Rockford Fosgate RFD2218 - Manual (Page 7)

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This manual outlines two specific types of enclosures that
provide distinctly different performance. This section is to
help you decide which type is best for your application.
Sealed
Sealed enclosures are the simplest to build. The most important part of
building a sealed enclosure is to make sure that the enclosure is airtight.
Using glue and some type of sealant on all seams will ensure solid con-
struction and prevent air leaks. The box volume will directly impact the
performance of the speaker. Larger enclosures will provide flatter
response and deeper bass where smaller boxes will provide a bump in
the response curve and generally higher output for greater SPL.
Advantages of sealed enclosures:
•Small enclosures
•Linear (Flat) response
•No port noise
•High power handling at all frequencies
•Excellent for sound quality
Recommended Enclosures
Vented Enclosures
Vented enclosures vary only from the sealed enclosure 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 but with noticeably more output at the tuning
frequency.
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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