Legacy Audio i.Vx where x = number of channels up to eight.
https://www.dagogo.com/legacy-audio-v4-ultra-multi-channel-amplifier-review/
“The i.V Ultra amplifier has handily outdone all other amps reviewed, regardless of genre, which is unprecedented. I invite the community to peruse the entire listing of amps I have reviewed from the past 14 years; there is not a one of them, not a single one, that I would prefer to be hearing. It’s not just a matter of being somewhat better, or in some respects having advantage, but rather a wholesale superior experience.”
https://www.dagogo.com/legacy-audio-v4-ultra-multi-channel-amplifier-review/
“The i.V Ultra amplifier has handily outdone all other amps reviewed, regardless of genre, which is unprecedented. I invite the community to peruse the entire listing of amps I have reviewed from the past 14 years; there is not a one of them, not a single one, that I would prefer to be hearing. It’s not just a matter of being somewhat better, or in some respects having advantage, but rather a wholesale superior experience.”