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Kraken Quad 21″ Powered Subwoofer

Scary Deep, Powerful, Unrelenting

The Legendary Monster of the Deep


  • Intense SPL to 25Hz
  • Massive Output
  • Tiny Footprint

The Quad 21″ Kraken Powered Subwoofer is designed for large scale festival touring systems; high-intensity nightclubs; art cars/festival floats; and BASS junkies who need the most body + face melting bass they can get. The Kraken will eat you alive!

More Info  |  Specs

Kraken Quad 21″ Powered Subwoofer

Get Krak’ed


The Kraken embrace is crushing & inescapable.
You’ll love every minute of it.

The most extreme bass output we can pack into the smallest footprint. The Kraken offers the highest SPL on the market from a cabinet of its size, bar none. The output of 4-5 BASSBOSS double 18” subs has been packed into a cabinet roughly the size of just two.

The Kraken embrace is a monstrously beautiful thing. Capable of almost brutal force, it hits so good. Just like the VS21 Single 21″ Powered Subwoofer, excellent transient response is delivered by the efficient performance of short horns at the upper end of the subwoofer range. The extended depth is delivered by the large, vented volume, long excursion drivers, and prodigious power.

Don’t hold back!

BASSBOSS subs are optimized for full-power usage.

Multiple proprietary protection technologies ensure that the woofers remain within their excursion and thermal limits, so they don’t break or burn like other subs. BASSBOSS provides much higher levels of deep bass than mass-market subs, reliably.

With plenty of headroom to keep up with the most enthusiastic crowd and not run out of bass.

So turn it up, and keep it up. BASS is good for you.

BASSBOSS not responsible for noise complaints.


Hand-Built Cabinets

BASSBOSS Kraken Powered SubwooferThe Kraken is a vented, short-horn, quad 21″ bandpass subwoofer. The four drivers are loaded into a large acoustical volume that is tuned to a very low frequency, and each is front-loaded onto a short horn. The vented enclosure section provides extended low frequency performance and the horn section provides increased upper frequency sensitivity and improved transient response.

BASSBOSS cabinets are hand-assembled in the USA. They are meticulously constructed from 18mm Baltic Birch plywood, using dado joints, screws, extensive bracing and advanced composite adhesives.

The enclosures feature UHMW Polyethylene sliders on all four sides, with corresponding recesses in the opposite sides to facilitate interlocking the boxes when stacked. Each Kraken includes a transport cart which also features recesses that the feet lock into for secure transporting.

Prodigious Amplification

tops-amps-sm8000W RMS of amplification and comprehensive DSP. The amplifier is rated for RMS output using continuous sine wave signal. This is not a Peak or Burst power rating. You’re not going to be using your sub in millisecond bursts. For subwoofer applications, “peak” and “burst” power ratings are largely irrelevant.

The amplifier is capable of delivering 8000W of continuous output. This ensures the amp isn’t the limiting factor in the output of low frequencies. Providing abundant power prevents overheating issues and virtually eliminates the damage that clipping a too-small amp can cause.

For larger events, several arraying options are available. Block arrays, side-by-side arrays and front/back Cardioid arrays can be deployed securely thanks to the interlocking feet. Presets are included in the DSP.

Rugged Drivers

All that electrical amplification power is converted into acoustical energy by four high-efficiency, long-excursion 21″ Neodymium motor woofers

High-intensity Neodymium magnets are lighter and provide higher efficiency so the result is a lighter and louder cabinet. Split-wound coils produce a more linear force through the range of movement of the cone, which results in lower distortion and improved linearity at high output.

The cones are waterproofed to protect them from possible, accidental exposure to moisture such as rain or spilled beverages. Waterproofed woofer cones also permit the cleaning of drivers that have been soiled in a dirty or dusty environment with the use of a damp cloth. Keep the amplifiers dry and party on!

Waterproofed cones in all products. Optional weatherized and weather resistant loudspeakers have the same acoustical performance as our standard options. If your system is likely to be exposed to rain, ask about IP rated amplification options. If you have need of a system for outdoor installation, ask about Weatherized products.

Focused Tuning

BASSBOSS subs can be connected directly to your mixer with nothing but signal cable in between. The built-in processing is comprehensive and yet minimal manipulation is applied to the signal. The processing includes only a high pass filter and a low-pass filter. There is no need for any EQ in the signal for the speaker to provide a broad, flat frequency response. A sophisticated limiter system protects the woofer from thermal and over-excursion damage.

Plug-and play with peace of mind. Multiple, sophisticated protection systems make the loudspeaker virtually indestructible. You can turn on and turn up, all night, without fear of over-driving to the point of damage.

True Specifications

BASSBOSS technical specs are based on measurements of continuous performance in normal usage. Other manufacturers may specify output based on calculations rather than measurements; measurements outside the operating bandwidth; or on ‘Burst’ or ‘Peak’ readings. These are often misleading, intentionally.

BASSBOSS specifications are conservative compared to most manufacturers. They reflect what the products will achieve, consistently, in the real world. Since the real world is where you’ll be using your gear. 

Read more about BASSBOSS Designer David Lee’s specifications philosophy on ProSoundNetwork.


