Combine the drivers, 150watts, small enclosure volume = high probability of unwanted enclosure vibrations if there is not enough stiffness in the design of the enclosure. Looking at the picture on Facebook of the new mould there could be more stiffness In the new design of the mould. Look at the grid pattern. JBL EON's have a thick plastic case with a very strong design but you can still hear the enclosure make noise at high volumes and bass.