Sometimes it's hard to isolate one variable. Having HFT's placed front,back , side ,and ceiling with the Atmosphere does definitely change the sound field. That being said, the biggest change has been changing over to the Audio Horiziong premium fuses in my DAC, preamp and amp . The system has changed dramatically with this change. The AH fuses replaced both the SR reds and blacks in the above mentioned components.
HFTs or more fuses
I just put Synergistic Reds in my DAC and pre. My retirement budget only allows for my next purchase to be either Synergistic Blacks for my monoblocks or the HFTs for my room, not both. Can someone tell me, from their experience, which acquisition made the bigger improvement in their system?