Table of Contents
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Table of Contents
Related Manuals for Alesis RA-100
Summary of Contents for Alesis RA-100
- Page 1 ALESIS RA-100 Reference Manual...
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Page 2: Table Of Contents
CHAPTER 1 – GETTING TO KNOW THE RA-100 1.1 INTRODUCTION...1 Principal Features...1 Unpacking and Inspection...3 About This Manual...4 CHAPTER 2 – INSTALLATION 2.1 REAR PANEL CONNECTIONS...5 2.2 POWER CONSIDERATIONS...5 Fuse...5 The AC Cord...5 Electrical Service to the RA-100...6 2.3 OPERATING ENVIRONMENT...6 Thermal Considerations in Rack Mounting...6 Mounting on a Shelf or in a Non-Rack Enclosure...7 Avoiding Electromagnetic Interference...8... - Page 3 4.4 GUITAR AMPLIFICATION SYSTEM...20 4.5 BIAMP SOUND REINFORCEMENT...21 CHAPTER 5 – MAINTAINANCE/SERVICE 5.1 GENERAL INFORMATION...22 Cleaning...22 Maintenance...22 Refer All Servicing to Alesis...22 CHAPTER 6 – TROUBLESHOOTING Hum...23 No Volume...23 Distorted or Low Level Sound...23 Thin Sound/Sound that Changes Unpredictably in a Room...23 CHAPTER 7 –...
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Page 4: Introduction
With low-cost digital devices now offering sound quality unheard of only a few years ago, Alesis has applied its expertise toward creating a sonically accurate, stable, and affordable stereo power amplifier that’s suitable for the digital age. - Page 5 RA-100 uses several stabilization techniques to maintain consistent feedback network characteristics. • Alesis recognizes that amplifiers will sometimes be driven into clipping— even though this is not good practice—during a recording session or under the pressures of live performance. As a result, a great of deal of research went into creating the best possible clipping entry/recovery characteristics.
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Page 6: Unpacking And Inspection
(e.g., a short across the speaker terminals) is removed, the signal recovers instantly. • Alesis also recognizes that whatever else, “the show must go on.” As a result, under conditions of extreme abuse (such as ultra-low speaker impedances or mounting that allows for no ventilation), the RA-100 will limit its signal rather than simply shut down. -
Page 7: About This Manual
• Alesis RA-100 power amp with the same serial number as shown on the shipping carton • Power cord. • Four stick-on rubber feet (for shelf mounting, to prevent the RA-100’s bottom surface from scratching the shelf) • Alesis warranty card. It is important to register your purchase; if you have not already filled out your warranty card, please do so now. -
Page 8: Chapter 2: Installation
CHAPTER 2: INSTALLATION 2.1 REAR PANEL CONNECTIONS The following diagram shows the various rear-panel components. Please refer to this diagram during the procedures described in this chapter. Fuse: 5 Amps (A spare fuse in included in the fuse holder) 2.2 POWER CONSIDERATIONS Fuse Replace with a 5 Amp, slow-blow type only;... -
Page 9: Electrical Service To The Ra-100
A THREE-TO-TWO WIRE ADAPTER, CREATES A HAZARDOUS CONDITION. ALESIS CANNOT BE RESPONSIBLE FOR PROBLEMS CAUSED BY USING THE RA-100 OR ANY ASSOCIATED EQUIPMENT WITH IMPROPER AC WIRING. Electrical Service to the RA-100 Although the RA-100 has a maximum audio output rating of 200 watts total into 4 , this does not represent the total current consumption since there are certain inefficiencies inherent in linear amplifier design. -
Page 10: Mounting On A Shelf Or In A Non-Rack Enclosure
Mounting on a Shelf or in a Non-Rack Enclosure To mount the amplifier on a shelf or other flat surface, Alesis recommends using the enclosed stick-on feet to avoid scratching the shelf’s surface with the amplifier bottom. -
Page 11: Avoiding Electromagnetic Interference
amp is mounted. Avoiding Electromagnetic Interference Because the RA-100 contains a large power transformer, we recommend that you do not: • Place the RA-100 next to an unshielded video monitor, as the magnetic fields may distort the image. • Place tapes, disks, or other magnetic media close to the RA-100. •... -
Page 12: Cable Wiring Tips
Cable Wiring Tips If you decide to wire your own cables, Alesis recommends that you use two conductor shielded cable (even in an installation that uses unbalanced wiring) with either a braided or foil-type shield. Connect one conductor to the phone jack tip connection to carry the hot signal, and the shield connection to the sleeve. - Page 13 Disadvantages: Requires power, generates some noise. • 1622 mixer. Inputs 1-8 of the Alesis 1622 mixer include balanced line inputs as well as direct-to-tape unbalanced outputs and unbalanced signal send points. You can plug a balanced line signal into the balanced XLR input, then patch either the direct out or send connection to the RA-100.
