SWR SM-900 Bass Amp  

Product #482000

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This product has been discontinued but may be available as a used item.

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The SWR SM-900 Bass Amp has the power, the sound, and the versatility bass players dream of. It can be run mono, stereo, or biamped and delivers 350W RMS stereo and 800W mono into 4 ohms. It has 2 independent and footswitchable 3-band, semi-parametric EQs, sidechain stereo and mono effects loops, an effects blend control, tuner send, adjustable limiter, a built-in crossover, and an XLR record out with pad and ground lift. Fan cooled, rackmountable.

Features

  • FRONT PANEL:
  • All tube preamp gain stages
  • Dual independent input jacks compatible for both active and passive instruments
  • Gain control with LED peak clipping indicator
  • Limiter with variable threshold control
  • Exclusive Aural Enhancer circuitry
  • Master volume control w/clip LED indicator
  • Active bass and treble controls
  • 2 independent switchable
  • 3-band semi-parametric EQs
  • EQ footswitch
  • Effects blend control
  • Tuner send
  • Electronic crossover
  • Rackmountable
  • Bi Amp Crossover Point Control: 100Hz to 1000Hz
  • Crossover Slope: 12 dB per octave
  • Rack Handles
  • REAR PANEL:
  • Stereo and Mono Effects Loop
  • Balanced XLR Output with select switch for Line or Direct Mode
  • Ground lift & pad control
  • High and Low Crossover Outputs
  • Power Amp Assign Switch selects Bridge or Stereo Mode
  • SPEAKER OUTPUTS:
  • 2 - 1/4" jacks each for Left and Right Stereo Out
  • One Speakon jack for Left and Right Side Output
  • One Speakon Output Jack for Mono Operation
  • Speaker fuses (x2): 3AG, 10 Amp, Fast Blo
  • Line Fuse: 3AG, 8 Amp, Slow Blo
  • On/Off Switch
  • INTERNAL:
  • (1) 12AX7 Preamp Tube
  • Cooling fan
  • FREQUENCY RESPONSE: (Power amplifier): -3dB @ 20Hz and 40KHz
  • SENSITIVITY:
  • Full output, 8 ohm load, 100Hz
  • Passive Input Jack: 50 millivolts
  • Active Input Jack: 200 millivolts
  • Power Amplifiers (Effects Return Jack "in"):1.6 volts
  • DiISTORTION:
  • Power Amplifiers (Effects Return Jack "in"): 0.03% THD
  • I.M. Distortion: 0.06%
  • System Distortion
  • (Gain and Master Volume full, Enhancer at minimum
  • and Tone controls set flat): 0.4% THD
  • SIGNAL TO NOISE RATIO: -75dB (EQUIVALENT INPUT NOISE: 8.9 microvolts
  • INPUT IMPEDANCE:
  • Passive/Active Input: 800kOhms
  • Active Input: 60kOhms
  • Effects Return: 27kOhms
  • OUTPUT IMPEDANCE:
  • Effects Send: 100 Ohms
  • Tuner Send: 100 Ohms
  • XLR:1.5kOhms
  • Crossover High and Low Outs: 100 Ohms
  • SUGGESTED SPEAKER ENCLOSURES:
  • Megoliath
  • Goliath Senior
  • Big Bertha
  • Goliath III
  • SUGGESTED SPEAKER COMBINATIONS:
  • (2) Goliath IIIs
  • (2) Son Of Berthas
  • (1) Goliath III & (1) Son Of Bertha
  • (1) Goliath III & (1) Big Ben

You're serious about your music. Get a head that matches your commitment. Order today.

