NAD T187 T 187 AV Surround Sound Preamp Processor - 7 Channels with HDMI Input/Output | RecycledGoods.com
Surround Sound Preamp/Processors at Crutchfield
Monolith by Monoprice HTP-1 16-Channel Home Theater Processor with Dolby Atmos, DTS:X, Auro-3D, Roon Ready, and Dirac Live Bass Control Compatibility - Monoprice.com
AV Processor and Preamp Reviews | Audioholics
ODM/OEM 2020 Professional Design 16 Channels Home Theater Atmos Processor Stereo Surround Sound Pre Amplifier| | - AliExpress
Dolby Atmo Cinema Processor CP850 Line - Dolby Professional - Dolby Professional
Trinnov | 20-Channel Reference Immersive Sound AV Processor
A Surround Sound Processor for Pro AV Integration | Extron
SSP 7.1 | Extron
Denon Professional - Professional-grade Audio/Video Recording, Playback and Signal Distribution
Crestron 7.1 High-Definition Professional Surround Sound Processor-Black-HD-XSP | Sound Concepts | AR
Trinnov | 36-Channel Reference Immersive Sound AV Processor