Alesis RA150 User Manual

Alesis RA150 Manual

Get Alesis RA150 PDF manuals and user guides View all Alesis RA150 manuals
Add to My Manuals
Save this manual to your list of manuals

Alesis RA150 manual content summary:

  • Alesis RA150 | User Manual - Page 1
    REFERENCE SERIES ™ ™ ™ POWER AMPLIFIERS REFERENCE MANUAL ©2000 Alesis Corporation
  • Alesis RA150 | User Manual - Page 2
    "Reference Series" are trademarks of Alesis Studio Electronics, Inc. ALESIS CONTACT INFORMATION Alesis Studio Electronics, Inc. 1633 26th Street Santa Monica, CA 90404 USA Do not use this address for repair service. Telephone: E-Mail: Website: 800-5-ALESIS (800-525-3747) [email protected]
  • Alesis RA150 | User Manual - Page 3
    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
  • Alesis RA150 | User Manual - Page 4
    /Safety Instructions INTRODUCTION Thank you for purchasing this Alesis RA150, RA300, or RA500™ Reference Series power amplifier. To take full advantage of this amplifier's functions, and to enjoy long and trouble-free use, please read this user's manual carefully. HOW TO USE THIS MANUAL This manual
  • Alesis RA150 | User Manual - Page 5
    when moving the cart/apparatus combination to avoid injury from tip-over. 14. Refer all servicing to qualified service personnel. Servicing is required when the apparatus has been damaged in any way, such as when the power-supply cord or plug is damaged, liquid has been spilled or objects have
  • Alesis RA150 | User Manual - Page 6
    tirent sur des appareils et leur support. 1. Lisez ces instructions. 2. Gardez ces instructions. 3. Tenez compte de tous les avertissements. 4. Suivez toutes les instructions. 5. N'utilisez pas cet allareil bourdonnement dans les oreilles, consultez un spécialiste. 4 RA150/300/500 Reference Manual
  • Alesis RA150 | User Manual - Page 7
    Introduction/Safety Instructions BEIM BENUTZEN DIESES PRODUKTES BEACHTEN SIE BITTE DIE FOLGENDEN SICHERHEITSHINWEISE: Gerät gelangt sind, das Gerät dem Regen oder Feuchtigkeit ausgesetzt war RA150/300/500 Reference Manual und deshalb nicht mehr normal arbeitet oder heruntergefallen ist. 14. Dieses
  • Alesis RA150 | User Manual - Page 8
    Instructions CE DECLARATION OF CONFORMITY Manufacturer's Name: Manufacturer's Address: declares, that the product: Product Name: Model Type: Alesis Corporation 1633 26th Street Santa Monica, CA 90404 USA RA150/300/500 Audio amplifier +44.1462.480800 October 2000 6 RA150/300/500 Reference Manual
  • Alesis RA150 | User Manual - Page 9
    panel connectors (except RA 150). All models feature detented front panel input level controls, and overload/protect indicators. The RA300 and RA500 amplifiers incorporate bar graph LED power metering. INPUTS AND OUTPUTS The input sections of the amplifiers utilize precision electronically-balanced
  • Alesis RA150 | User Manual - Page 10
    (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
  • Alesis RA150 | User Manual - Page 11
    or other enclosure. The shipping carton should contain the following items: • RA150/300/500 amplifier • This instruction manual • Power cable • Alesis Warranty card POWER CONSIDERATIONS THE AC CORD AND GROUNDING The RA150/300/500's IEC-spec AC cord (do not substitute any other type of AC cord) is
  • Alesis RA150 | User Manual - Page 12
    Chapter 2 120 VOLT/230 VOLT OPERATION The Alesis Reference Series amplifiers feature dualvoltage operation. The AC input voltage 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
  • Alesis RA150 | User Manual - Page 13
    to mount it in the bottom of the rack frame. Support of the back of the unit may be necessary for portable or road use. • Alesis Reference amplifiers are well shielded; however, mounting low-level electronics some distance away from power amplifiers is common practice to reduce the possibility of
  • Alesis RA150 | User Manual - Page 14
