Class H amps?

Just came across 'Class D' (after years of A, AB, not really B).

So what is Class H? How does it differ from Class D?

kraftwerkturbo02-22-2023 6:52pm

innersound300 Details Discussions Posts This discussion Message User 18 posts 02-22-2023 at 09:17pm Copy Comment URL Report Comment Edit Delete https://www.youtube.com/watch?v=Zl0vP62WpLI
erik_squires Details Discussions Posts This discussion Message User 16,060 posts 02-23-2023 at 01:12am Copy Comment URL Report Comment Edit Delete The output transformers are valves between 2 voltage rails. Say, + and - 10 V. In A, B and A/B those rails are fixed values. Classes G and H vary those rail voltages. Carver and NAD got famous on G. The idea is that minimizing the difference between the rails and raising them only when needed minimizes heat of the output transistors. NAD continues to dabble with their hybrid Class D amps today. Wikipedia is your friend:
mrmb Details Discussions Posts This discussion Message User 299 posts 02-24-2023 at 05:19am Copy Comment URL Report Comment Edit Delete As an aside, an audio buddy is using a pair of Benchmark AHB2 Power Amplifiers to drive his SoundLab electrostatic speakers to great effect. Benchmark's specs state it: “combines class-AB, and class-H topologies, using a feed-forward error correction system” (https://benchmarkmedia.com/products/benchmark-ahb2-power-amplifier). My buddy is using two AHB-2’s that are in bridged mode to output enough power for his SoundLabs.