The essential difference between the P6 and the other speakers in this series is a B&W trademark - the free-mounted tweeter - "tweeter on top". ● Combining a 165mm dia Cobex® bass drive unit with the Kevlar® bass/mid-range drive unit and a larger cabinet volume, the P6 delivers high power handling and efficiency with superb bass extension. T echnical highlights Kevlar®: B&W developed and patented the method of using Kevlar® for loudspeaker cones to reduce unwanted standing waves. DuPont originally created Kevlar® for use in bulletproof vests. ● Tweeter on top: B&W's Tweeter on top technology ensures that the sound remains focused and time-sensitive and that the stereo-image is presented with unparalleled three dimensional accuracy.