Top-of-the-line bookshelf speakers in the YU-series range Two 40W speakers with powerful class D amplifiers offer impressive sound clarity 5.25" Kevlar drivers ensure well-balanced, distortion-free bass and midrange while the 1" silk dome tweeters deliver flawless, scintillating highs Integrated connectivity includes Bluetooth 4.0 for wireless streaming, 2 optical TOSLINK inputs, an RCA port, and a 3.5mm aux jack input A specially tuned 2" rear bass port extends the bass response and eliminates port turbulence Sub out port lets you connect a subwoofer for even deeper bass Proudly designed in Canada