2015-06-01 旭化成エレ、USB DACやSACD向けの新DAC「AK4452」など - AV Watch http://av.watch.impress.co.jp/docs/news/20150522_703112.html http://www.akm.com/akm/jp/aboutus/news/20150522AK4452AK4454AK4456AK4458_001/