JVC UX B1013 ... any information?

I acquired these for parts but thet are weird. At the front is a 4" woofer with a tweeter and a port. To the rear is another 4" woofer & another port. The tuning frequency of the ports differ.

Can anybody follow JVC's thinking?
 
Flared port at the front, smaller, striaght port at the rear?
The two ports would combine to a single tuning if the woofers share the same chamber.
Screen Shot 2024-11-14 at 10.22.44 AM.png

Cuffing won't be heard much from the rear port, so being straight saves a few cents in cost.
The three ohm load would indicate the woofers are probably in parallel.