SCG
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It's said that the X4800H has a shared power source for all the output channels, but I found a teardown of the unit on a japanese website, and it translates to "The AVR-X4800H is the same independent amplifier board for each channel as the AVC-X6700H and AVC-X8500HA", picture below. If the power source is shared, what are the separate amplifier boards?
Not an expert, have only built a few old amps. I think it means that they share the same electrical power source which is generally of the topology: incoming power cord, fuse, huge transformer, rectifier, filter capacitors, DC power bus. This is the source of clean DC power. Each individual board is powered by that shared bus, but amplifies a separate audio channel.
That's correct and it's why when people test multi-channels amps the power is higher testing 2 channels vs 5 channels all-channels driven. Because although all channels might have separate power amps/board, they all share the same power supply (transformer, filter caps, etc). Of course some stereo amps run full dual everything (including dual PS) and you see this more in Class D amps where the overall PS is generally smaller.
Alcoholics tested the $7,000 class D Marantz amp and it had full power all-channels driven which might be useful for Dirac ART where all channels could be driven at the same time, between the main channels and the support channels.