Strange if you can not hear it from a distance but from closeby?
Are you sure you are just not listening to close to the tweeter and hearing those high frequencies?
I actually have a setup where my Ultra is connected to an external DAC via SPDIF, and the sound is a bit "harsher" compared to the built in DAC in my Active Speakers, but on the other hand I gain a lot of extra control and a Sub-Out so still using it