Your browser is out-of-date!

Update your browser to view this website correctly. Update my browser now


Mastering Engineer Bob Katz Awarded U.S. Patent

Bob Katz (pictured), mastering engineer and president of Digital Domain, has been awarded a patent by the United States Patent Office for his circuit design, “Process for Enhancing the Existing Ambience, Imaging, Depth, Clarity and Spaciousness of Sound Recordings.” Better known as K-Stereo and K-Surround, these processes recover lost or amplify hidden ambience, space and imaging, and generate stereo from mono signals without adding artificial reverberation. The patented K-Surround has been used to process re-mastered 5.1 mixes of old films for DVD release.

Digital Domain manufactures the rack-mountable DD-2 K-Stereo Processor unit with its K-Stereo process, plus a 2-band EQ and POW-R Dithering. The K-Stereo and K-Surround circuits have been licensed by Digital Domain to Weiss Engineering of Switzerland and Z Systems of Gainesville, Fla. Weiss incorporated the patented K-Stereo process in the Weiss DNA-1, a high-end, multifunctional digital mastering device. Katz uses the DNA-1’s noise reduction and ambience recovery features in his Digital Domain mastering suite.

Z Systems features the K-Surround in its z-K6 stereo-to-surround processor. The K-Surround process takes the ambience in a stereo recording and spreads it across the surround channels. In this manner, the listener is completely enveloped in the recording’s natural ambience.

Walt Disney Records recently released a limited edition boxed set of music, vocals, park rides and archived audio dating as far back as 50 years. “The K6 was a great help because it didn’t squeeze the image, which would have been a problem as we went from track to track,” says Jeff Sheridan, the re-mastering engineer for the project. “The other thing that was absolutely awesome about the K6 was the ability for the audio to remain mono-compatible. We were very, very happy with the results.”

For more information, visit, and