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Sometimes a coaxial is the best solution... and sometimes you need to mount the tweeter separately. It's great to have complete flexibility.
Coaxial or Component: Both approaches can yield excellent results.
Coaxial mounting has the benefit of placing the tweeter in close proximity to the acoustic center of the woofer, resulting in more coherent output and predictable crossover behavior. From a purely practical perspective, it also avoids having to separately cut a hole for tweeter mounting.
Separate mounting has the benefit of placing the tweeter where it is less likely to be blocked by legs or other obstructions. As long as you don't separate the tweeter too far from the woofer, this approach will still yield good coherence and predictable crossover behavior.
JL Audio's C3 Convertible Components give you the option of installing the speakers as separate components or as coaxial systems (tweeters mounted onto the center of each woofer). In coaxial mode, the tweeter installs onto a post that attaches to the top of the pole piece with a bayonet-mount mechanism. Short leads are used to connect the tweeter to dedicated terminals on the pole piece (see figures A-D). In separate component mode, a phase plug installs onto the pole piece via the bayonet-mount mechanism (see figures A & F), and the tweeter can be installed with the supplied flush-mount or surface-mount fixtures.