I have the same Onkyo for HT. It is good to get by with for 2 channel stereo, depending on what your standards are. However, it's definitely leagues away from audiophile standards and I'm not trying to sound snobbish.
Since I see you have Vienna Acoustics speakers I think in the longer run you do want upgrade to at least something like a small integrated amp. That would bring the quality up by a substantial margin.
Since I see you have Vienna Acoustics speakers I think in the longer run you do want upgrade to at least something like a small integrated amp. That would bring the quality up by a substantial margin.