Was a request by A1B3DD2512 of another forum for his SA12s. Wanted good low end extension while retaining a smooth response and musicality for a daily driver.

The completed design:
4xSA-12s smooth low extension - $15.00 : TheBoxHouse, Enclosure designs

Flush mounted by request as well.
As always, care was taken to dial in the characteristics of the box to produce the best sound possible within working limits.

Should sound nice and play everything in White Girl quite well.