• 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 factory warranty
• Professional, modern, classy, sleek - all pointing to "pristine," which is a hallmark of the SWR sound

• 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 ß" and two Speakon® speaker output jacks