Voila ce que j'ai tropuvé en faisant une petite recherche:
According to his website (http://www.johnmyung.com), his rig as of the Metropolis 2000 tour consisted of SWR products, namely an SM-900 head, Big Bertha 2x15" and Goliath Senior 6x10". As DT are using in-ear monitors and no backline for the current "Six Degrees of World Tourbulence" tour I can't say what JM is using currently, but I'm relatively sure it still consists of SWR products.
Donc il semblerai qu'il ai changé de matos ou alors c'est juste une question commerciale.