2 x Rectangular Passive Bass Radiator Flat Diaphragm 70mm x 80mm x 12mm | eBay
Denon AVR-X2700H 7.2-Channel 8K Ultra HD AV Receiver with 3D Audio and HEOS Built-In with Denon Home 250 Wireless Streaming Speaker (Black) | World Wide Stereo
Denon Home 250 Medium Wireless Speaker with HEOS® | Denon™
Amazon.com: Denon Home 250 Wireless Speaker, HEOS Built-in, Alexa Built-in, AirPlay 2, and Bluetooth, Compact Design, Black : Electronics