The power and features required by today's gigging bassist.

The rackmountable, 2U SWR WorkingPro 400 Bass Amplifier head delivers 400W @ 4 ohms. For tone shaping it combines a 4-band EQ with variable mids, SWR's Aural Enhancer circuitry, and a Bass Intensifier that boosts and compresses the lows. Other pro features include preamp gain and master controls, automatic limiter with defeat switch, blend control for sidechain effects, XLR balanced pre/post output, and footswitch for Intensifier and mute.

SWR WorkingPro 400 Bass Amplifier Features:

• 400W @ 4 ohms; 250W @ 8 ohms
• -10dB pad option on input
• Mute switch (footswitchable)
• Independent preamp gain and master volume controls
• Exclusive SWR Aural Enhancer tone control
• 4-band active EQ with variable midrange
• Bass Intensifier with level and frequency cutoff controls (footswitchable)
• Automatic limiter with defeat option
• XLR balanced output with pre/post switch, ground lift and -10dB switch
• Side-chain effects loop with blend control
• Tuner out jack
• Unbalanced line out jack
• Headphone jack
• Footswitch jack for included 2-button switch (switches Intensifier and mute)
• 2 - 1/4" and 2 Speakon speaker jacks
• 5-year transferable warranty

Step up to SWR. Order today.

SWR WorkingPro 400 Bass Amplifier Specifications:

• 400W @ 4 ohms; 250W @ 8 ohms
• 19"W x 3-1/2"H x 13-1/2"D
• 25 lbs.

SWR WorkingPro 400 Bass Amplifier

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Average of 11 User Ratings

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Customer Reviews

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Not pleased

Posted by Mizzy from Boulder on Dec 14, 2009

Experience w/product: I own it

Reviewer's Background: Active Musician 20 yrs

Reviewer's Play Style: Funk, Rock, Gospel.

I think this amp is nice and loud, but the tone leaves something to be desired. I went from a trace elliot head that fried and went to this. I cannot get anywhere near the warm tone of a Trace or Ampeg. This is going on ebay soon. This is not horrible, just doesn't have the wow factor. Spend the extra cash if you can, and go with something else.

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Good stuff

Posted by thatGuy from Greensboro, NC on Aug 27, 2008

Experience w/product: I own it

Reviewer's Background: Active Musician, Weekend Warrior

Reviewer's Play Style: Rock, Funk, Country

This head unit may not have as many knobs as other heads, but the raw tone is undeniable. I have owned this head for close to a year now and the only negative thing I have to say about it is that for large stage applications it will be under powered. Easily fixable by purchasing the 700 model. Good Job SWR :)

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Intensifier Please!

Posted by MagdaMatt from Colorado on Jan 16, 2008

Experience w/product: I have heard about it

Reviewer's Background: Active Musician Bassist for Magda

Reviewer's Play Style: Cold Metal Dredge

I recently switched from and old Earth Research head and fender 2x15 to this head with a 4x10 and a 1x15. Things fall off shelves, my guitarist now wears earplugs when we practice. Love it, sounds great looks great. I play 5 string fretless and it growls!Might have done well to get the 700 head, but this works very well for the venues we play. Turning off the intensifier makes it sort of tinny sounding, however, crank up the gain a notch and the sound is back.

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SWR WorkingPro 400 is AMAZING!!!

Posted by Mikeyd74 from Illinois on Dec 24, 2007

Experience w/product: I own it

Reviewer's Background: Active Musician

Reviewer's Play Style: Rock, Metal, Alternative

I put the SWR through my Ampeg SVT-410 HLF(4ohm)cabinet and I get a clean although slightly-growly low end thunder. This is the sound I have always been looking for. I have used this amp and head combination on stage for a year now and I have had nothing but great performance everytime. The features are amazing as well. The "Bass Intensifier" delivers gobs of low end without distorting and the "Aural Enhancer" acts more like a "room tuner." You can always cut through the mix. Plenty of power too.

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Monster Sound!!!

Posted by Anonymous Musician from Lynchburg, Virginia on Sep 18, 2007

Experience w/product: I own it

Reviewer's Background: 52 year old Active Musician with 44 years experien

Reviewer's Play Style: R & B, FUNK, Jazz, Pop, & Rock

I paired this with one of my Ampeg 410 400 Watt 4 ohm Cabinets and the guys on the band all fell in love with the sound. The Aural Enhancer and the BASS INTENSIFIER are outstanding. All my other amps heads and amps are ampeg. Now I am convinced the SWR is a great choice. I recommend that you try one at your local music store and see what you think.

The Buckster

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SWR WorkingPro 400 Bass Amplifier

Read 11 Reviews

SWR WorkingPro 400 Bass Amplifier

Read 10 Reviews