Dave Klahr, the founding Program Director of WFIL-FM as Popular 102 died yesterday in Florida. Klahr was the architect of soft rock radio, the predecessor to modern Adult Cointemporary on FM, with a music intensive vocal format predicated on texture rather than hit status. When WFIL-FM was sold to Richer Communications in 1971, Klahr continued the format as " W102" until 1972. Later, Klahr took the concept to WEEI-FM in Boston for CBS, WYNY in New York for NBC, then back to Philadelphia for the launch of Magic 103 WMGK in September of 1975. Klahr stayed in the region as GM of WVLT in Vineland in a soft-A/C incarnation, then lastly as GM of WKTU-FM, Ocean City, until his departure for Metro Networks in So. Florida, for whom he worked at the time of his death yesterday.