I want to mix all my music on The Kraken

Honorable C Note | Producer



Loudspeaker Description High-output Quad-21 inch Subwoofer
Frequency Response (±3 dB) 25 – 90 Hz
Maximum Sustained Output 145 dB SPL, 1 meter, half-space (ground plane)
Max SPL (Peak)* 148 dB
Nominal Dispersion (H° x V°) 360 x 360 – Cardioid Mode Available with Multiple Boxes


Amplification 8000 Watt Continuous RMS Class D Subwoofer-Optimized
Processing Integrated comprehensive DSP provides high pass, low pass, phase alignment, cardioid procesing and limiting
Electrical Connectors, Amplifier 2 X Neutrik powerCON Input (Blue) NAC3FCA
Electrical Connector, Mains 2 x Standard US 3-pin 120V electrical plug: NEMA 5-15 (Edison)
Voltage Operating Range 90-132VAC, 55-65Hz
Current Draw, Nominal 8A (2 x 4A) @ 120 volts (typical, 1/8 max power)
Signal Input Connector XLR-F
Signal Output Connector XLR-M (pass-through only)


Enclosure Type Vented, short-horn hybrid
Transducer 4 x 21 inch diameter (540 mm) neodymium motor woofer with 58 mm (2.28″) peak to peak excursion. Waterproof fiber composite cone
Cabinet Construction 18mm Baltic Birch plywood, dado joints, stainless steel hardware
Dimensions Vertical (HxWxD) 48 in. x 48 in. x 36 in. (49 in. high with feet)
Net Weight 460 lbs
Shipping Weight 550 lbs
Exterior Finish Rugged, weatherproof, black textured, bonded high-pressure polyurethane coating
Grill Perforated, powder-coated steel
Feet UHMWPE strips x 8, 2 on e each of 4 sides
Handles 20 x Steel bar handles


Flying Hardware Rigging system included with Kraken Global version
Suspension System Support Frame for multiple boxes
Amplification for Installation Complete power package including DSP in two space rack chassis for permanent installations
Installation Version Available without handles and pole sockets
Transport Dollies Included – Dolly cart with 4 locking casters and recesses to accept interlocking cabinet sliders. Constructed of Birch Plywood. 1400lb max capacity. 49″x36″x6″)

Our proactive philosophy causes specifications to be subject to change whenever improvements are made.

*Peak output is calculated using “industry standard” techniques. These calculation methods create theoretical specifications that are inflated over what can actually be achieved. BASSBOSS real world output specifications are provided as “Maximum Sustained Output” ratings, which reflect actual measured, continuous output levels.


Kraken Quad 21″ Powered Subwoofer

Brings the love of extended low frequency together with need for horn-loaded hits. You’re no longer forced to choose either deep OR punchy, the Kraken offers both. Ideal for shows that span a lot of genres and need intense dance-floor coverage.


Contact us for assistance!


Business and Consumer Financing - Apply Online

Want to finance a dream system in easy monthly installments? Apply here.

Have questions regarding financing BASSBOSS gear?
Give us a call - we're happy to help.

We now accept the Synchrony home card!


Shop again and again at thousands of participating retail locations, for your audio & home needs.*

  • Promotional financing offers** with convenient monthly payments
  • A dedicated credit line for home purchases (flooring, furniture, appliances, electronics and more)
  • No annual fee for new accounts
  • Special sales events and savings offers* from participating retailers
  • $0 fraud liability
  • 24/7 secure, online account management tools

*Subject to credit approval **Participating locations


Synchrony Home Card Main Page | Synchrony Home Card Application Page

BASSBOSS offers financing through industry leader Hampton Ridge Financial.

Ideal if you are NOT running an existing audio-business. Click here to apply.

Financing for equipment purchases of $3,000+ Click here to apply.


  • 60 days to pay with no interest!
  • Convert to a 12 month loan or pay off in 60 days
  • Get started in minutes, no obligation
  • Apply with a business checking account, not your credit score

Pay now or pay over time with PayPal Credit. Just use PayPal Credit in PayPal checkout.

No Interest if paid in full in 6 months on purchases of $99 or more.

✛ Synchrony Home Offer – cannot be combined with any other offers or prior quotes, interest is deferred during the promotional period, the entire finance amount must be paid by the end of the promotional period to avoid finance charges, not valid on dealer sales, additional terms and conditions may apply. Please contact our sales team for details and sales assistance.


BASSBOSS custom-designed covers protect your Subs and keep them looking new for years to come. Made in the USA, covered by an unconditional lifetime warranty. Keep your investment protected from gig wear and tear.


BASSBOSS Custom Cover for ZV18 Powered Subwoofer

Add your company logo to your custom covers. Silk screening of your logo available on all custom covers.


Silk-Screened Customer Logo for Speaker Covers

Custom Fit Wheel Dolly Cart made of Baltic birch, bed liner coated, with extra heavy duty locking swivel casters.


Custom Wheel Carts for All Subs
System Builders

Want to roll your own?

Mobile Guided System Builder for one-person use.

Production Builder for larger mobile systems.

Pre-Built Systems are ready to roll.

BASSBOSS Catalog for the full catalog.

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