Superior audio quality 7.2-channel Wi-Fi built-in network AV receiver supports the latest HDMI® version and offers 4K Ultra HD upscaling, HDMI Zone B for flexible system set up, high-grade aluminum front panel and the world's most advanced features. Yamaha Bluetooth® adapter included. Wi-Fi built-in capability allows wireless connection with your household wireless router, greatly simplifying system connections to enjoy network audio and music streaming services. If no Wi-Fi router is available, the unique Wireless Direct feature not only allows you to stream music directly from your smartphone or tablet via AV Controller App's Music Play feature, Apple AirPlay etc., but also control your receiver using the AV Controller App. This AV receiver's HDMI input / output supports 4K Ultra HD video image pass-through. It also can perform 4K Ultra HD upscaling to boost a lower resolution image to super high definition resolution. This ensures compatibility with the latest super high resolution video formats. The latest version of HDMI supports 4K Ultra HD 50 / 60p input for expanding super high definition resolution 4K Ultra HD broadcasting. The Polk Audio TSi400 floorstanding speaker is the midrange tower speaker in the TSi series with three 5.25-inch woofers resulting in higher power handling and more bass capacity. It's great for high impact movies and music. Its affordable price and small footprint means they can be used as the front channels in a home theater system or as the main speakers in a music system. For home theater, pair it up with some TSi100's or OWM3's for surrounds, CS10 center and PSW series subwoofer and you'll have a spectacular sounding system! The new TSi Series is a quality-built, affordable line of high performance loudspeakers for music and home theater. The TSi Series boasts a stylish look that complements today's flat screen technology, with wood grain finishes, piano black top plates and pewter trim rings.