I believe the Timepiece is based on the work of Earl Geddes, a renown pro-audio engineer/scientist who used to work for JBL but is now a top level consultant. The dominate idea is to cross the low frequency driver over to the high frequency driver at the point of equal dispersion characteristics of the individual drivers. This is reported to produce a more seamless transistion. Actually, from what I understand, it is downright seamless.
http://www.gedlee.com/
http://www.gedlee.com/