Alongside the DAC and amp components, there's a middling quad-core Qualcomm Snapdragon 400 processor taking care of the digital duties, making sure the Android 4.3-based OS runs smoothly.

These are fine margins, but for £400 we are allowed to be greedy. Acoustic Research has designed a quality product, but it isn't quite capable of blowing its competitors out of the water. See all our ...