Bowers & Wilkins CWM663 In-Wall Loudspeakers features a 150 mm (6 inch) blue Kevlar® bass/midrange driver housed in a die-cast chassis, providing extra rigidity for cleaner, faster bass. The speaker also incorporates a 25 mm (1 inch) Nautilus tube-loaded aluminium dome tweeter, and a three-position high frequency switch for acoustic fine-tuning. Installation is almost effortless, thanks to our new QuickDogs™ fixing system and plug-and-play connection.