Shahinian Obelisk vs VandersteenTreo

HP units are worth keeping they will sound just a bit cleaner then built ins
If you Just use the Vandersteen XLR Battery Bias HP filters switched to 3/5 into the top Atlas XLR inputs you may not need anything else anymore.
 Best JohnnyR

@audioconnection 
As a matter of fact I was planning to use the DAC straight into the amp.  My HPFs are RCA, rest of the setup is balanced, wanted to put them away. No point in buying another set of HPFs.

(((I also hope there is a section in the Atlas manual for setting the HPF for Vandees)))

 When hooking up the Atlas both channels are a mirror image of each other.
Speaker binding posts Positive and Negative are in reversed positions on the back of amp look closely at what you are doing with + - and you will be fine.
As for the interconnects if you are going to use the Atlas internal High Pass install your interconnects to the lower available inputs, keeping the amp in mute touching the right side of the black rectangle display window located on front center of amp allows selecting on proper inputs chose accordingly input 2 either SE for RCA or input 2 Bal XLR and then Set Crossover to 100 by adjusting display window and lock and your set.
 Best JohnnyR

@audioconnection ,
Johnny, kudos to you. Thanks for all your time and effort.
I only really needed the info on the lower inputs and crossover frequency setting, but your input is really commendable. Thanks A LOT.
I am picking the amp up today in ... Prague :-)  Great reason for a fun trip with my better half. The beer is fabulous and the pork knuckles are fantastic... as always. 

Got the Aesthetix playing finally.  Sweeeeeet! ;-)