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Page 14: Outputs
along with ground, into the RA-100. The following diagram shows an adapter that assumes pin 2 of the XLR connector is “hot.” Female XLR Connector If pin 3 is hot, then do not connect pin 2 to anything, and connect the wire from the 1/4”... -
Page 15: Connecting Cables To Push Connectors
While Alesis does not endorse any particular brand of cable, we suggest that you investigate different cable types for yourself to discover if they improve the sound of your particular setup. -
Page 16: The Importance Of Speaker Polarity
required that still maintains the great cost/performance ratio of the RA-100's design. In addition, push connectors are very easy to set up. To connect cable to the push connectors, remove approximately 1/4" of insulation from the end of the wire, being careful not to nick any of the strands. Twist the strands together, press the push terminal button, and feed the strands through the exposed hole in the push connector. -
Page 17: Chapter 3: Using The Ra-100
For this reason, the RA-100 should always be turned off first. However, Alesis realizes that in many applications the RA-100 power switch will be left on and the RA-100, along with other gear, will be switched on by a master AC switch. -
Page 18: Mute Switch
Mute Switch Because turning the RA-100 on and off generates no spikes within the amplifier, the power switch doubles as a mute switch or “panic button.” For example, if there is a serious feedback problem, you can simply turn off the RA-100, then chase down the source of the problem. -
Page 19: About Ground Loops
Near-field monitoring through “reference” speakers has become the preferred way to monitor and mix music. With near-field monitoring, small speakers are placed so that they are a few feet from the engineer’s ears. As a result, room acoustics become less important since the primary acoustic interaction involves direct sound from the speakers rather than reflected sounds from the room. - Page 20 One path goes from device A to ground via the ground terminal of the three- conductor AC power cord, but A also sees a path to ground through the shielded cable and AC ground of device B. Because ground wires have a small amount of resistance, small amounts of current can flow through ground and generate a voltage along the cable shield.
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Page 21: Chapter 4: Typical Applications
For auditorium and live music use, the RA-100 has sufficient power to drive a set of small-to-medium size club speakers. The hookup diagram is the same as above, with an Alesis 1622 mixer feeding the RA-100, and the RA-100 driving the speakers. -
Page 22: Keyboard Amplification System
With multiple keyboard setups, you may need a mixer to combine the keyboard outputs into a single stereo feed. The Alesis 1622 Mixer is ideal for this type of application. The QuadraVerb can either process the 1622’s outputs on the way to the power amp as shown, or be inserted into the 1622 and use the 1622’s send/return effects capabilities. -
Page 23: Guitar Amplification System
4.4 GUITAR AMPLIFICATION SYSTEM Inputs Quadraverb GT MIDI Foot Pedal MIDI In Outputs RA-100 Speakers Many guitarists now use rack mount, component systems for greater flexibility compared to “all-in-one” amps. In this system, a guitar goes through a QuadraVerb GT to provide distortion, chorusing, reverb, and other effects. -
Page 24: Biamp Sound Reinforcement
(and high frequency speakers won’t receive low frequencies). In this setup, an Alesis 1622 mixer feeds a crossover that generates the separate high and low frequency splits. The low frequencies go to one RA-100 which drives the low frequency speaker system;... -
Page 25: Maintenance & Service
• Place a dust cover over the RA-100 when it is not in use. Refer All Servicing to Alesis Alesis has spent a great deal of effort researching power amplifier reliability. We believe that the RA-100 is one of the most reliable amplifiers that can be made using current technology, and should provide years of trouble-free use. -
Page 26: Chapter 6: Troubleshooting
CHAPTER 6: TROUBLESHOOTING Begin the troubleshooting process by re-reading the manual to make sure you didn’t miss some important point regarding the unit’s operation. After that, try the following techniques for specific problems. Turn down the volume controls. If the hum goes away, then the source of the hum is either in a unit feeding the RA-100, or in the input cables feeding the RA-100. -
Page 27: Chapter 7: Specifications
CHAPTER 7: SPECIFICATIONS...
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