SVS SB4000 Subwoofer

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The new SVS SB4000 Subwoofer will surpass any preconceptions you may have had about subwoofer performance. Filling any room with deep bass and astounding energy, this subwoofer uses trickle-down technology from the SVS 16-Ultra series in order to remain consistent across the entire range. A free-to-download control app will also make operation so much easier.

The new SVS SB4000 Subwoofer will take any preconceptions of subwoofer performance to entirely new levels, taking command of any room in which it is place thanks to the trickle-down technology that has been integrated throughout the 16-Ultra Series in order to maintain a consistent performance across the entire range. This subwoofer will far surpass any expectations, filling the room with deep and effortless bass, and adding an unprecedented visceral energy to whatever you are listening to, no matter whether that be a film soundtrack or your favourite album.

High Excursion SVS Subwoofer Driver

The SVS SB4000’s subwoofer driver will utilise the full potential of the Sledge STA-1200D amplifier, offering immense power and precision with enough control to produce SPL and achieve low frequency extension precisely over all drive levels. The dual ferrite magnet motor assembly within this subwoofer weighs a mere 40lbs and generates an immense magnetic force, and the excursion of the 13.5” will allow the SB4000 to produce a mammoth low frequency output – so low that it is below the limits of human hearing. An edge wound voice coil with eight-layer aluminium flat wire works to minimise distortion and compression, all the while ensuring excellent heat dissipation and linearity to achieve precise control through the subwoofer. Within this subwoofer, a lightweight and rigid composite cone can be found. This cone uses a premium glass fibre dust cap in order to generate a massive output with pinpoint accuracy throughout the frequency response.

Sledge Amplifier and Fully Discrete MOSFETs

The SVS SB4000 incorporates the Sledge STA-1200D amplifier, a Class-D amplifier that has been rated at 1200 watts RMS with 4000+ watts peak power. Combined with the fully discrete MOSFET output and a sophisticated Analog Devices DSP engine, this amplifier will produce effortless power and advanced processing at an unprecedented level that is not available from any other powered subwoofer currently on the market. The efficiency of a Class-D amplifier with the ability to move large quantities of current through the discrete MOSFETs will allow an extremely large output and enable precise control for this subwoofer no matter what drive level it is operating at.

Variable Port Tuning Modes

Foam port plugs allow for variable tuning, with each response curve over the three port tuning modes (standard, extended, sealed) fully configured to each mode respectively in order to achieve balanced and accurate low frequency response over all tuning preferences.

Active Power Factor Correction and Ground Loop Isolation

The SVS SB4000 Subwoofer features active power factor correction to deal with wide fluctuations in voltage, serving as a line conditioner, surge suppressor and voltage regulator. This PFC will make sure that the subwoofer itself is operating perfectly on any household circuit regardless of how unstable an incoming current is. The isolated circuit will create a low noise floor through elimination of potential ground loop hums emitted from outside components, thus resulting in sonic transparency that is as best as it could possibly be.

Acoustically Inert Sealed Box Cabinet Design

When it comes to its design, the SVS SB4000 Subwoofer features an inlaid front panel display, rounded edges, and a curved metal grille on the cabinet. These design characteristics will ensure it remains elegant in its aesthetics, allowing it to fit seamlessly within any existing home hi-fi / home cinema system setup.

A double thick, two inch MDF cabinet walls and rigid internal bracing support the drive unit and ensure an acoustically inert environment. The sealed cabinet design, highly reinforced internal components, and acoustic insulation then works to eliminate any and all colouration or resonance from the cabinet; even when the deepest of low frequencies are played at reference volume. To top it off, a protective, non-resonant steel-mesh grille and custom elastomer feet are included to reduce noise artefacts within a room, whilst a 2-way feedback will display updates in real time on both the app and the subwoofer’s own interface.

SVS SB4000 Control App

This convenient little app will make control and management of the SVS SB4000 Subwoofer that much easier, with connection achievable via Bluetooth technology, this app will allow you to control the subwoofer even when the unit is out of sight. This app features 3-band parametric control capabilities, allowing you to make precise and accurate adjustments to frequency slope and Q factor, all the way down to the single Hz level, with four different slopes. This means that users are able to improve the SB4000’s performance through the elimination of peaks, nulls and other room issues.

The control app allows you to store 3 different presets for movies, music and more. And 2-way feedback shows updates in real time on the app and the subwoofer’s interface. The App can be found and downloaded for free via the Apple iOS AppStore for iPhones and iPod devices, and via Google Play Store for Android devices.

  • Active Power Factor Correction and Ground Loop Isolation
  • Sledge Amplifier and Fully Discrete MOSFETs
  • Acoustically Inert Ported Box Cabinet Design
  • High Excursion SVS Subwoofer Driver
  • Variable Port Tuning Modes
  • SVS SB4000 Control App
More Information
Product Specifications

Subwoofer Specs


Premium Black Ash and Piano Gloss Black finish options


Protective non-resonant steel mesh grille


Front-firing 13.5" driver


Rear-mounted amplifier


Screw-in rubber feet


Robust Medium Density Fiberboard(MDF) cabinet construction


Cabinet Dimensions (without grille): 18.3” (465mm) H X 17.8” (453mm) W X 18.6” (471.3mm) D


Cabinet Dimensions (with grille): 18.3” (465mm) H X 17.8” (453mm) W X 20.9” (530mm) D


Shipped Dimensions: 23.5” (598mm) H X 23.5” (598mm) W X 28” (712mm) D


Weight (unboxed): 102.3 lbs. (46.4 kg)


Shipped Weight: 117.8lbs (53.45kg)



