The Thin and Light Astell & Kern AK Jr High Resolution 64GB Music Player. The AK Jr project gives everyone the opportunity to comfortably listen to high resolution audio, anytime and anywhere. Although previous Astell & Kern models were designed as portable devices, the relatively large size made them less convenient for some. The AK Jr’s compact design delivers the highest sound quality while fitting comfortably in your pocket. So buy this Astell & Kern AK Jr High Resolution 64GB Music Player - The Starting Point of Music - £399.00.