The JBL SA550 Classic is inspired by the classic JBL SA600 amplifier from the 1960s, with retro styling and walnut veneer side panels to match JBL Classic and Studio Monitor loudspeakers on the outside. On the inside, the JBL SA550 is a music system for today using an advanced amplifier topology with high power output, inventive efficiency, and fine noise control for captivating musicality and effortless power. Straight out of the box, pair your smart phone or tablet to the SA550 Classic with Bluetooth for instant high-quality music from all your music services and libraries that you listen to everyday. The JBL SA550 Classic includes the latest Bluetooth AptXAdaptive technology for hi-res audio over Bluetooth and low latency to ensure audio is in sync with video. All digital audio is rendered using a reference high resolution DAC with time domain jitter elimination for perfect sound, every time.