Yamaha, my preferred brand, with Silent Cinema headphone surround sound
The RX-V657 comes with Dolby Digital and DTS
Just run S/PDIF (optical or coaxial) from your Xbox and PC to the Yamaha.
Make sure your xBox and PC are set to S/PDIF 5.1 (or 6-channel) output.
Would need to have enable DDL (Dolby Digital live) or DTS-connect, on the XBox or PC, which ever they use.