Question on Plinius Amps

That was news to me that the SA-102 has been upgraded. Probably so new that media hasn't caught up. Google for reviews on the 100 mk3, 102 and 250. The SA-103 and SA-Reference operate in class A (switchable to A/B, which I call "standby") and are sonically superior.

Their A/B designs are primarily intended for HT market and run much cooler. The SA-201 is not class A. They are all powerful and can drive demanding loads.

I had both the SA-102mk2 and SA-250mk4, listened to SB-300.
The SA-102 and SA-250mk4 are very close.
If you do not need the power, don't care for the 250mk4.
It offers a little better headroom, that's all!
The SB-300 has more drive and attack than 102/250.
It has the double output devices of the 102/103, but share the same chassis aso.
This amp was made for cinema, which obviously needs more drama...
Though, it seemed that some people prefered this amp before the 102 and 250. The 103 and 301 changes are cosmetical. I would go for the Ref amp.
This amp offers more air than the 103/102/250.
The SB 301/300 still offers better drive and attack.
For the ultimate, go SB 301 for bass section and SA REF for the mid and tweeters.
The only true downside of Plinius is the high background noise. This, i could personally not stand.