Stereophile review of SU-R1000 "amp's bottomless noisefloor" is a good description of the SU-G700 as well. I never heard the SU-G30 though I assume same analogy applies
GaN based SU-R1000 Technics Integrated Class-D, review by TAS
After their unobtainable and unaffordable ground breaking 1.5mhz switching speed, Technics SE-R1 GaN Class-D power amp, this new offspring integrated has finally gotten an in depth review.
I had high hopes for Technics "fully optioned" SU-R1000 integrated, "looks" like my hopes could be founded, here is the The Absolute Sound’s 7 page!!! review on it, enjoy.
https://www.theabsolutesound.com/articles/technics-su-r1000-integrated-amplifier?mc_cid=2c9d21110f&a...
Cheers George