Downward firing subwoofer


I have a downward firing box with 1 sub & 1 passive sub. Can I remove the passive sub and put an actual sub, or will this cause issues as far as clarity.
rickregal
Who makes it? Why would you want to? Is the passive in bad order?

Regards
rickregal, you would have to remove both units, calculate the volume of the enclosure and find two subwoofer drivers that would operate together in that volume and fit the holes you have. Not likely. You might as well start all over.