Amazon.com: Astell&Kern AK HC2 Hi-Fi USB Dual DAC Amplifier
Amazon.com: Astell&Kern AK HC2 Hi-Fi USB Dual DAC Amplifier,AK HC2 fripSide Edition|Astell&Kern,31fYMLlAvjL._BO30,255,255,,Amazon.co.jp: Astell&Kern AK HC2 Midnight Blue [リミテッド,Amazon.co.jp: Astell&Kern AK HC4 Moon Silver [AK4493S搭載