While yes the Sierras can run with the 1.2 or the 2.2 t-path amps. it's too insensitive of a speaker for the T-Path amps, the Sierras are POWERHOGS needing all the power you can feed them. I have both the sierras and the 170SE. The 170SE's sound worlds, I mean WORLDS better with the T-path amps than running the Sierras off the T-path amps. The combination of the 170se's and the 1.2 is a wonderful and very special sounding setup, sounding focused, nuanced, tight, with amazing dampening and surprisingly full bass response. The Sierra running off the 1.2 or the 2.2 sounds almost muffled and unfocused in comparison.