I'm not entirely clear on the differences between the AV8801 and AV7701. The only differences of note I could find are:
- toroidal vs. EI power transformer
- 11.2 vs. 7.2 channel support
- MultiEQ XT32 vs MultiEQ XT
- 3x ADSP21487 DSP chips vs. 1x (for MultiEQ + sound fields?)
(For some reason the AV7701 is also listed with much higher power consumption but maybe that's a typo.)
Of those, I suspect the power transformer and MultiEQ XT32 are the biggest benefits of the AV8801. I don't use sound fields so either the 3x DSP chips doesn't matter to me or it's because of the XT32.
I currently have an AV8003 because its sound quality is noticeably superior. I'm wondering if it makes sense to upgrade to the AV8801 sometime in the near future (around when I grab a 4K or 3D projector). The AV7005 did not appear to be a product that would improve on the AV8003 despite coming out later, and I was wondering why Marantz was lacking a new high-end processor.