16 ANGLE - Get the most out of your speakers by tilting them toward your ears, ensuring you never miss out on those higher frequencies. ^^ MOUNTING HOLE - Secure YU4 or other compatible speakers in place with the provided 1/4"-20 screw. ^^ Foam padding - Maintain stability and reduce undesirable resonance. ^^ MINIMALISTIC DESIGN - S4's low-profile design keeps your desktop looking clean. ^^ SOLID METAL CONSTRUCTION - Premium build quality and ultra-stable design to keep speakers in place.