With that ribbon tweeter, I'd go for a warmer amp. Parasound A21 perhaps?
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My new Monitor Audio Gold 200 5g speakers (latest generation) use MPD (micro pleated diaphragm) high frequency transducer, kinda similar to the ribbon tweeter but not a ribbon tweeter. The same kind of MPD tweeter used in the MA Platinum series ll (latest gen). The previous generations of the MA Gold series 4g use ribbon tweeters. The latest gen of Gold series 5g shares the same DNA & technology (trickle down technology) with the latest gen of Platinum series ll.
So my MA Gold 200 5g (latest generation) are warmish sounding speakers, very smooth very refined, and definitely sounding much more laid back, much smoother and warmer sounding than the previous Gold series 4g, which I found to be bright. The current latest version of Gold series 5g sound very different from their prodecessors. They are complete opposite as far as tonality.
That said, I’ve heard from some that the SST Son of Ampzilla ii is slightly warm sounding amp. I’ve never heard the Parasound Halo A21 before.
Didn't we have this same post in November? It's a fine AB amp, inexpensive, owners like it (I do), the reviewers like it. Unlikely anyone will be able to comment on it vs the Sigma or with your particular speakers, that's a needle in a haystack. Talk to Walter at Underwood, he will have the most info, not sure if he has anything to demo, that's the challenge with smaller brands with limited distribution.