99% of HT receivers were already capable of playback at 24/192 anyways, so it's not really a new feature.
Just going based off bench tests from AH and sound and vision, it seems denon and Yamaha are probably the worst offenders as far as lousy amp performance, I have yet to see an onkyo fail to meet its specifies rating, even in multichannel tests within 80%, but then again, they dropped audyssey in favor of their disastrous accueq, allowing them to use less powerful processing chips (both atmos and audyssey are fairly taxing).
I don't know if atmos is the cause of lousier power supplies, receivers have been going downhill way before atmos.
The major gripe I have is $2k+ flagship receivers showing crappy bench results on the amp section, that's just inexcusable. Makes you wonder where that extra cash is going, i highly doubt a few more transistors, preouts, inputs etc. for 9.1 vs 7.1 justifies an extra $1200 if the amp section isn't getting a significant upgrade. It's not that manufacturers can't get decent performance with 9-11 channels.
Either way, I personally feel atmos is about as big of an improvement as discrete 5.1. Object based audio that can move along 3 dimensions just sounds so much more realistic than 5.1 or 7.1, and much of the attempt to matrix height channels (PLIIz and Neo X) suck in comparison to the real thing.
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