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SWR SM-900™

Tube Pre-Amp 900-watt Bass Head

Product Code: 3252

Authorized SWR Dealer
We're sorry, this product is no longer available.

Description
The SM-900 has been one of the most requested bass amplifiers for concert stages and studios worldwide since its introduction in 1991 - and it continues to be the benchmark by which other bass amplification systems are judged. The 900 combines the sweet, warm SWR tube preamp tone with two power modules for the option of 900 watts in bridged mode (400 per side in stereo). The dual three-band semi-parametric EQs can be can be combined into a single six-band configuration - offering more tonal control than is available in many professional quality studio consoles. Add the extensive patching options on the back of the amp and you have a perfect tool for the working bassist. It’s no surprise that this workhorse continues to set the standard for bass amplifiers!
In Depth
- Series: Classic Series
- Type: Mono/Stereo Bass Amplifier Head
- Description: 900 watt, feature packed, powerhouse amplifier. Rack mountable with foot switchable EQ section. Can be run mono, stereo or bi-amped.

FRONT PANEL FEATURES:
- 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
- Our 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
- Rack mountable.
- Bi Amp Crossover Point Control: 100 Hz to 1000 Hz
- Crossover Slope: 12 dB per octave
- Rack Handles

REAR PANEL FEATURES:
- 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:
- Two 1/4" jacks each for Left and Right Stereo Out
- One Speakon® speaker output 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 FEATURES:
- (1) 12AX7 Preamp Tube
- Cooling fan

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)

- Impedance (Ohms): N/A
- Speakers: N/A
- Channels: 1 Channel with dual switchable EQ banks

Controls:
- Gain with preamp clip indicator
- 3-Position EQ selector switch
- Aural Enhancer
- Bass

EQ 1:
- 3-Band Semi-Parametric EQ

EQ 2:
- 3-Band Semi-Parametric EQ

- Crossover Frequency
- Balance
- Limiter
- Treble
- Effects Blend
- Master volume

- Covering: Black steel chassis
- Weight: 35 lbs. (15.9 kg)

Dimensions:
- Height: 3.5" (8.9 cm)
- Width: 19" (48.3 cm)
- Depth: 13.75" (34.9 cm)
- (2 rack spaces)

- Power Handling: N/A
- Tube Complement: (1) 12AX7 Preamp Tube
- Accessories: Includes 1-Button Footswitch
- Cover: N/A
- Footswitch: Includes 1-Button Footswitch
- Frequency Response: (Power amplifier): -3dB @ 20Hz and 40KHz
- SPL: N/A

Suggested Speaker Enclosures:
- Megoliath™
- Goliath Senior™
- Big Bertha™
- Goliath III™

Suggested Speaker Combinations:
- (2) Goliath III
- (2) Son Of Bertha™
- (1) Goliath III & (1) Son Of Bertha
- (1) Goliath III & (1) Big Ben™

- Input Impedance: Passive/Active Input: 800K Ohms
- Active Input: 60K Ohms
- Effects Return: 27K Ohms

Output Impedance:
- Effects Send: 100 Ohms
- Tuner Send: 100 Ohms
- XLR:1.5K Ohms
- Crossover High and Low Outs: 100 Ohms

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

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

Item Number: SWR SM-900™ [4400100010]    3252 0-0
View all SWR products
View all SWR products


SWR SM-900™ [4400100010]


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