 

SM-900 Bass Amp Specifications:

  • DIMENSIONS: 19" W x 3-9/20" H x 13-3/4" D
  • WEIGHT: 26 lbs.
  • POWER OUTPUT:
  • Bridge/Mono Mode 900 Watts @ 4 Ohms, 650 Watts @ 8 Ohms, 440 Watts @ 16 Ohms (minimum load = 4 Ohms)
  • Stereo Mode (per side): 400 watts @ 4 Ohms, 240 watts @ 8 Ohms, 144 watts @ 16 Ohms (minimum load = 2 Ohms)
  • DISTORTION:
  • Power Amplifiers (Effects Return Jack "in"): 0.03% THD
  • I.M. Distortion: 0.06%
  • System Distortion (Gain and Master Volume full, Enhancer at minimum
  • and Tone controls set flat): 0.4% THD
  • SIGNAL TO NOISE RATIO: -75dB (<8 millivolts typical)
  • EQUIVALENT INPUT NOISE: 8.9 microvolts
  • INPUT IMPEDANCE:
  • Passive/Active Input: 800kOhms
  • Active Input: 60kOhms
  • Effects Return: 27K Ohms
  • OUTPUT IMPEDANCE
  • Effects Send: 100 Ohms
  • Tuner Send: 100 Ohms
  • XLR:1.5kOhms
  • Crossover High and Low Outs: 100 Ohms
  • SUGGESTED SPEAKER ENCLOSURES
  • Megoliath
  • Goliath Senior
  • Big Bertha
  • Goliath III
  • SUGGESTED SPEAKER COMBINATIONS
  • (2) Goliath IIIs
  • (2) Son Of Berthas
  • (1) Goliath III & (1) Son Of Bertha
  • (1) Goliath III & (1) Big Ben
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REVIEW SNAPSHOT®

by PowerReviews
SWRSM-900 Bass Amp
 
5.0

(based on 1 review)

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(3 of 3 customers found this review helpful)

 
5.0

SWR at it's best. . . .. . . .

Comments about SWR SM-900 Bass Amp:

Most guys would say that when it comes to bass amps, you can't really tell the difference between a solid-state amp and hybrid tube pre-amp head. But this bad boy gives you a warm tube sound without dealing with an unreliable, oversized tube amp.

When I first picked up the SM-900 some years ago, I really felt it was one of the best amp heads in the market. I think what sold me on this amp was that the power amp works like a PA power amp in that you can switch it to Mono full power, or (if you're using small cabinets) you can switch it to Stereo Mode to protect your gear from overloading. Remember: Most amp heads will only work at 4 ohms minimum load. The SM-900, in stereo mode, works at 2 ohm minimum per side. So technically, you can plug in all kinds of cabinets in Stereo Mode and you'll have a volume knob for each side. So if you have two 4-ohm cabinets, you'll want to run it Stereo and each cabinet will get 400 watts.

My favorite feature is the 3 band semi-parametric EQ. It has 2 knobs for the low mid, 2 knobs for the center mid, and two knobs for the high mid, plus bass &amp; treble controls. So you can get any sound want out of this bad boy. I just leave the bass &amp; treble knobs in the center and use the low mid and high mid as my bass &amp; treble.

It has 2 effects loops. One is stereo and one is mono. With the stereo loop you can run effects thru one cabinet and not the other. That way you can run an overdrive through your rig without losing the overall tone of your bass. That's another feature that makes the SM-900 unique.

It has a few features I've never used. I don't know why you would need 2 EQ's unless you're using 2 basses at a gig. You can combine the EQ's together but it gets confusing because now the knobs cut/boost 7 db instead of 15 db. So I just use one EQ. That being said, I've never used the EQ footswitch, either.

It also has a built-in crossover that I've never used. Basically, it sends the highs to one cabinet and lows to another. But then you won't get the most out of your speakers, at least that's my opinion.

I sold all my big cabinets and am now just using two small cabs (that was the only way I could fit my gear in the car.) But when I just use one cab, I have to set the amp to Stereo Mode and it only puts out about 250 watts which is not a whole lot. But I'm afraid to set it to Mono because then it'll fry the speaker, maybe.

I was recently tightening up the nuts and bolts in the back of the amp. Apparently, I used the wrong tool and one of the bolts came off. I took it apart, stuck my hand inside to fix the Tuner-Out output and it busted. I've never used the Tuner-Out either and that's what I get for messing with it.

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