abacus said:
The Pioneers also have an 11.2 pre-out which allows an additional amplifier to be used,just like the Marantz.
Not according to this review of the flagship model:
http://www.homecinemachoice.com/news/article/pioneer-sc-lx88-review/20597
"For those looking to be so much at the cutting-edge of AV tech that they're constantly putting plasters on their fingertips, the headline feature here is Dolby Atmos processing. But, hang on! As a 9.2-channel amplifier the Pioneer can only drive nine of the speakers in an Atmos system – 5.1.4 or 7.1.2 are both possible natively.
Now, you would have thought an add-on stereo amp might bag you a full-fat 7.1.4 Atmos system via the Pioneer's 11.2 channel pre-outs. Alas not. The brand says the SC-LX88 only has the capability for 9-channel ‘processing,’ meaning this is rather more skinny than the full-fat we hoped for.
That will leave some of you in a bit of a dilemma – mainly those already with a traditional 7.1 array and a desire to add four height speakers. Do you instead go 7.1.2 or 5.1.4? I auditioned the latter – having gone through all sorts of domestic upheaval to fit four ceiling speakers, I was damn well going to use them – and discovered it makes Atmos really come alive, even if there is something of a hole in the soundstage behind the sofa with rear-backs missing.
For that fully-fledged Atmos experience, an alternative is to check out a rival model at around the same price point. Yamaha, for instance, assures us that its RX-A3040 will provide 7.1.4 Atmos using its nine channels plus an additional stereo amp."
I've done a lot of research on every single receiver in the market before buying the Marantz. This is the only reason for me to not consider the Pioneer.