers, ground fault interrupters, and improved wiring and insulation materials. Unfortunately, some clubs are situated in older buildings whose wiring may not meet current safety standards, or have wiring that has deteriorated over the years. Make sure the circuit supplying power to the RA150/300/500 can supply enough current to run it properly. If the circuit has to supply other high-powered consumption units such as

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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 ManualPower Considerations ConnectionsAC Cord and Grounding Electrical Service to VOLT/230 Volt OperationFuse Temperature Considerations in Rack Mounting Operating EnvironmentOther 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 CablesBalanced or UNBALANCED? To connect a balanced line output to feed the RA150/300/500To connect an unbalanced source to the amplifier input To use the amplifier in Bridged Mono mode To feed the same source to several different amplifiersConnectors OutputsWhats the Load IMPEDANCE? Speaker CablesConnecting Speaker Cables to Binding Posts To connect speaker cable to the connectorsTo connect a speaker in bridged mono mode Importance of Speaker PolarityOutput Connections for Bridged Operation Should you use bridged mode?ON-OFF Switch Volume ControlsMute Switch OperationMeters RA300 and RA500 Back Panel ControlsChecking 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 IndexCare and Maintenance CleaningRefer 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.
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