new GAN amplifier

There’s a Supertramp track, that fit’s this claim of "doing a nice job" of that amp driving the Wilson Alexia’s, it’s called "DREAMER"

With serious lack of damping factor, and far less current than an 80’s NAD 3020 integrated can give.
This thing on the Wilson Alexia’s would become the worlds most expensive monoblock tone control, in the worst possible way.
Might work if it just drove the mids and highs.
https://www.stereophile.com/images/1213Walexfig01.jpg

Hypex ncore nc1200 doubles the output at 2 ohm. Georgehifi builds the Lightspeed Attenuator that measures poorly but sounds decent. He has this obsession of GANs that have one metric pumped up, cost more, but do not perform better than ncores or Purifi. Getting into technicals with him is a waste of time, because he then inundates with irrelevant links and/or retreats to subjectivist positions. " Many, me included, prefer scotch to bourbon".

GaN are faster and present lower drive capacitance which theoretically allows for a higher switching frequency - which has encouraged many people including George. However, regardless of power device used efficiency is always inversely proportional to switching frequency.  Class D will get a bit better but will never quite be able to outperform the best traditional linear class A / AB designs above about 5kHz. However, in terms of bang-for-buck they are increasingly hard to beat as full range amplifiers and the best on offer are close to absolute best below about 500Hz. As was pointed out they don't have problems driving highly reactive loads - apart from treble range and up due to output filter interactions. 

In my current setup I'm using hypex NC500 amplifiers to power my woofers and an ultra LD class AB amplifier for mids / tweeters. A best of both worlds implementation.