I have been through a ton of DACs to find some kind of improvement in my streaming audio, I didn't notice a huge improvement with any of them really. I stream via tidal or my own flac files. If you are thinking you just have to try it, I recommend the Jolida DAC III w it has Bluetooth for streaming a pretty decent tube stage and can be had for under 600. This is the only DAC I have kept with all that I've gone through. As far as the svs subs, svs makes a pretty decent sub. I have heard really highend systems with them, as well as low end. They all had great bottom end..
My advice would be to forget about a DAC, the marrantz has a built in dac, and is a pretty good preamp, specially in the Atmos category. I build a budget 9.2 theather for a friend useing that preamp and all elac ub5s for rears, fronts surrounds and atmos, McIntosh amps and 2 velodyne subs and it sounds quite good.
My advice would be to forget about a DAC, the marrantz has a built in dac, and is a pretty good preamp, specially in the Atmos category. I build a budget 9.2 theather for a friend useing that preamp and all elac ub5s for rears, fronts surrounds and atmos, McIntosh amps and 2 velodyne subs and it sounds quite good.