The SA550 features a Class G design which is more efficient than many conventional Class AB amplifiers. An old-style JBL logo adorns the brushed aluminium front panel. There is good connectivity with four analogue and three digital inputs. Finally, there is a built-in MM phono preamp. You can connect mobile devices via the hi-res Bluetooth receiver.

The SA550 has a class G output. Class G works by having two power supply rails. One is used most of the time, when at normal volume levels, however at high volumes a more beefy supply kicks in. This rail is usually in “sleep” mode, to reduce power consumption. The design provides ultra-low distortion along with 90W of power into 8 ohms.

• Advanced integrated amplifier with Classic Styling
• Bluetooth input with Hi-res AptX Adaptive technology
• Walnut veneer side panels match JBL Classic and Studio Monitor loudspeakers
• 3 Digital Inputs with Coax and Toslink connections
• High resolution DAC with ESS ES9038K2M DAC chip
• 4 analog inputs including MM phono stage
• Class G amplifier topology for ultra low distortion