Demanding audiophiles are the target of ESX’s superior D68SP digital audio processor. This class-leading eight-channel output device makes skillful use of high-grade components, including an AKM ‘Velvet Sound’ DAC and 295MHz/32-bit Analog Devices DSP, to deliver a sublime performance. There’s deep customisation potential, too, thanks to newly designed PC-based software that gives precise, detailed adjustments of its multiband EQ, subwoofer control and more. Opt for ESX’s BT-D Bluetooth (5.0) upgrade and real-time control – plus hi-res audio streaming – can be marshalled by a smartphone. High-performance but still eminently affordable, this is a processor that will appeal to any car audio enthusiast.