1) A solid state amp that doubles output as speaker impedance is halved is a necessity for the Thiel speakers. MAYBE a Wolcott tube amp would work...maybe.
2) Impedance matching between preamp and amp is critical. The BAT preamp has a fairly high output impedance that limits the number of solid state amps that will match properly. Obviously, a BAT solid state amp would work well.
3) The same requirements as stated in point number 1 above apply to any integrated amp being considered. You can cross tube integrated amps off your list.
The direct answer to your question is that the amp is most important in the respect that it must match properly with your speakers. No preamp will fix a poor amp/speaker match. Next, once you have a good amp/speaker match, the preamp must match the amp in respect to impedance. A marginal impedance match between the preamp and amp will result in rolled off bass and possibly rolled off highs...despite an excellent amp/speaker match.
Bottom line...I'd recommend a good solid state integrated amplifier that doubles output as speaker impedance is halved: Pass Labs, Gryphon, Bryston...maybe even a Portal Audio Panache.
2) Impedance matching between preamp and amp is critical. The BAT preamp has a fairly high output impedance that limits the number of solid state amps that will match properly. Obviously, a BAT solid state amp would work well.
3) The same requirements as stated in point number 1 above apply to any integrated amp being considered. You can cross tube integrated amps off your list.
The direct answer to your question is that the amp is most important in the respect that it must match properly with your speakers. No preamp will fix a poor amp/speaker match. Next, once you have a good amp/speaker match, the preamp must match the amp in respect to impedance. A marginal impedance match between the preamp and amp will result in rolled off bass and possibly rolled off highs...despite an excellent amp/speaker match.
Bottom line...I'd recommend a good solid state integrated amplifier that doubles output as speaker impedance is halved: Pass Labs, Gryphon, Bryston...maybe even a Portal Audio Panache.