Marantz AV 10 Home Theater Preamplifier / Processor - Audio Advisor Inc.
4-Channel Home Theater Bluetooth Preamplifier - 3000 Watt Stereo Speaker Home Audio Receiver Preamp w/ Radio, USB, 2 Microphone w/ Echo for Karaoke, CD DVD Player, LCD, Rack Mount - Pyle PD3000BT - Newegg.com
Trinnov | 36-Channel Reference Immersive Sound AV Processor