Driver Specs



High-performance SVS 4000 Series Subwoofer Driver - optimized for sealed cabinet design


Proprietary 13.5” Driver with finely tuned Overhung Motor Configuration


43lb (19.5kg) pound Woofer with 37.7lb (17.1kg) pounds for the motor


Overhung 52mm Xmax, 76.2mm Xmech precision aligned excursion


8-layer aluminum flat wire edge wound 3” voice coil for ultra-low distortion, efficient heat dissipation, exceptional linearity and nearly zero power compression


Two massive, dedicated toroidal ferrite magnets generate unparalleled levels of magnetic force to drive the highest levels of excursion, SPL, and start/go power for the deepest and most authoritative bass possible


All-new High density FEA-optimized cast aluminum basket provides unequaled levels of rigidity, tensile strength, and energy transference available from a subwoofer


Dual 24-strand copper and Nomex composite high-temperature leads woven through the suspension provide a pristine electrical connection from the amplifier to the voice coil


Premium glass fiber laminated dustcap and reinforced and vented paper-composite cone sub-structure ensure a light, ridged, and neutral radiating surface


Precision machined motor elements and narrow tolerance suspension parts produce unmatched linearity at full excursion for exceptionally tight and fast output, even at reference volumes


Extreme oversized low carbon vented steel U-yoke and top plate provide superior cooling and improved magnetics for maximum performance and efficiency


Copper ring shorting sleeve reduces gap induction and distortion, enhances thermal conductivity


Nickle-plated high-tension spring terminals


Proprietary injection molded gasket and parabolic SBR extreme-excursion surround maintains ideal pistonic motion for pinpoint accuracy and control


Low carbon 1008 steel components with black electrophoresis plating



Amplifier Specs



Massively powerful Sledge 1,200-watt continuous Class D design with 4,000+ watts of Peak Power


Unmatched intelligence from user adjustable low pass, phase, polarity and room gain compensation with three parametric EQs and port tuning (Ported models only) for absolute best alignment with speakers and optimized performance in any room


Groundbreaking SVS Bluetooth DSP control app for iOS and Android devices with three user presets allow custom tuning for every room and system


High efficiency cool-running Class D switching topology with massive 32 Amp 600 Volt MOSFET’s result in lower EMI and highest efficiency while providing effortless power to produce SPLs and low frequency output with pristine clarity well beyond reference listening levels


High resolution 50Mhz Analog Devices Audio DSP with double precision 56bit filtering is most advanced subwoofer processor available for perfect audio reproduction


100v-240v full range input active Power Factor Correction (PFC) pre-regulates mains to solid 360V DC regardless of mains voltage or quality so the sound quality never falters no matter what’s coming out of the wall


Active PFC lowers average current and smooths mains input current allowing for 1200W output from a standard 15A mains circuit


XLR and RCA stereo input/output with ultra-wide input voltage for consumer and professional audio applications


Convenient front-mounted display featuring new Intelligent Feature Control (IFC) with bright blue dimmable/defeatable 8-digit LED front display


Custom EQ and DSP limiter settings tuned specifically for the SB-4000 sealed cabinet design


Auto/On and 3-30V AC/DC trigger for Maximum Installation Convenience


Input impedance 22kohm (unbalanced RCA)/ 22kohm (balanced XLR)


Green 0.5-watt low standby power consumption


RoHS compliant, lead-free construction, world-wide safety certifications


Convenient front-mounted display featuring new Intelligent Feature Control (IFC) with bright blue dimmable/defeatable 8-digit LED front display


Custom EQ and DSP limiter settings tuned specifically for the PC-4000 cylinder cabinet design. Auto/On and 3-30V AC/DC trigger for Maximum Installation Convenience


Input impedance 22kohm (unbalanced RCA)/ 22kohm (balanced XLR)


Green 0.5-watt low standby power consumption


RoHS compliant, lead-free construction, world-wide safety certifications



SVS App Specs



The most powerful and flexible Bluetooth controlled subwoofer DSP app, works with both iOS and Android operating systems


Easiest and most convenient way to adjust crossover frequencies, parametric EQ, polarity, room gain and all other bass management functions


Three convenient custom presets allow for perfect tuning in any room or system, from your favorite seat


Single tap adjustment for controlling variable port tuning with standard, extended and sealed modes


Unique bidirectional feedback shows adjustments in real time on both app and subwoofer interface


Easy-to-follow tutorial provides clear guidance for all functions



Included Accessories



Protective non-resonant steel mesh grill


IR remote control


Elastomer feet included


Extra heavy-duty, high current 6' power cord


SB-4000 Subwoofer Manual


Quick Start Guide



Your Delivery:

Orders received before 1:00 pm* will be despatched the same day and can be delivered for next working day, (except bank holidays).  For you convenience you can choose multiple shipping options on the checkout page. We will also email with your tracking and dispatch information.

30 Day Returns Policy

HiFix is committed to selling quality products which we hope you will love, we do understand, however, that there maybe a time when you need to exchange or return something you have bought. We really do hope you are pleased with your purchase but should you wish to return anything bought from us, we will be happy to refund or exchange a product within 30 days.

NameSKUQtyLead time
SVS SB4000 Subwoofer Black Oak442451In Stock for Immediate Dispatch
SVS SB4000 Subwoofer Gloss Black442461In Stock for Immediate Dispatch

Warranty information for SVS:

Image result for SVS audio logo

SVS products are designed and manufactured to the highest quality standards. However, if something does go wrong with the product we are here to help. From your date of purchase your product is warranted against faulty materials or workmanship for a period of 60 months.

This guarantee applies to all SVS Products including Sub Woofers. Providing you with peace of mind and the assurance of premium Quality.

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