SVS SB-4000 Subwoofer


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The SB-4000’s sophisticated DSP amplifier, innovative driver and a sealed box design command a space with deeper bass and higher output levels than what is typically possible from a subwoofer of its size.


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Chest-thumping slam and extreme low frequency extension with pinpoint accuracy and refined musicality – a level of subwoofer performance not seen at this price before. The SB-4000’s sophisticated DSP amplifier, innovative driver and a sealed box design command a space with deeper bass and higher output levels than what is typically possible from a subwoofer of its size. A top choice for audiophile music or home theater systems, the SB-4000 leaves larger and more expensive subs trembling in its wake.

SVS SB-4000 Subwoofer Review


The SVS SB-4000 Subwoofer is a powerful and versatile addition to any home theater or audio system. With its compact design and advanced features, it aims to deliver deep, impactful bass without drawing attention to itself. In this review, we will examine its design, performance, control options, and value for money to help you make an informed decision.

Design and Build Quality

The SVS SB-4000 Subwoofer features a solid and robust build quality. It measures 18.3 inches (H) x 17.8 inches (W) x 18.6 inches (D) and weighs 102.3 pounds, making it a substantial and well-constructed unit. The subwoofer is available in two finishes: Premium Black Ash or Piano Gloss Black, allowing you to choose the option that best suits your aesthetic preferences.

One notable design feature is the front-facing woofer, which is protected by a curved, steel mesh grill. This grill not only adds a touch of elegance to the overall design but also provides protection to the driver. The build quality of the subwoofer is exceptional, ensuring durability and longevity.


The SVS SB-4000 Subwoofer delivers outstanding performance, thanks to its impressive specifications. It boasts a frequency response of 19Hz to 310Hz ±3dB, allowing it to reproduce deep and accurate bass frequencies. The 13.5-inch driver size further enhances the subwoofer's ability to deliver powerful and detailed low-end performance.

The subwoofer is powered by the Sledge STA-1200D Class D amplifier, which provides 1,200 watts RMS and over 4,000 watts peak power. This amplifier ensures that the subwoofer can handle demanding audio content with ease, delivering clean and distortion-free bass even at high volumes.

When it comes to low-frequency performance, the SB-4000 excels. It produces tight, deep bass that blends seamlessly with the main speakers, providing a full-range sound experience. The subwoofer's ability to reproduce sub-sonic sounds below 20 Hz is particularly impressive, adding an extra dimension to your audio content.

Whether you are listening to music or watching movies, the SB-4000 Subwoofer delivers exceptional performance. It accurately reproduces the nuances of musical instruments and enhances the soundstage, providing an immersive listening experience.

Control and Adjustability

The SVS SB-4000 Subwoofer offers a range of control options, allowing you to fine-tune its performance to suit your preferences. The subwoofer can be easily adjusted using the SVS app, which provides precise control over various parameters. With the app, you can adjust the phase, equalizer settings, and other DSP functions to optimize the subwoofer's performance.

In addition to the app, the subwoofer also features manual phase adjustment and a three-band parametric equalizer, allowing for easy customization. These controls enable you to tailor the subwoofer's output to match your room's acoustics and personal listening preferences.

The SB-4000 Subwoofer's DSP functions further enhance its adjustability. These functions allow for precise sound customization, ensuring that the subwoofer's performance is optimized for your specific audio setup.

Comparison with Ported PB-4000

One point of comparison is the SVS SB-4000 Subwoofer's sibling, the PB-4000, which features a ported design. While the SB-4000 is a sealed box subwoofer, the PB-4000 offers a bass reflex design. The main difference between the two lies in their low-frequency output and the perceived grandiosity of the lower bass.

In terms of output, the ported PB-4000 outperforms the SB-4000, especially below 50Hz. The ported design allows for greater air movement, resulting in more impactful bass, particularly in larger rooms. However, the SB-4000 still offers exceptional low-frequency performance, going well below 20 Hz.

The choice between the SB-4000 and the PB-4000 depends on your specific needs and room characteristics. If you have a smaller room or prefer a more compact subwoofer, the SB-4000's sealed box design may be the better option. On the other hand, if you have a larger room and prioritize maximum bass impact, the PB-4000's ported design may be more suitable.

User Experience

The SVS SB-4000 Subwoofer offers a user-friendly experience from setup to daily use. The subwoofer is easy to set up and calibrate, and the SVS app provides a convenient way to control and adjust its settings. The app's intuitive interface allows for precise adjustments, making it simple to achieve the desired sound.

In terms of control options, the SB-4000 Subwoofer offers both a front display panel and four directional arrow buttons for manual control. These physical controls provide quick and easy access to basic functions without relying on the app.

The subwoofer's compact size and sturdy build make it easy to place in various rooms. Its footprint is smaller compared to its ported sibling, the PB-4000, making it more versatile in terms of placement options.

However, it is worth noting that the piano gloss black finish may require regular dusting to maintain its appearance. If you prefer a low-maintenance option, the premium black ash finish may be a better choice.

Value for Money

Considering its performance and features, the SVS SB-4000 Subwoofer offers excellent value for money. With a price tag of $1,499 for the Premium Black Ash finish and $1,599 for the Piano Gloss Black finish, the subwoofer provides a high level of performance and refinement relative to its price range.

