[04/12/2016] Yamaha RX-A550 5.1聲道影音擴大機 ，Yamaha RX-A550 5.1-Channel MusicCast AV Receiver with Built-In Wi-Fi and Bluetooth (Black)，內建Wi-Fi與藍芽，全新，定價$549.95，目前特價$349.98 USD。Prime境內免運費 (學生可以免費試用Prime)。哪裡買:amazon。