SWR SM-900 Bass Amp  

Product #482000

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This product has been discontinued but may be available as a Open Box 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 (<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.

 

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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Reviewed by 1 customer

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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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