Rockford Fosgate RFP3408 Installation & Operation Manual page 7

Recommended Enclosures
Vented Enclosures:
Vented enclosures vary only from the sealed enclosures in that a vent or
port is added to "tune" the enclosure. The enclosures recommended are
designed for great overall performance. Larger boxes tend to be easy to
tune to lower frequencies while medium and small boxes are easier to tune
to higher frequencies. The vented design is less linear in response than the
sealed box with noticeably more output at the tuning frequenc
Advantages of vented enclosures
•Higher average output than sealed
•Tuning frequency can be easily adjusted by changing port length
•Deep bass response with lower power requirements
•Great for high output with limited power
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