Probably I did not make it clear enough. When I used Marantz for comparison, Boss2 is not added to the chain.Sure, anytime.
Marantz has its own DAC, so while playing with Allo Boss2 it might be going through 2 conversions, Allos Dac and Marantz Dac hence degrading the sound quality. Pure direct mode solves this to some extent but not all.
How are you controlling the volume wen directly connected to crowns? Try adding a pre amp stage between the Allo and Crowns to get more out of it.
Test 1 setup:
FLAC on the NAS >>>>Marantz>>>XLS2002>>FS Speakers
Test 2 setup:
FLAC on the NAS >>>>BOSS2>>>XLS2002>>FS Speakers
I am controlling the volume on Crown. But I do have plans to use Shaan's PeeCeeBee Preamp. Just waiting for a nice chassis for it.