What is the ideal box size for my midrange speakers?
Assuming your 3″ / 4″ / 5.25″ / 6″ / 6.5″ speakers are midrange drivers and not subwoofers (Focal make a 5.25″ subwoofer for example), you shouldn’t need to make a sealed enclosure for it. In most cases (but not all) there is no need to build sealed enclosures for these midrange drivers because their suspension (the spider and surround) is designed to operate in an infinate baffle situation such as a door or rear deck of a car. In other words, most midranges are free-air drivers. However, it’s always best to consult the manual for your new speakers if you’re not sure.
