- Xmax = 19mm one-way by 70% BL
  - RMS Power = 1000-watts
  - Vented magnetic gap
  - Optimized high-velocity pole vent
  - Innovative high-velocity vented frame spacer ring
  - Black Aluminum 2.75” voice coil former for superior heat dissipation
  - High Temperature copper voice coil wire
  - Large aluminum faraday ring (Magnet ID)
  - Spring Loaded Terminals
  - Stitched-On Double “XL” Tinsel Leads to prevent fatigue and failure
  - High strength cast aluminum frame
  - Optimized for small ported, sealed, & band-pass enclosures
  
 List of upgrades compared to the v1 SA series (Rev.1,2,3):
  - Magnet outer diameter increased from 180mm to 190mm
  - Magnet slugs increased from 25mm to 27mm in height (total 4mm more height)
  - Motor structure fully bolted together with 3x M6 bolts (eliminates the possibility of motor shifting)
  - Top-Plate “Slits” implemented as with the X and Z series. Increased cooling & reduced distortion.
  - Improved gap venting — more / flared gap vents.
  - Improve pole-vent design — smoothly flared on both sides.
  - Coil increased from 63.5mm (2.5″) to 70mm (2.75″) in diameter. Higher thermal capacity.
  - New “U series” style cast-aluminum frame for taller cones (more x-mech both top-side from cone to spider and bottom from spider to top plate)
  - Aluminum cast gasket to bolt-on surround.
  - Aluminum cast vent ring to enhance thermal transfer from motor to the frame.
  - Standard with double “XL” leads and “bolted-on” spider
  - Larger and thicker surround (same tooling as U series).
  - Strongest paper cones we have ever produced… new two-piece mold technique.
  - “Large Flange” dust cap just like our larger woofers. Essentially eliminates dust-cap glue failure.
  - Larger spider diameter on the 12/15″ models (the 10″ retains the same 188mm spider)… 12″ up to ~200mm and 15″ up to ~210mm
  - Improved spider material for longer life.