The S150 Series monitors meet and exceed the highest THX specifications to deliver music and movies with natural effortless realism and power. These are the original studio satellite monitors as used by many Hollywood studios. The S150 mk2 is a high performance two-way bookshelf size loudspeaker utilising three 1\" polymer coated silk soft-dome ferrofluid cooled dual-magnet tweeters with specially damped rear chambers and dual 5.25\" mineral-filled polypropylene cone magnetically shielded dual-magnet cast basket woofers.