Review: Acoustic Research M2

Introduction and featuresAcoustic Research may not be a household name, but its M2 portable audio player is an incredible-sounding device, and a mighty powerful one too.Similar to the Pioneer XDP-100R we checked out recently, the M2 is also rocking a version of the Android operating system to give it familiar, and versatile, control software. But the M2 is filled with audio components that are even more high-end than Pioneer's player, and generates what would be ear-splitting levels of volume we