The best replacement for sealed is ported.

The best alternatives to sealed are rated as following:
★★★★★  ported
★★★  open burners
★★  ported box
★★  vented
★★  expunged
★  ported enclosure
★  ported subwoofer
★  bandpass
★  ported enclosures
★  open burner
★  shielded bearings
★  draft
★  ported speakers
  ported boxes
  final
  flooded battery
  vented enclosure
  sealed
  ported speaker box
  ported alpine type r
  vented box
  ported subwoofer box
  polished concrete
  shielded ball bearings
  open gas burner
  ported sub
  ported sub box
  ported subs
  open gas burners
  abstract c#
  vented sub box
  ported subwoofers

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Google Trends

Scale is based on the average worldwide traffic of sealed in all years. Click on graph for more.
sealed
ported
open burners