Hot off the press...I had a feeling when I got this amp and heard it (and its siblings) that formal reviews like this would follow...
https://www.dagogo.com/legacy-audio-...lifier-review/
A couple excerpts...
"This leads to a bombshell: The i.V4 Ultra outperforms even the 157-pound, $42K Pass Labs XA200.8 Mono Block Amplifiers that I lauded only months ago at 30 pounds (heavy for class D).
This is not a hit job on Pass Laboratories but on all other classes of amps! Actually, not a hit, but an announcement of a memorial service. These others are dying, and I have attempted to warn some more than once. I personally discussed with Nelson the urgency of moving into class D, telling him that I know of no other designer that could do justice, who would be so capable of exploring that genre of amplification. Nelson is an eminently polite man, and was very considerate as he brushed aside my recommendation."
"The next point I am going to make will sound contradictory and, in the minds of some, impossible. The i.V4 Ultra not only has exquisite detail, it is also exquisitely and tonally pure. It brings a sense of the ideal to each voice's and instrument's tone and reduces the incidents of sharpness in some notes that other amps project. How can a switching amp do this? I don't know how, but it is surprising when class A or A/B solid state amps like the XA200.8 and the EX-M1+ sound rougher and less pure."