DD Audio 21" Dual 1 Ohm 10000W Peak/2500W RMS Power Tuned Subwoofer 99 — Big Jeff Online Inc
Skip to content
Free shipping with delivery in 2-4 days See details
Free shipping with delivery in 2-4 days See details




DD Audio 21" Dual 1 Ohm 10000W Peak/2500W RMS Power Tuned Subwoofer 9921b

SKU DD-9921B-D1
Sold out
Original price $1,873.99
Original price $1,873.99 - Original price $1,873.99
Original price $1,873.99
Current price $1,499.00
$1,499.00 - $1,499.00
Current price $1,499.00
Snap Logo Lease for as low as $/week Learn More

Free Gifts when added to Cart

The more you spend, the greater selection of free gifts you'll have at your fingertips when selecting items in your shopping cart!

Spend More, Save More

Big Jeff loves his customers!!!
  • Spend $250, Save 3%
  • Spend $500, Save 5%
  • Spend $1000, Save 10%
  • Spend $1500, Save 11%
  • Spend $2500, Save 12%
  • Spend $5000, Save 15%

*Does not apply to: AudioControl, Sundown, XS power or Kicker products*

*Does not stack with other promotional sales*

This is a Sample Product Title
Was $200.00 Now $100.00
  • Unparalleled Power and Performance: Engineered for 1500 - 2500 Watts RMS with peak capabilities of 10000 Watts
  • Massive Bass Output: Delivers profound and precise bass with a 21-inch size and 22 MM Xmax
  • Robust and Durable Design: Built with high-quality components for sustained high-performance
  • Optimized for Large Enclosures: Perfectly suited for 6.0 - 8.0 CuFt ported enclosures, offering expansive sound dispersion
  • Ideal for Advanced Setups: Allows for creative and complex system designs for the ultimate audio experience

DD Audio 21" Dual 1 Ohm 10000W Peak/2500W RMS Power Tuned Subwoofer 9921b

This Listing Includes:

  • (1) DD Audio 9921b 21 Inch Power Tuned Subwoofer

The 9921b, known as "The Beast" in the DD Audio 9900 series, is a subwoofer designed for the most demanding bass enthusiasts. It's a dream for those fascinated by the physics of sound, offering endless possibilities in system design with its precision in low-frequency delivery. The 9921b is a 21-inch subwoofer that combines massive power handling capability with precise audio engineering. It's optimized for 1500-2500 watts of RMS power and can handle peak bursts up to 10,000 watts, making it an ideal choice for audiophiles looking for deep, impactful bass and high-quality sound.


  • Speaker Size: 21 Inches

  • RMS Power: 1500 - 2500 Watts

  • Peak Power: 10000 Watts

  • Impedance: Dual 1 Ohm

  • Voice Coil Diameter: 4 Inches

  • Piston Diameter: 18.25 Inches

  • Fs: 26.24 Hz

  • Qms: 5.265

  • Qes: 0.517

  • Qts: 0.471

  • Vas: 161.9 Liters

  • Xmech: 92 MM

  • Xmax: 22 MM

  • Frame Outer Diameter: 21 5/16 Inches

  • Frame OD w/Gasket: 21.31 Inches

  • Mounting Diameter: 19.25 Inches

  • Mounting Depth: 11.31 Inches

  • Motor Diameter: 10.31 Inches

  • Motor Depth: 4.56 Inches

  • Woofer Displacement: 0.55 CuFt

  • Recommended Ported Enclosure: 6.0 - 8.0 CuFt

  • Shipping Weight: 92 Lbs


  • Designed for audiophiles with an interest in low-frequency physics.

  • Capable of handling extreme power for intense bass experiences.

  • Precision engineering for accurate sound reproduction.

  • Ideal for creating custom audio systems with endless design possibilities.

Payment Information


We accept PayPal for all ebay orders. You can use your credit through PayPal as all major credit card are accepted by PayPal.

We accept PayPal for all international orders, your address must be verified with PayPal.

We are not responsible for any custom duties or brokerage fees that may apply for all international orders.

When you click on the Buy it Now button you are entering into a
contract whereby you agree to purchasing the item at the price listed.

If you want to ship your item to an alternate address please add
that address on your PayPal account and use the address as the default
or confirmed address to pay us through PayPal

With Free Same Business Day Shipping we work to get you your order Fast. 


All orders over $500 will require a signature for delivery.

All pre-selected shipping rates and methods are for customers with a
valid residential or commercial address within the Contiguous 48 United
States (PO Boxes address may require additional charges).

P.O. Boxes, APO/FPO addresses, Alaska, Hawaii, Puerto Rico, Guam,
U.S. Virgin Islands, Northern Mariana Islands, American Samoa, Canada,
and other countries may require additional shipping fees. Please contact
a member of our team for detailed shipping charges.

Shipping is available only to PayPal verified addresses. When making
payment please confirm your address has been verified with PayPal. Once
payment is made shipping address can not be changed/altered. Payments
made using an unverified PayPal address will be refunded and order will
be canceled.

We will not accept request to change shipping address once payment
has been made. Please confirm your shipping address is up-to-date and

Typical handling time for orders is 1-business day. We do our best
to ship every package with-in 1 business day of receiving a cleared
payment. In some circumstances additional time may be need, in which
case we will contact buyer.

Shipped orders that are returned by the shipping company due to an
insufficient address or an undeliverable address will be refunded less a
20% restocking fee.

If package is refused or marked undeliverable and returned
back to us by the carrier, you will need to pay the shipping cost in
full to have the package sent back to you or we can refund the money
minus the cost of shipping


If you have not received your package, but the tracking information shows that it was delivered,
please do the following within 36 hours of expected, stated delivery:


Verify the shipping address on the order is the address where you are looking for the package

Look for a notice of attempted delivery

Look around the delivery location for the package, or see if a neighbor has accepted the delivery

Be sure to double check your mailbox and other usual spots for package delivery


If you think that your package has been stolen, we will require a police report since this is now theft.
Once we have a police report on file for the stolen package, we will reship your order.

Customer Reviews

Be the first to write a review