In 1985 Studio 3, the biggest studio complex so far, was built. This facility with its vast space offered enough room for orchestras, choirs and big bands. Thanks to its mobile camera and lighting rigs as well as its highly efficient air conditioning system it was also designed for film and video recordings and conformed to the standard of American mega studios. Since all facilities were connected via a subterranean corridor it was possible to switch around and use the entire technical equipment range of all three studios. At the same time the canteen located between Studio 1 and the studio kitchen was enlarged as well. Deep Purple's keyboardist Jon Lord produced his first solo album Sarabande at Dierks Studios. Meanwhile, major US record companies chose Dierks to produce their artists. Among them were Geffen Records' glam metal band Black 'n Blue, heavy metal rockers Twisted Sister who Dierks produced in New York and Los Angeles for Atlantic Records, and Capitol Records' New York punk avant-garde group Plasmatics. US band Mother's Finest recorded a live album with Dieter Dierks as well, using the audio and video mobile with the mixing being done afterwards at Studio 3. In 1986 the Dierks Studios Mobile 1 – put into action all around Europe to record concerts of renowned artists and having proved to be of good use for live broadcasts of the WDR channel shows Rock Palast and Rocknächte – was replaced with Mobile 2, a unit of almost twice the size. This mobile featured analogue and digital recording devices, a computerised mixing console, a state-of-the-art auditory system and, a big lounge area. In 1991 this mobile studio was used to record a Rolling Stones live album in Moscow and other European cities.
