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SWR SM-900 User Manual

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SM-900
SM-900
USER GUIDE
USER GUIDE
SWR SOUND CORP. • SUN VALLEY, CA • USA

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  Summary of Contents for SWR SM-900

  • Page 1 SM-900 SM-900 USER GUIDE USER GUIDE SWR SOUND CORP. • SUN VALLEY, CA • USA...
  • Page 2: Important Safety Instructions

    IMPORTANT SAFETY INSTRUCTIONS CAUTION: TO REDUCE RISK OF ELECTRIC SHOCK, DO NOT REMOVE THE COVER OR BACK. NO USER-SERVICEABLE PARTS INSIDE. PLEASE REFER TO A QUALIFIED SERVICE TECHNICIAN. A. Read Instructions: All safety and operation instructions should be read before the product is operated. B.
  • Page 3 INTRODUCTION INTRODUCTION The SM-900 is truly the “State of SWR’s Art” in bass amplification electronics. The SM-900 is only slightly deeper and heavier than the SM-500, yet delivers twice the power and includes new features such as our very flexible tone section. Along with shelving-type Bass and Treble controls, the equalization section consists of two independent 3-band semi-parametric EQs.
  • Page 4: Input Impedance

    EQUIVALENT INPUT NOISE: 8.9 microvolts DISTORTION: Power Amplifiers (Effects Return jack “in”): 0.03% THD I.M. Distortion: 0.06 % System Distortion (gain & master volume full, Aural Enhancer at min., tone controls flat): 0.4 % THD 2 • SM-900 USER GUIDE...
  • Page 5: Thermal Protection

    FRONT PANEL FEATURES & OPERATING PROCEDURES EQ FOOTSWITCH JACK For remote selection of the equalizers, insert the footswitch that came with your SM-900 into this jack. Installing the footswitch will automatically DISCONNECT the manual EQ slide switch located directly above the Aural Enhancer.
  • Page 6: Gain Control

    1 volt RMS. Basses with really “hot” pickups may be more compatible with the Active input. Let your ears be the judge. If you are using a KEYBOARD or BASS PEDAL, etc., with the SM-900, we have found the best choice to be the Active input.
  • Page 7 TONE CONTROLS AND EQUALIZATION: A BASIC PRIMER The flexibility of the tone and EQ sections of the SM-900 is one of the most elaborate we have developed. They have the ability to correct “dead” and “hot” spots that may be inherent in your instrument, poor room acoustics, and can bring life to old strings, correct peaks or dips in speaker systems, and best of all, bring out the sonic qualities of your instrument and YOUR playing technique.
  • Page 8: Bass And Treble Controls

    The Bass control is a “shelving” type tone control, with the shelving point set at about 120Hz. The Treble control is also a shelving tone control whose shelving point is about 2.5kHz. Starting from mid-position, turning the control counter-clockwise cuts the highs and turning the control clockwise 6 • SM-900 USER GUIDE...
  • Page 9: Crossover Frequency

    The following two pages include suggested settings to get you acquainted with the limitless variety of tones possible with the SM-900. By setting EQ 1 to the “Acoustic 360” and EQ 2 to the “Grand Piano” settings, for example, you can switch back and forth with the footswitch and see the variety of diverse sounds available to you on the SM-900.
  • Page 10 TONE CHARTS AND SUGGESTIONS Reggae Jazz Slap/Pop Rock 8 • SM-900 USER GUIDE...
  • Page 11 Grand Piano Acoustic 360 Pick (Mute Strings) Smoke-Inna-Godda-Da-Iron Man (Passive Input, Max. Gain) SM-900 USER GUIDE • 9...
  • Page 12 “fatter” sound is achieved. The Limiter circuit in the SM-900 adds NO noise and very little distortion. You should also notice that there is little “pumping” or “drop off” as experienced in lesser-quality units. The design of the limiter circuit has what is known as a “soft knee.”...
  • Page 13: Rear Panel Features

    They do NOT affect the level of the record XLR output in the “line” position. This configuration allows the user added flexibility when using the SM-900 in Stereo mode. For example: You are using the left channel for your monitoring and the right channel is across the stage next to the drummer. The independent Master Volume controls allow you to set a different level for each situation.
  • Page 14 This allows the user to utilize effects without sacrificing a solid bottom end. To bi-amp with the SM-900, run patch cables from the Crossover Outs to each of the Stereo effects returns (i.e., one cable from the “High” out jack to the Left stereo effects return, and one cable from the “Low”...
  • Page 15: Effects Loop

    (see diagram, page 20). If you wish to use just the internal power amps in the SM-900, the Effects Return jacks will serve as the “inputs.” Insert your MONO signal source in the MONO Effects Return jack. This will send the source to both power amps.
  • Page 16: Speaker Output Jacks

    2 ohms per side. When used in Bridge Mode, the SM-900 will deliver 440 watts into 16 ohms, 650 watts into 8 ohms and 900 watts into 4 ohm loads. Please make sure the speakers you use in this mode can handle the power.
  • Page 17: Power Switch

    If you notice the fan is still engaged after playing through your SM-900, let it run for a couple of min- utes to cool itself off. This will help extend the life of the internal components. Upon powering up the SM-900, you will notice an initial turn-on transient heard as a “thud” in your speakers.
  • Page 18 At least once a month, remove the SM-900 from the case and tighten all outside screws, especially on the front panel, and wipe off the outside of the chassis with a damp cloth. Then check all the connections in your rack case and reinstall your unit.
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  • Page 23: Limited Warranty

    In the case where the unit must be shipped, pack your unit carefully (using original packaging whenever possible), and include a copy of your bill of sale. Ship the unit PREPAID to the SWR Authorized Service Center of your choice.