Marantz AV8805A Networking AV Preamp Processor - Audio Advisor Inc.
Marantz AV 10 Home theater preamp/processor with 15.4-channel processing, Dolby Atmos®, Apple AirPlay® 2, Bluetooth®, and HEOS Built-in at Crutchfield
Amazon.com: Pyle 4 Channel Wireless Bluetooth Amplifier - 3000 Watt Stereo Speaker Home Audio Receiver w/ FM Radio, USB, 2 Microphone w/ Echo for Karaoke, Front Loading CD DVD Player, LED, Rack