Responses from coryjb

Preamp - what's the purpose?
One day I expect I will have a combination DAC/Preamp form factor from MSB or DCS and do away with the separate pre, dac, streamer, etc.   
Streaming DAC recommendation
Can't go wrong IMO with a Lumin. I have a T3 and I really like it. I wrote a comparison here of it and the HiFi Rose 150B (streamer/DAC) if these are candidates you find interesting.     
Streamer Comparison (sort of) Lumin T3 vs. HiFi Rose RS150b
chemarcelo - glad this was helpful and I know you'll be really happy with the selection. Especially now that Lumin has upgraded the firmware to recognize the Tidal move away from MQA and to higher res FLAC. At least I was excited about it :) gold... 
How do SVS subwoofers compare to REL?
In-home trial until you can come to your own conclusion. Both companies you've mentioned will work with you on making sure you're getting what you want even if it isn't their product. I just sent back to SVS their SB-2000 in favor of an Hsu ULS-15... 
Looking to upgrade my preamp, suggestions?
Classe CP-800. Loving mine. So versatile and it gets out of the way of the music. Doesn't have a "sound", so if that's what you like it's a good investment.  
Most coherent low volume speaker with very fast bass under 10k used?
Some used or demo DeVores. A friend has the Orangutan 0/96 and they are not screaming speakers, they seem better suited for low-level listening.