Receive a 20% Cash Back coupon and Free Shipping on all Denon purchases!The wireless Denon® HEOS Subwoofer adds deep, powerful bass to any HEOS device with best-in-class sound quality. It works in any room in your house with easy set up. Simply connect the sub woofer to your home Wi-Fi then pair with another Denon HEOS device. Download the free app to your smartphone or tablet and control your TV or music sounds all in one place.