X21 Subwoofer Cabinet (21" Driver)

WW Speaker Cabinets is pleased to introduce the X21, the first commercially available home audio subwoofer cabinet designed for 21” drivers. X21 subwoofer cabinets are lock mitered allowing WW Speaker Cabinets to offer finished cabinets with a choice of veneers, stains and lacquer finishes. For the intrepid DIY home audio warriors wishing to handle their own finishing; raw MDF X21 cabinets eliminate the hassle of dealing with butt joints. 

All X21 subwoofer cabinets are customized for each individual driver model. Driver performance data in the cabinet is provided for each driver on the page for the driver manufacturer.  All driver openings and recesses are specific to the driver and tee-nuts are installed for mounting drivers and one Bi-Amp Speaker Terminal Cup Gold Insulated Binding Post High Power (UPC 848864017778). Screws are also provided so that you don't need to hunt for hardware. The X21 also includes port tubes and a magnetically attached grill.  Port tubes are pre-installed in finished cabinets and ship un-installed for raw MDF cabinets in order to permit finishing.  Only water-based lacquer and stain finishes are used on finished cabinets. Order your favorite driver and terminal cup (UPC848864017778) from your favorite parts suppliers, install insulation, the driver and terminal cup; no machining is required.  Please note that the cabinet is machined specifically for the Bi-Amp Speaker Terminal Cup Gold Insulated Binding Post High Power (UPC848864017778).  If any cabinet modifications are needed, please see the Cabinet Modification Tab.

The X21 Subwoofer Cabinet was designed by Mark Seaton of Seaton Sound. Seaton Sound is a leading manufacturer of high-powered amplified and passive speakers.  Mark Seaton designed the legendary AV123 MFW-15 Subwoofer and is one of the leading designers of powered subwoofers including the Submersive and F1 Submersive.

The X21 Subwoofer Cabinet dimensions are 24” (W) X 32” (H) X 32”(D). Unloaded X21 Cabinets weigh approximately 115 lbs; shipping weight is 175 lbs.  X21 Subwoofer Cabinets are boxed and shipped via common carrier.  Two people are required to remove the box from the truck unless liftgate delivery is requested.  Shipping quotes do not include lift gate unless requested. 

X21 Technical Information:

  1. Some parametric EQ and an 16-20Hz, 2nd order or greater high pass filter, is recommended for optimal performance.
  2. Operation at less than 1000W of amplification into the nominal driver load can function without a high pass filter while producing higher distortion.
  3. Recommended filter settings will be posted in the near future. Intended operating range is 16-160Hz. 
  4. Net internal volume is approximately 310L or 11 cu.ft.
  5. Dual 6" flared ports are tuned to 19Hz with very low noise operation.

WW Speaker Cabinets - Speaker Cabinet manufacturer.
Browse our online kit speaker catalogue and choice of cabinets for select drivers or contact us for a custom request.