L Audio,
I have Thiel 1.5 (predicessor to the 1.6) paired with a VAC PA90D series mono blocks (50 watts triode/ 100 watts ultralinear). I have a small room 16 x 14 and the 1.5 is 86 db with a fairly linear impedance. The VACs drive the Thiels easily. The 1.6 is more efficient but a high impedance swing around 100 hz that combined with the high output impedance of the Prologue amps might make these not a good match. You could call Kevin @ Upscale and ask his opinion. You can always try them and see how they work.
I have Thiel 1.5 (predicessor to the 1.6) paired with a VAC PA90D series mono blocks (50 watts triode/ 100 watts ultralinear). I have a small room 16 x 14 and the 1.5 is 86 db with a fairly linear impedance. The VACs drive the Thiels easily. The 1.6 is more efficient but a high impedance swing around 100 hz that combined with the high output impedance of the Prologue amps might make these not a good match. You could call Kevin @ Upscale and ask his opinion. You can always try them and see how they work.