Yamaha made a very good one in the late 90s that allowed RF, TOSLink and S/PDIF inputs with 5.1 RCA outputs. The model number does not come to mind but I owned one in 1996-1999 and remember its performance very fondly. It did DD 5.1 and Dolby Pro-Logic; I do not know if it did DTS.
You might have to get one that also includes a preamp also. I bought a B&K Reference 20 and it looks and sounds well. You might have to go to the 30 to get DPII.
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