[font=Arial, Helvetica, sans-serif][size=2][left]Mark IV[/left][/size][/font][size=2][left]’[/left][/size][font=Arial, Helvetica, sans-serif][size=2][left]s third core area, professional audio equipment, produced recording studio equipment, systems for live performances, and products for permanently installed sound systems. Its products included amplifiers, microphones, mixing consoles, signal processors, and loudspeakers. Consolidation of the audio industry in the early 1990s was a boon to Mark IV because it could acquire companies that were well known and respected. Mark IV[/left][/size][/font][size=2][left]’[/left][/size][font=Arial, Helvetica, sans-serif][size=2][left]s audio equipment was sold under its division names, Electro-Voice, Altec, Vega, Dynacord, Gauss, Klark Teknik, and University Sound. Mark IV sound systems were used in the 1991[/left][/size][/font][size=2][left]“[/left][/size][font=Arial, Helvetica, sans-serif][size=2][left]Monsters of Rock[/left][/size][/font][size=2][left]”[/left][/size][font=Arial, Helvetica, sans-serif][size=2][left] tour in [/left][/size][/font][url="http://www.encyclopedia.com/topic/England.aspx"]England[/url][font=Arial, Helvetica, sans-serif][size=2][left], Europe, and [/left][/size][/font][url="http://www.encyclopedia.com/topic/Russia.aspx"]Russia[/url][font=Arial, Helvetica, sans-serif][size=2][left], as well as at Euro Disneyland, which had the largest computer-controlled sound system in the world when it opened in 1992.[/left][/size][/font]