I find the QSA treatment to impart a greater tonal density in the presentation.
I do too, reflected in greater clarity and preciseness, at least with the Gamma Infinity power cord. After listening to the latter and the XLR's, I'm wondering if there is otherwise a "QSA sound" tonally that's imparted by the process, or if the character of the base cable is maintained, but just refined.
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Living room: Lampizator Golden Gate 2/3 single-ended dac w/ VC, Engine 11-P upgrade (Poseidon), TP tube adapters & ground cables; VAC Master preamp; Ric Schulz modified Oppo 203 (digital only); ATC SCM 5OASLT active speakers & JL Audio e-110 subs on custom pedestals & Gaia I & II feet; Wyred Pro Stream Power Conditioner & PS Audio P15 Regenerator w/ PowerBase; WyWires Diamond power cords and ICs; Purist Audio Design Neptune S/PDIF & HDMI cables; AV Roomservice EVPs & Graphite Audio Premium Isolation Cones; iFi S/PDIF iPurifier w/ Paul Hynes SR4 LPS; Swiss Digital Fuse Boxes (3) w/ Extreme Piggy power cords & graphene/brass sluggos, QSA Red & Red-Black fuses; Russ Andrews plug-in RF Router and grounding cables, Gutwire Ultimate Ground cable, Furutech GTX-D outlet; and Nordost QK1 & QV2 (x2) & QSine, and Puron AC Line Conditioners; LG C1 HDTV with Tii-220 cable filter; Audioquest Vodka 48 HDMI cable; High Fidelity magnetic adapters and NPS-Q45T/NPS-1260 contact enhancers. ASC bass traps.
Desktop: Quad 12L active speakers, WyWires Platinum ICs, PS Audio AC-12 power cords, SR Black fuses.