Solved! Info on fisher speaker ST430

Solution
This is called a passive radiator design. Is a compromise between sealed and bass reflex (with hole)

Sealed: accurate/tight but not efficient, soft bass.
Bass reflex: the opposite of sealed. Efficient, stronger bass but can be "boomy."

Passive radiators: Middle of the road
This is called a passive radiator design. Is a compromise between sealed and bass reflex (with hole)

Sealed: accurate/tight but not efficient, soft bass.
Bass reflex: the opposite of sealed. Efficient, stronger bass but can be "boomy."

Passive radiators: Middle of the road
 
Solution