Too many are gone, but golden-era Infinity and Krell are at the top of the missed list.
Of the ones reputed dead, Crown is very much alive. So is Genesis, for better or for worse.
Gone but not forgotten
What HiFi makers that are now out of business do you miss? Personally, I can think of 2 brands that made great gear and are gone and that I miss - Nakamichi is one- and that was inevitable as the cassette world virtually disappeared. The other was California Audio Labs- I thought they made genuinely good digital gear.