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Flagship subwoofer delivers rock-solid performance
Klipsch's hard-hitting SW-311 combines advanced technology and thoughtful design to perfectly round out a home theater or stereo music system. A high-output 500-watt amplifier produces room-filling bass power like you wouldn't expect from a sub this compact. The strong-yet-light 10" woofer is designed for quick, precise movement, and teams up with a 10" passive radiator to give you an extra mid-bass boost. And since this sub measures just over a cubic foot, it'll deliver the bass you crave without taking away from your room's décor.

Advanced technology delivers bass that's optimized for your room
Top-mounted controls with an easy-to-read LCD display make it simple to adjust volume, crossover, and more. Klipsch's latest Adaptive Room Correction technology lets you use the included calibration microphone to optimize the SW-311's output for your specific room. You can also select from three preset equalization curves to find just the right amount of "oomph" for your music and movies. And five different presets let you choose the kind of bass performance you need, like "Movie," "Music," or "Night," at the press of a button. Plus, you can adjust the subwoofer's settings to fit your personal tastes, then save them into one of two user-adjustable presets.

An infrared sensor on the front of the SW-311 lets you control its main functions using select learning remotes or control systems. A USB input allows for future upgrades, and gives you access to some of the sub's more advanced filter features. And thanks to a line-level output, you can connect multiple subs to your system and enjoy smoother, more consistent even bass throughout your room.

Product Highlights:

  • Adaptive Room Correction (ARC) II adjusts bass performance for your specific room (includes calibration microphone)
  • Digitally Controlled Subwoofer™ (DCS) user-interface with three EQ modes (flat, depth, and punch) and five user-adjustable presets (music, movie, night, and two assignable settings)
  • top control with 2-line LCD display panel lets you easily fine-tune settings
  • 500-watt RMS BASH® digital hybrid amplifier
  • 10" front-firing woven fiberglass driver
  • 10" side-firing passive radiator
  • four-layer aluminum-wound voice coils for high output
  • frequency response 22-120 Hz (±3dB)
  • variable 40-150 Hz crossover
  • adjustable phase
  • auto on/off
  • line level/LFE (low frequency effects) input and line level output
  • IR sensor for operation with select learning remotes or control systems
  • USB input for future upgrades and access to advanced features
  • compatible with the Klipsch WA-2 wireless audio adapter kit for an easy connection to a sound system
  • 13"W x 13-7/16"H x 16-1/4"D
  • warranty: 2 years
  • Our 60-day money-back guarantee

Why add a powered subwoofer?

A powered subwoofer gives you bass you can feel as well as hear. Our customers love the depth and impact their subs add to music and movies. We hear comments like "it brings out sounds I didn't know existed in discs I've watched a million times." Powered subwoofers aren't just for big bass that rattles your picture frames; they can also deliver tight, accurate lows. If you haven't shopped for a powered sub in a while, you might be surprised at how small they get. Look for an ultra-compact model if you want to tuck your sub away under an end table or in a corner.

Klipsch SW-311 Reviews

Average Customer Review:

1 Review

Excellent Sub for mid size room

Written by: B. Young from Florida on September 24, 2012

Crutchfield Customer Review (What's this?)

I purchased this for my family room system. Room is about 20X15and opens up to a large kitchen. This sub is perfect for this size room. For a large home theater you may need 2.

Pros: Excellent response. Deep, tight bass. Compact size..

Cons: None so far.

Hands-on research

What's in the box?

