Source: http://gtaust.com/news_item/category/live/id/172/RCF%20ART%204%20Series%20Guaranteed%20for%2010%20Years
Timestamp: 2019-04-24 01:51:35+00:00

Document:
The ART 4 Series marks the latest addition to the world famous ART range of portable speakers from RCF. Combining the legendary audio quality and rugged reliability of the ART 3 Series with the latest custom digital amplification technology developed for the ART 7 Series; the ART 4 delivers the best of both worlds into one powerhouse speaker.
Newly designed digital amplifiers coupled with RCF's unique transducer engineering make the ART 4 Series a cutting edge speaker perfect for any portable sound application, satisfying the most discerning professional.
For a limited time, Group Technologies is providing a 10 year guarantee for all ART 4 Series speakers sold until 01/03/2010.

References: ART 4
 ART 3
 ART 7
 ART 4
 ART 4
 ART 4