After successfully launching the AK100 and the AK120 models, Astell and Kern asked themselves "What is the ultimate sound quality?" After much consideration, they moved a step further with that goal, which is to deliver the sound exactly as the artist had intended. Moving from the AK100 to AK120, they decided to move to a Dual DAC setup to create better left and right channel separation with clearer sound quality. Initially they thought that the Dual DAC setup would be enough, but while developing the AK240, they felt the need to further improve sound quality in order to accurately reproduce the original sound recording. After countless hours of research and testing, they were able to find the answer. So buy this Astell & Kern AK240 256GB Portable High Fidelity Sound System with MQS (Mastering Quality Sound) and DSD Support Now £2,199.99.