Loaded with the same exact feature set as the trendsetting WorkingPro 700, the WorkingPro 400’s 400 watts go a lot further thanks to our exclusive Bass Intensifier circuit. It takes frequencies from 20 Hz up to a selectable frequency between 80 Hz and 200 Hz, then boosts and compresses them at the same time for optimum impact on the overall low end. The result is a thicker, fatter, faster bass response – perfect for thickening up that bridge-pickup “Jaco” sound, or just dropping a sub bomb on the audience whenever you feel the need.

Features:

400 watts @ 4 ohms, classic SWR preamp with Aural Enhancer, Bass Intensifier circuit, four-band Active EQ with variable midrange, tuner send with tuning mute switch, studio-quality XLR out with ground lift and level pad, automatic limiter with defeat option, effects loop with blend control, stereo headphones out, dual Speakon and 1/4” speaker outputs, two-button footswitch included (Bass Intensifier/tuning mute)

19” W x 3.5” H x 13.5” D, 25 lbs 

Specifications:

Model Name	WorkingPro™ 400
Series	WorkingPro™ Series
Type	Solid State Bass Amplifier Head
Description	-The WorkingPro 400 is a 400-watt, all solid-state rackmountable professional bass amplifier. -The classic, timeless, crystal-clear tone of the famous SWR® preamp and Aural Enhancer™. -The new Bass Intensifier™, an instant low-end frequency boost combined with fast-acting compression that literally intensifies the bass response - and makes a 400-watt amplifier sound like an 800-watt amplifier. -It breaks away from the trend of low-to-midline bass amplifiers that come pre-installed in a "head case" - instead, the WorkingPro amplifiers are two-rack-space rackmountable pieces. -It provides road-tested and studio-proven professional tone at a power-to-price ratio unmatched in the industry. -It comes with a two-button footswitch for hands-free control of the Mute (allows for silent tuning and practicing) and Bass Intensifier controls -5-year transferable warranty -Professional, modern, classy, sleek - all pointing to "pristine," which is a hallmark of the SWR sound
Features	Front panel controls & features: *Input jack w/-10db pad option *Mute switch (mutes all outputs except tuner out and headphones out jacks) *Independent preamp gain and master volume controls *Exclusive SWR Aural Enhancer™ tone-shaping control *4-band active EQ with variable midrange *Bass Intensifier Level and Frequency Cutoff controls *EFX Blend control for side-chain effects loop *Automatic limiter with defeat option Rear panel controls & features: *Studio-quality XLR Balanced Output w/pre- or post-EQ option *XLR ground lift and output level pad (-10db) switches *Side-chain effects loop (effects send & return jacks) *Tuner Out jack *Unbalanced Line Out jack (post-effects-loop line-level out) *Headphones Out jack - for silent practicing when used with Tuning *Footswitch jack (for two-button footswitch that activates Mute and Bass intensifier circuit, included with purchase) *Two ¼" and two Speakon® speaker output jacks
Power Output	400 Watts @ 4 ohms 250 Watts @ 8 ohms
Impedance (Ohms)	N/A
Speakers	N/A
Channels	1 Channel preamp, mono block poweramp
Controls	Mute Switch, Gain with Preamp Clip Indicator, Aural Enhancer, Bass Intensifier: Engage Switch Level, Cutoff, Limiter Defeat Switch, Input Pad, Gain, Aural Enhancer, Bass, Mid Level, Mid Frequency, Bass, Treble, Transparency, Effects Blend, Master volume
Covering	Polished aluminum
Weight	25 lbs.
Dimensions	Height: 3.5" Width: 19" Depth: 13.5" (2 rack spaces)
Power Handling	N/A
Tube Complement	N/A
Accessories	Includes 2-Button footswitch for activating Mute and Bass Intensifier Circuit, P/N 0065436000
Cover	N/A
Footswitch	Includes 2-Button footswitch for activating Mute and Bass Intensifier Circuit, P/N 0065436000, US MSRP $49.99
Frequency Response	(Power Amplifier) (@ 850 watts RMS) -3dB @ 20 Hz and 40 kHz
SPL	N/A
Suggested Speaker Enclosures	SWR WorkingPro 4x10 SWR Goliath III™ 4x10 (1) SWR WorkingPro 4x10 & (1) SWR WorkingPro 1x15 (1) SWR Goliath III 4x10 & (1) SWR Son Of Bertha™ 1x15 (1) SWR WorkingPro 4x10 & (1) SWR WorkingPro 2x10 (1) SWR Goliath III 4x10 & (1) SWR Goliath Junior III™ 2x10 (8 ohms)
Suggested Speaker Combinations	N/A
Input Impedance	N/A
Output Impedance	N/A
Sensitivity	N/A
Signal to Noise Ratio	N/A
Introduced	7/2005
Notice	Product Prices, Features, Specifications and Availability Are Subject To Change Without Notice