Top of the SWR line!

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.

SWR SM-900 Bass Amp 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 (<8 millivolts typical)
• 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.

SWR 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

SWR SM-900 Bass Amp

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Average of 11 User Ratings

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Customer Reviews

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Sounds SWEET, Runs Hot

Posted by Rockbass King from NE on Nov 4, 2009

Experience w/product: I own it

Reviewer's Background: Active Bassist

Reviewer's Play Style: Rock

As a bass player, I am always in the search for the ultimate 'bass tone' from my gear. Of course, this changes everytime I play - but regardless. Recorded in NYC with this guy, and the tracks sounded PHAT. Full bass tones with just the perfect amount of grind. Loved it so much, I went and bought one for gigging. Halfway through my first practice, she temp'd out and shutoff. After a month of this I gave up and sold it. Synopsis: AWESOME recording amp, SUCKY live amp.

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GIVE ME MORE!

Posted by exz5string from Grass Lake, MI on Aug 31, 2009

Experience w/product: I own it

Reviewer's Background: Active musician & recording engineer

Reviewer's Play Style: rock/metal/southern rock/jazz/blues

I love this head, been playing with it for about 5 years now with no issues. What more could you want from a bass head? 900 watts of killer tone! Dual eq is nice for switching styles on the fly. Limiter helps from popping speakers if your not running through a good enough cab. I'm running through David Eden 4x12 dual ported cab with Cort Curbow 5 string bass. Plans to add dual 15" or single 18" cab for a super low end and to take advantage of the built in crossover! Get one, you won't regret it!

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Bummed

Posted by Anonymous Musician on Aug 20, 2009

Experience w/product: I own it

Reviewer's Background: N/A

Reviewer's Play Style: N/A

I just bought an SWR SM-500. It sounds amazing. I thought I had found my ideal amplifier. I rehearsed with it once. The next time I used it at a show, it cut out twenty minutes in to the set due to excessive heat. I was lucky enough to have a back up, but it took about five minutes to reset itself before it would power back on. There is nothing worse that losing power half way in to a song with hundreds of people staring at you. I will sadly be returning it. I loved the sound, but it simply isn't well engineered from a cooling standpoint.

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SWR SM-900 BASS HEAD

Posted by Gonzobassman from Evansville,In. on Feb 28, 2008

Experience w/product: I own it

Reviewer's Background: active working musician

Reviewer's Play Style: all styles

This monster has always been my favorite!I actualy prefered it in full range stereo,as opposed to bi-amped,with a Big Ben 18,and aJr.2-10.I believe you could plug a log into this setup,and still pull an alright tone,but when I plugged my StingRay-5 into it,the whole band got a little weak in the knees!!!My rack took about a 4 foot fall,and I was sure this amp was HIT,but when I took the top off,all that I had to do was resolder the contact points on one capasitor.I really liked the feature where you can set-up two seperate,foot switchable EQs,thats great for switching basses.With all the patching thats possible with this amp it is truly a gearheads dream come true!Bravo SWR!

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Didn't do it for me.

Posted by Stratuspherebass from Detroit, MI on Dec 11, 2007

Experience w/product: I have used it

Reviewer's Background: Active Musician

Reviewer's Play Style: All

I took it home and plugged it into 2 15" speaker cabs from Kustom, played with my Spector and got nothing. Both active and passive. I plugged into my Kustom and got excellent sound. This didn't get loud in the store, but I didn't turn it up. Tone was great, but I'm so disappointed because SWR is so nice.

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SWR SM-900 Bass Amp

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