VDN OTL Tube Technology is a Trademark for audio products that
are being manufactured in Croatia, by our company - VDN Elektronika d.o.o. The company was estublished in 1992. by the two University degree electrical engineers - Mr.Ivo Vodanovic and
Mr.Zlatko Doresic. Company's primary business is the design of the special power supplies, specialized regulation circuitry and custom battery packs. VDN Elektronika is located in the city of Zagreb, Croatia's Capitol city.

Sito ufficiale della Dolby Digital