The CCM683 is a true high-performance ceiling-mount speaker. The speaker features a 200mm (8") woven blue Aramid Fibre cone bass/ midrange driver and an aluminum tweeter in a neat circular die-cast chassis. The tweeter’s housing pivots for adjustable off-axis treble response and the die-cast chassis provides extra rigidity that results in a cleaner, faster bass. The speaker also has a three-position EQ switch for a better off-axis response. The blue Aramid Fibre cone means that the unit is well hidden behind the grille but still produces a remarkably clear and dynamic sound.
Sold as a pair.
As you move from Bowers & Wilkins' more entry-level speakers up to the CCM683, you will spend more, but you start to get into much better tech.
The CCM683 has a rotating tweeter with the same type of EQ controls as the CCM664; however, the speaker components are all upgraded. These use a 1” Nautilus™ swirl-loaded aluminum dome tweeter coupled with a larger 8” midrange/woofer. The cone material used for this driver steps up to their blue Aramid Fibre. The CCM683 is the least expensive model where you get the larger 8” woofer and these better drivers which is one reason it's on our shortlist of the best Bowers & Wilkins in-ceiling speakers.
The other reason is, these just sound fantastic for their price. If you are using the B&W 600 Series Anniversary or 700 series speakers for your main front three, these match up very well for Atmos height speakers or the surround speakers in a less elaborate 5.1 system. But, if you are using 700 level speakers for your mains, you should probably consider a higher-end model such as the CCM 7.5 S2 as it matches up even better.