Totem Wind Design 3 Way 4 Driver Floorstanding Speaker (Pair) Color:Dusk ThunderBird 48 features 10% Silver Plated ID:Coverage#810 ThunderBird 48 features 10% Silver Plated Copper conductors and drains with AQ’s Level 5 Noise Dissipation technology: high loss graphene is added to the carbon layer sandwiched between layers of metal around the 4 FRL + eARC pairs designed to complete the Sennheiser audio experience and perfectly complement its high end audiophile headphone range for the ultimate acoustic performance The rear skid plate decoupling system allows for additional spatial performance The deep luster finish not only adds shine but also allows for a more cohesive acoustic behavior