The R990BT powered amplified bookshelf speakers offer a sound that is full of presence and depth. Designed for enhanced bass, the R990BT bookshelf speaker system is calibrated with a flared bass reflex port. Resulting in rich detailed sound that will take your breath away. This flared bass reflex port is encased in a 100% medium-density fiberboard wooden enclosure. The wooden accent encompassing the full package of the bookshelf speakers compliment both a home, studio and office setting. The classic wood finish enclosures are brilliantly designed to minimize acoustic resonance while simultaneously producing a clean finish any audiophile will enjoy.