are you sure both subs are still working? Sounds like one stopped working and now the other is in twice the airspace with a passive radiator.
Custom box builds for FL:
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Refs: diyma-sold to:Mazda3SQ CA.com-traded:matrxx dude CACO- Sold to: Ajax_6154, brandonb1029, TeejayBee, xx-wade-xx, traded with: papito FLSPL- Bought from:98chevySPL, JBLCAMRY, traded with:97montecarlo, thumpenranger