Going for a sealed myself on the wetsounds (which can not use free air per the specs).
https://wetsounds.com/pages/products/XS-12_spec.htmlSEALED ENCLOSURES
XS-12 S4 1.1 cubic ft. 13H x 14W x 11D
This enclosure is made up of a totally closed, air-tight box. This type of enclosure gives excellent, tight bass response, as well as providing an
effective control of loudspeaker excursion, maintaining it within reasonable limits and generally providing lower distortion and very high volume levels. If you
build your own enclosure, WETSOUNDS recommends that you glue and screwall joints using enough adhesive to ensure that all joints are air-tight.
VENTED ENCLOSURES
41 Fb (Hz) - 1.7 cubic feet - 15H 16W 12.5D - 4d 10l
Vented enclosures are not air-tight and incorporate an additional opening known as a port or vent, which is generally fabricated from either
plastic or cardboard tubing. The port augments the sound coming out of the woofer and is in most cases capable of going lower in frequency than the same
woofer in a sealed box. Even though vented enclosures are not air-tight, you should follow the same procedure as with sealed boxes and glue and screw
together all joints.... The dimensions ... are intended as a guideline and specific dimensions (HxWxD) may be used provided the internal volume of the enclosure is maintained. In the special case of SEALED enclosures, volumes greater or smaller than specified in the table can be chosen, with different results. Smaller enclosures lead to a more enhanced response and higher power handling whereas larger ones exhibit better
transient and more extended response.