I vote for edgewound VCs and the use of aluminum in them, compression drivers, alnico, and if appropriate, ring radiator diaphragms.
An off topic ramble that some might find interesting.
The parent company of Lucent is Alcatel, which is French, and together have become Alcatel-Lucent a couple years ago. I'm a former Lucent Technologies employee and victim of the layoff of over 1/2 of their employees (approx. 240,000 before the layoffs) starting in 2001. AT&T spun-off Lucent in the early 90's, which included Bell Labs and the businesses that once were called Western Electric, Bell Labs the "R" and Western Electric the "D" of the R&D portion of the company.
Lucent had nothing to do with the original divestiture of AT&T as implied earlier in this thread, but was a result of it to some degree. Lucent made and serviced the telecommunications equipment used in telephone networks, both land and cellular which was formerly done under the Western Electric name.
After divestiture (among other things, allowing other companies to use the existing telecommuncations infrastructure) Sprint and MCI came into being. Simply put, since AT&T was their competitor, they would not purchase their equipment. Lucent was created in part to solve that quandry. It worked to some degree, and for a while Lucent did well, particularly in the burgeoning cellular business, that I worked in among others.
Ironically, AT&T contributed to Lucent's downfall. AT&T was preparing to replace much of the equipment in their network, with new generation equipment that was still being R&D'd by Lucent. A multiple 100 million dollar contract was suddenly cancelled by AT&T. With other contributing factors, Lucent's stock went from about $70 a share, down to 50 cents! My 401K is bloodied to this day from that. When the first buyouts were offered, I jumped and did not regret it.