Cambridge Audio Azur 751R V2 AV Receiver (Black) Flagship 4k compatible receiver. High-quality components to ensure optimum sonics Comprehensive upscaling and upsampling capabilities 7.1 outputs (with option to run twin subs) 2 Texas Instruments 32-bit DSPs to support a broad range of surround formats and speaker layouts Handles Dolby Digital, DTS, Dolby Pro Logic II/x/z, Dolby True HD, Dolby Digital Plus, DTS-HD Master Audio, DTS-HD High Resolution Audio, and more