Plinius SA301 Or Bryston 4bsst2?

Either amp will drive the speaker so I would just listen to both amps and pick the one that sounds the best.

I assume you meant the Plinius SB-301? If so, I owned that amp and it is very nice. Just a bit rolled off on the top and a bass beast. If you are looking to tame the Thiel's top end, it would be a good choice. Plus John Atkinson's Stereophile measurements of your speakers show an impedance dip to 2.7 ohms - the SB-301 is claimed to be stable to 2 ohms, so no issues there.

Jonchew-

as a THiel lover myself, you will want the power amp, that also, has high-current to drive them properly.

A tubed power amp, will be another matter. Over the years, I have had the pleasure of auditioning ARC, Ayre, Aesthetix, Bryston, Classe' and Pass Labs (currenrly the best SS at this time). Do not forget older solid-state power amps like Parasound and Threshold.

Lately, Conrad Johnson owners state that these components are a sonic match for Thiel as well.

As anyone can read, there are many, many power amps that will drive those speakers to Audio nirvana. Keep me posted & Happy Listening! JA

Which amp is more details and quieter as I am unable to compare side by side due to dealer don't carried these two amplifiers together. Thanks.

Yeah, that's a tough one. Is the
Plinius Class A?