While there are some competitors that offer similar performance, they often come with a higher price tag. The SB-4000 Subwoofer's combination of power, accuracy, and adjustability at its price point makes it a compelling option for those seeking top-notch bass performance.

It is also worth mentioning that the SVS brand has a strong reputation in the industry, and the SB-4000 Subwoofer holds its value well. Its demand on the resale market is often high, providing a potential advantage for those looking to upgrade or sell down the line.


The SVS SB-4000 Subwoofer is a reference-grade subwoofer that delivers exceptional low-frequency performance and precise bass reproduction. Its solid build quality, compact size, and range of control options make it a versatile choice for various audio setups.

While the lack of an automated equalization system may be a drawback for some, the subwoofer's manual adjustment options, including the three-band parametric equalizer, provide ample room for customization. Additionally, the choice between the SB-4000 and the PB-4000 will depend on your specific needs and preferences.

Overall, the SVS SB-4000 Subwoofer offers outstanding performance, build quality, and value for its price range. Whether you are a music enthusiast or a movie lover, this subwoofer is capable of delivering the deep, impactful bass that enhances your listening experience.


  • Front Firing long-stroke 13.5” driver
  • STA-1200D Sledge, 1,200 watt (4,200 watts peak) amplifier
  • Premium Black Ash or Piano Gloss Black Finish
  • Protective, Non-Resonant Steel Mesh Grille
  • Rigid and Braced MDF Cabinet
  • 19-310Hz +/- 3 dB
  • Dims (w/ grill): 18.3” H X 17.8” W X 20.9” D
  • Weight: 102.3 lbs.

Additional Info

Unparalleled Low Frequency Depth, Power and Detail

The SVS SB-4000 powered subwoofer demolishes all preconceived notions about subwoofer performance and technology by taking command of any room with deep, effortless bass and adding visceral energy to every listening experience. With trickle down technology from the 16-Ultra Series, named top subwoofers in the world by nearly every audio publication and industry group in 2017, the SB-4000 obliterates expectations and delivers a level of unrivaled subwoofer performance only available from SVS.

High-Excursion SVS Driver – Legendary SVS Output and Control

The SB-4000 subwoofer delivers on the full potential of the Sledge STA-1200D amplifier’s power with precision and control to produce room energizing SPLs and effortless low frequency extension with pinpoint accuracy at all drive levels.

  • Dual ferrite magnet motor assembly weighing nearly 40lbs generates immense magnetic force and excursion of the 13.5-inch driver to produce massive low frequency output well below the limits of human hearing.
  • Edge wound voice coil with eight-layer aluminum flat wire minimizes distortion and power compression while providing excellent heat dissipation and linearity ensuring precise control.
  • Lightweight and rigid composite cone with premium glass fiber dustcap generate massive output with pinpoint accurate frequency response.
  • Proprietary injection molded gasket and long-throw parabolic surround ensure longevity and allow extreme excursion and SPLs.

Sledge Amplifier – Massive Output, Sophisticated DSP, Advanced Power Management

Rated conservatively at 1,200 watts RMS, and 4,000+ watts peak power, the SB-4000 Sledge STA-1200D amplifier uses an efficient Class D design combined with fully discrete MOSFET output and a sophisticated Analog Devices DSP engine. The result is a level of effortless power and advanced processing not available from any other powered subwoofer manufacturer.

High Current Output of Fully Discrete MOSFETs with Efficiency of Class D Amplifier

Efficiency of a Class D amplifier with the ability to move massive amounts of current through the fully discrete MOSFETs enabling immense output and precise control for outstanding real-world subwoofer performance at all drive levels.

Sophisticated 50MHz High Resolution Analog Devices Audio DSP

Most advanced digital processor ever used in a subwoofer maintains pinpoint accuracy and pristine sound quality through advanced in-room tuning, optimized frequency response curves, powerful DSP controls and more.

Active Power Factor Correction (PFC) & Ground Loop Isolation

Serves as a line conditioner, surge suppressor and voltage regulator letting the amplifier deal with wide voltage fluctuations and ensuring the subwoofers operate flawlessly on any household circuit no matter how unstable the incoming current. An isolated circuit creates a vanishingly low noise floor by eliminating the potential for ground loop hums from outside components resulting in absolute sonic transparency.

SB-4000 Smartphone App – Easiest Way Ever to Manage Subwoofer DSP and Control

Groundbreaking smartphone app works with Apple iOS® and Android® devices to unleash the full depth, force and nuance of the SB-4000 powered subwoofer by controlling all DSP functions including: volume, parametric EQ, low pass filter, phase, polarity, room gain, port tuning, custom presets and system settings.

  • Connects via Bluetooth for convenient control even when subwoofer is out of sight.
  • 3-band parametric EQ controller allows precise adjustments for frequency slope and Q factor down to the single Hz level with four different slopes, so users can improve performance by eliminating peaks, nulls and other room issues.
  • Stores 3 custom presets for movies, music and other listening experiences such as sports or gaming.
  • 2-way feedback shows updates in real time on both the app and subwoofer interface