    "Temperature Considerations in Rack Mounting" no matter where or how the amp is mounted. AVOIDING ELECTROMAGNETIC INTERFERENCE Because the RA150/300/500 contains a large power transformer, we recommend that you do not: • Place the RA150/300/500 next to an unshielded video monitor, as the magnetic
  • Alesis RA150 | User Manual - Page 15
    such as mixers, synthesizers, samplers, direct boxes, crossovers, etc. Electric guitars, microphones, and other lowlevel/high-impedance output devices require a preamp. Phone Jack Sleeve Tip Ring RCA/phono jack Shell Pin -- RA300 Back Panel RA500 Back Panel RA150/300/500 Reference Manual 13
  • Alesis RA150 | User Manual - Page 16
    power is off prior to connecting or disconnecting any signal wiring. The input circuits of the Alesis amplifiers are electronically balanced. They may be fed from either symmetrical ("balanced") or unbalanced sources. On the RA300 and RA be done with shielded cable. 14 RA150/300/500 Reference Manual
  • Alesis RA150 | User Manual - Page 17
    unplugging will solve the problem. • Keep the cable • Although Alesis does not endorse any specific product, chemicals RA150/300/500 is carrying a signal, and the level is turned up. RA150/300/500 Reference Manual Chapter 2: Connections CABLE WIRING TIPS If you decide to wire your own cables, Alesis
  • Alesis RA150 | User Manual - Page 18
    amplifier or transformer will reject the interference to a great degree. This tendency to ignore interference is called Common Mode Rejection. To connect a balanced line output to feed the RA150/300/500: You have two options: TRS-to-TRS cable Most modern mixing consoles, such as the Alesis Studio
  • Alesis RA150 | User Manual - Page 19
    Advantages: Good frequency response specs, no inherent hum pickup, less expensive than transformers. Disadvantages: Requires power, generates some noise. Chapter 2: Connections To feed the same source to several different amplifiers: The input impedance of the Alesis amplifiers is 20 kΩ in balanced
  • Alesis RA150 | User Manual - Page 20
    OUTPUTS Warning: Be sure that the AC power is off prior to connecting or disconnecting any signal wiring. WHAT'S THE LOAD IMPEDANCE? Alesis amplifiers can reliably drive 4 Ω loads in Stereo several amps of 150 100 60 at 8Ω meters 740 488 290 183 114 73 46 30 18 18 RA150/300/500 Reference Manual
  • Alesis RA150 | User Manual - Page 21
    other heavy-duty wiring. While Alesis does not endorse any particular brand POSTS The RA150/300/500 connectors are perfect for studio installations, banana plug into the amplifier, make sure that: • The red and black wire nuts in the amplifier have been screwed down RA150/300/500 Reference Manual 19
  • Alesis RA150 | User Manual - Page 22
    speaker and system polarity, see page 22. OUTPUT CONNECTIONS FOR BRIDGED OPERATION Instead of using the RA150/300/500 as a stereo 2channel amplifier, it is possible to use it as a mono amplifier with twice the power. This uses both sides of the amplifier in a push-pull configuration, so the speaker
  • Alesis RA150 | User Manual - Page 23
    RA150/300/500 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 RA150/300/500, then chase down the source of the problem. RA150/300/500 Reference Manual
  • Alesis RA150 | User Manual - Page 24
    power output of each channel. The highest (red) LED indicates the unit is at maximum output, at the onset of clipping. The orange PROTECT LEDs come on when the unit is 6 dB below rated output. Operation with the PROTECT LED on continuously will lead to amplifier . 22 RA150/300/500 Reference Manual
  • Alesis RA150 | User Manual - Page 25
    excellent fidelity, and lack of a noise-generating fan, the RA150/300/500 "Reference Amplifier" excels in driving reference near-field monitor speakers in smaller studios. However, you should choose speakers that can handle the power the RA150/300/500 can generate. Speaker wattage ratings are often
  • Alesis RA150 | User Manual - Page 26
