Plinius SA-50 MKIII vs SA-103

I would think the 103 would be a step up or two or three. I used to have a 100MKIII and it was a very nice amp but over time I found it just got boring or no PRAT. I tried a BAT VK200 and found it to be more pleasing to my ears. I am not bashing Plinius at all because they are very smooth and overall very nice amps. It just didn't work in my system over a period of time. Of course mileage may vary.

I owned the SA-102 for several years and thought it was a great amp... and like Samzx12, I also owned a BAT VK 200, but IME, the Plinius sounded much better to me than the BAT amp.

I don't know this to be certain, but have read that the SA-102 & the SA-103 are nearly identical on the inside, and that the differences are largely aesthetic. With that being said, if you want to move up in power, you may want to consider the SA-102 and save yourself a few bucks.

Personally, the specs on your speakers lead me to believe they are fairly efficient, so the boost in power moving to the SA-103 is probably going to have a marginal impact. If you want to try something different, you may want to consider a moderately powered tube amp (thinking 50 to 75WPC would do the job).

The Class A capability of the Plinius amps is a big plus. They sound so much sweeter but I found that A/B mode drove my speakers better or should I say the bass was tighter. That was then and now I have a smaller integrated amp and more efficient speakers. If your speakers are efficient then Pdreher gives some good advice. Either take a smaller step up or try a tube amp or maybe a tube integrated.