Download owner's manual

  • Black powered subwoofer
  • 1 Grille (installed)
  • 8' AC power cord
  • ARC-M1 Adaptive room correction microphone (with attached 25' cable terminated by a 3.5mm connector)
  • Owner's manual

Features and Specs

Enclosure Passive Radiator
Video Shielded No
Woofer Size (inches) 10
Woofer Composition Woven fiberglass
Firing Direction Front
Wireless No
Preamp-Level Inputs Yes
Speaker-Level Inputs No
Speaker-Level Outputs No
Low-Pass Crossover Freq 40-150
High-Pass Crossover Freq N/A
Phase Switch Yes
Amplifier Output (watts) 500
Frequency Response 22-120 Hz
Height (inches) 13-7/16
Width (inches) 13
Depth (inches) 16-1/4
Weight 37 lbs
Speaker Parts Warranty 2 Years
Speaker Labor Warranty 2 Years
Amplifier Parts Warranty 2 Years
Amplifier Labor Warranty 2 Years

Product Research



BASH Digital Hybrid Class AB Amplifier: The Klipsch SW-311 powered subwoofer features a highly efficient BASH digital hybrid class AB amplifier which produces reliable, high-powered sound. The built-in amplifier is rated at 500 watts RMS (1200 watts Peak). The RMS power rating indicates power available on a continuous, long-term basis. The Peak power rating indicates power available for large, short-term peaks in your music or movie soundtrack.

Digital Sound Processing: The Klipsch SW-311 utilizes internal digital sound processing for optimum sound at all volume levels.

10" Fiberglass Woofer: The Klipsch SW-311 powered subwoofer features a front-firing highly damped, non-resonant 10" woven fiberglass driver for tight musical bass. The woofer employs a large 4-layer aluminum-wound voice coil for high volume output.

Passive Radiator Design: The Klipsch SW-311 powered subwoofer features a passive radiator design which employs dual side-firing highly damped, non-resonant 10" woven fiberglass passive radiators for greater bass reproduction.

Computer Optimized Surrounds: The SW-311's woofer & passive radiators utilize computer optimized rubber surrounds for tighter bass.

Power LED Indicator: Located on the powered subwoofer's front baffle, this LED indicates the operating status of the unit's built-in amplifier. The LED will light red when the amplifier is in standby mode and green when the amplifier is on and receiving a signal. If the LED is dark and not lit, the amplifier is off.

Rubber Feet: The Klipsch powered subwoofer is equipped with four integrated rubber feet to help prevent against vibration.

Placement: Klipsch powered subwoofers are designed to reproduce deep bass and deliver the impact that makes your movies and music come alive. Typically, optimum performance will result if you place the subwoofer in  a corner of the room on the same wall as your front channel speakers.


Top-Panel Controls: All the subwoofer's controls, and changes to control settings are accessed through the keypad and display on the top of the subwoofer's cabinet. The top-panel display's brightness is adjustable to one of 4 levels.

Note: You can lock the powered sub's keypad and prevent unintentional changes to your settings by other users.

Adaptive Room Correction: The included microphone and integrated Adaptive Room Correction II (ARC) technology optimizes the Klipsch SW-311 for any type of room. The adaptive room correction microphone (ARC-M1) plugs into the subwoofer's rear-panel 3.5mm mic input. The adaptive room correction process is controlled by the subwoofer's top-panel keypad. The unit will measure and analyze your room's acoustics versus the subwoofer's characteristics and apply adaptive room correction to provide optimal bass performance for your specific room environment.

Volume Control: You can use the left/right keys on the top-panel keypad to adjust the subwoofers volume level to match the output of your system's main speakers.

EQ Mode: The Klipsch SW-311 offers three different EQ modes to provide bass emphasis. You can select from Punch, Depth, or Flat. Each is designed to complement different types of audio material, such as movie soundtracks or music. The Punch setting emphasizes the 55Hz region, while the depth setting boosts the 30Hz range. The Flat setting defeats the Punch and Depth setting for a flatter frequency response.

Lowpass Crossover: The Klipsch SW-311 powered subwoofer features a variable lowpass crossover which is adjustable from 40-150Hz. The crossover point chosen determines where low bass frequencies are "handed-off" from your AV system's loudspeakers to the Klipsch powered subwoofer. Set the crossover point based on the size of your systems' main left/right speakers. As a general rule, for larger, floor-standing speakers, set the crossover point between 50-90Hz. If using small bookshelf or satellite speakers for your mains, set the crossover point between 90-150Hz. The smaller the speaker, the higher the setting until the bass frequencies blend well between the loudspeakers and the Klipsch powered sub. If setting the crossover point in the receiver, turn the Lowpass Filter off.

