SUGDEN MASTERCLASS FPA-4 Class A amp

I really wish I could answer that--I was looking into it myself earlier this year.  Depending on where you are you might be able to audition their A21 integrated and get a taste of their sound. Tone Imports is the distributor, but I don't think many carry their separates in the states. I did find a magazine review that mostly loved the clarity and purity of tone, but found the power lacking (measurements were something like 23 watts @ 8ohm & 28 @ 4).  And as Stereophile measurements show the MA 300 to be more like 87db efficiency instead of 90db, it's probably not a great match for larger rooms or louder volumes.

FWIW I ended buying a used First Watt M2. If I could upgrade every piece of my system but one, that'd be what I kept.  I haven't dealt with them, but Reno Hifi sells Pass Labs & First Watt online, and do allow for home auditions.  They could probably also best direct you to the model that would best match your speakers & taste.

I have heard it on the Wilson Benesch Vector and it sounded great. An excellent match. I have also heard it on the ProAc Response D-40r. Also a great match. Very neutral and pure in tone. Excellent bass drive particularly on the Vector.

gnostalgick and Jperry,

Thanks a lot your opinions.
Monitor Audio matches very well low power amps, specially Class A.
I hope the soundstage would be nice.

Thanks again!