The enclosure is equally as important as the woofer and should be designed for use with the particular woofer you have chosen.
Deciding which enclosure(s) and woofer(s) are best for you can be a task all of it's own, but size constraints of the vehicle, knowledge of Thiele - Small parameters, and understanding the inherent sound characteristics of different enclosure designs will help you decide.
All enclosures should be constructed of at least 5/8'' - 1'' MDF (medium density fiberboard) or material of comparable rigidity or better. Bracing should be used throughout the enclosures as needed to prevent any loss of energy due to flexing.
There are many types and variations of enclosures.
• Second Order / Infinite Baffle / Free Air
• Typical Rear Deck Installation/Infinite Baffle/Free
• Back Seat Installation
• Small Deck Installation
• Second Order/Acoustic Suspension/Sealed Enclosures
• Sealed
• Isobaric - Sealed
• Isobaric - Sealed (Compound Loading)
• Isobaric - Sealed (Back to Back)
• Isobaric - Sealed (Planar Loading)
• Fourth Order / Bass Reflex & Bandpass Enclosures
• Fourth Order / Bass Reflex
• Isobaric - Bass Reflex
• Isobaric - Bass Reflex (Compound Loading)
• Bass Reflex - Passive Radiator
• Isobaric Bass Reflex - Passive Radiator
• Single Reflex - Band Pass
• Isobaric Single Reflex Bandpass
• Three Chamber Single Reflex Bandpass
• Isobaric Three Chamber Single Reflex Bandpass
• Sixth Order Enclosures
• Quasi Sixth Order Series-Tuned Bandpass
• Isobaric Quasi Sixth Order Series-Tuned Bandpass
• Dual Reflex Bandpass
• Isobaric Dual Reflex Bandpass
• Three Chamber Dual Reflex Bandpass
• Isobaric Three Chamber Dual Reflex Bandpass
• Eighth Order Enclosures
• Quasi Eighth Order Series-Tuned Dual Reflex Bandpass
• Isobaric Quasi Eighth Order Series-Tuned Dual Reflex Bandpass
• Eighth Order Triple Reflex Bandpass
• Isobaric Eighth Order Triple Reflex Bandpass