Lowpass Slope: The lowpass slope function is used to adjust how aggressively the subwoofer rejects frequencies above the low pass filter's setting. There are four settings to choose from - 18, 24, 36, and 48 dB/octave. The higher the number the more the upper frequencies are removed from the subwoofer's output.

Phase: The Klipsch SW-311 powered subwoofer has an adjustable phase control which can be set between 0° and 180°. This control is used to acoustically match the subwoofer's output to your system's main speakers. Select a position between 0° and 180°, in which the subwoofer has more output at your main listening position.

Saved Presets: You can store all of the subwoofer's audio control settings (Room Correction, Volume, EQ, Lowpass, Phase) in one of five memory presets - Music, Movie, Night, User 1, and User 2. This way you can save and recall grouped audio settings for different audio content.

Auto On: You can select Auto On or Always On. The Auto-On Circuit turns the amplifier on when an audio signal is detected and off after approximately 20 minutes with no input signal.

IR Sensor: An infrared remote control sensor is included on the front of the subwoofer for integration with A/V remote control systems. The IR codes for this subwoofer can be obtained by visiting the Klipsch website.

Note: A dedicated remote control does not exist for this unit.


Line-Level Input: The Klipsch SW-311 powered subwoofer is equipped with a pair of line-level RCA-type inputs. Most of today's AV receivers have a line-level subwoofer output (LFE) labeled Subwoofer Pre Out, Sub Out, or SW Out. If your receiver has this output, connect on end of a subwoofer cable to it and connect the other end of the cable into the powered subwoofer's line-level input labeled "LEFT/LFE". This connection allows the subwoofer to operate with both music and surround sound movies. In absence of a subwoofer (LFE) output on your receiver, as an alternative hookup, you can connect Left & Right channel pre-amp outputs from a receiver to the "Left/LFE" and "Right" input on the powered subwoofer.

Line-Level Output: The SW-311's mono line-level (RCA-type) output can be used as an alternate method of connecting a second powered subwoofer in  your home theater system. The signal output from this mono RCA jack is effected by the Volume, EQ, Lowpass, Phase, and Room Correction settings of this subwoofer. The advantage of this, is the ability for the Klipsch SW-311's Adaptive Room Correction function to correct the response of the second subwoofer, resulting in a more accurate response.

USB (type-B): This computer interface allows access to additional advanced features within the subwoofer's room correction software. Optional, proprietary Klipsch software and a higher level of technical knowledge are required to correctly utilize this capability. This port can also function as an alternative control interface with A/V control systems that can utilize a USB hookup.

12-Volt Trigger: The SW-311 features a 12-volt trigger input (3.5mm) which turns on the powered subwoofer when a 12-volt trigger signal from a connected receiver is detected.

WA Port (optional): The Klipsch powered subwoofer is fitted with a proprietary 4-pin "WA-Port" connector for wireless operation, using Klipsch's optional WA-2 wireless subwoofer kit (714WA2, sold separately). The Klipsch WA-2 wireless subwoofer kit consists of two components; a wireless Transmitter & wireless Receiver. The WA-2 wireless subwoofer kit makes adding the Klipsch powered subwoofer to your home theater system much easier, because it replaces the need for a separate subwoofer cable that traditionally must be connected between the receiver and the powered sub. Now, you can easily place your powered subwoofer where it both sounds and looks best in the room since you're not restricted by an audio cable.

Our Product Research Team

At Crutchfield, you'll get detailed, accurate information that's hard to find elsewhere. That's because we have our own in-house Product Research team. They verify what’s in the box, check the owner's manual, and record dimensions, features and specs. We stay on top of new products and technologies to help people make informed choices.