    balancing transformer or direct box as mentioned on page 16 "Adapting the RA150/300/500 to Balanced Lines," to provide isolation in the audio line between the two pieces of gear. Transformers generally have no ground connection between the input and output connections. RA150/300/500 Reference Manual
  • Alesis RA150 | User Manual - Page 27
    this, the input gain controls of the RA150/300/500 must be turned down to avoid amplifier clipping. Most mixers output +4 dBu at nominal level/0 VU; that means if you go "into the yellow" on the meter of most mixers, the amp will be clipping its outputs or distorting the speakers unless you turn
  • Alesis RA150 | User Manual - Page 28
    is clipping or the amplifier input stage is overloaded. In either case, no amount of level control adjustment at the amplifier can remove this distortion, and you should lower the output level of the device feeding the amplifier until the distortion stops. OUTPUT RELAYS/THERMAL CYCLING Reference
  • Alesis RA150 | User Manual - Page 29
    (or available). If you experience problems while operating your RA150/300/500, please use the following table to locate possible causes and solutions before contacting Alesis Product Support for assistance. Symptom No audio from outputs Low output power Bass disappears, speakers sound out of
  • Alesis RA150 | User Manual - Page 30
    power and let amplifier cool down Defective loudspeaker drivers Replace drivers In a multi-amplified system with a low level crossover network, bad outputs cloth to clean the unit. REFER ALL SERVICING TO ALESIS We believe that the RA150/300/500 is one of the best amplifiers that can be made using
  • Alesis RA150 | User Manual - Page 31
    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: [email protected] RA150/300/500 Reference Manual 29
  • Alesis RA150 | User Manual - Page 32
    SPECIFICATIONS Reference 150 Size Rack units Weight Rated output, per channel 4 ohms @ 1kHz, .02% THD+N 8 ohms @ 1kHz, .05% THD+N 8 ohms, bridged mono mode 18.9" W x 3.9" H x 10.25" D (480mm x 99 mm x 260 mm) 2RU height 15lbs = 6.8Kg 75 watts RMS per channel 45 watts RMS per channel 150
  • Alesis RA150 | User Manual - Page 33
    Specifications Reference 500 Size Rack units Weight Rated output, per channel 28.5lbs = 13.0Kg 250 watts RMS per channel 150 watts RMS per channel 500 watts RMS 105dB, 22Hz-22kHz bandwidth referenced to rated output 10Hz - 70kHz +0, -3dB 200 60 V/µs (two RA150 RA150/300/500 Reference Manual 31
  • Alesis RA150 | User Manual - Page 34
    Specifications RA300 RA500 32 RA150/300/500 Reference Manual
  • Alesis RA150 | User Manual - Page 35
    Reference Manual Specifications The chassis shall be rack mountable in a standard 19" EIA equipment rack. Output connectors shall be two-way binding posts capable of accepting heavy gauge wire or banana-type connectors. The power output of the amplifier shall be 75 watts per channel (RA150), 150
  • Alesis RA150 | User Manual - Page 36
    , 14 polarity, 20 how to test, 22 power output, 30 Power cable, 3 power loss in speaker cable, 18 protection, 7 Rack Mounting, 11 RCA/phono input jacks. See Repair Service, 29 Safety, 3, 24 shield telescoping, 24 sound level meter, 25 Specifications, 30 thermal protect mode, 27 transformer input
  • Alesis RA150 | User Manual - Page 37
    countries please refer to your local distributor. ALESIS Los Angeles, California USA www.alesis.com PLEASE REGISTER YOUR PRODUCT ONLINE: WWW.ALESIS.COM Alesis, Los Angeles, CA USA © 2000 Alesis Specifications Subject To Change Without Notice 7-51-0097 11/00 RA150/300/500 Reference Manual 35
  • Alesis RA150 | User Manual - Page 38
    Warranty 36 RA150/300/500 Reference Manual
  • 1
  • 2
  • 3
  • 4
  • 5
  • 6
  • 7
  • 8
  • 9
  • 10
  • 11
  • 12
  • 13
  • 14
  • 15
  • 16
  • 17
  • 18
  • 19
  • 20
  • 21
  • 22
  • 23
  • 24
  • 25
  • 26
  • 27
  • 28
  • 29
  • 30
  • 31
  • 32
  • 33
  • 34
  • 35
  • 36
  • 37
  • 38
REFERENCE SERIES
POWER AMPLIFIERS
R
EFERENCE
M
ANUAL
©2000 Alesis Corporation
™
™
™