Effortlessly fill any living space with the power of incredible, true stereo sound that brings your listening experience to life. An all-access pass to all your music on any app or device, the HD4 offers wired or wireless connections including USB input from your computer, Bluetooth aptX-HD, phone, tablet, computer, or good old analog, such as turntable or prized tape deck. The HD4 system also features a high-quality headphone amplifier for private listening.  Quick and easy setup, with no network setup, no passwords, no hassle.  Versatile playback in any room, from any app or device. High-fidelity stereo sound for desktops and small spaces.  Modern, compact design that fits in and fills up any room.  Low-latency Bluetooth aptX-HD, extended-range wireless streaming, and analog input for easy turntable connection. Aramid fiber woofers and silk dome tweeters.  Built-in power amps wrapped in precision tuned, hand-built and finished wood-veneer cabinets