"I was following the whole firmware update in the 805 thread when it became available through unofficial sources. The consensus was that it did nothing to help the lip sync issue. So I never bothered. Email from Onkyo confirmed it's hardware related, too many DSP's in the signal path and each one adds it's own delay. Unfortunately no firmware update could ever fix that. If you've really got your heart set on the 875 then buy it where you can exchange it for the 3808 if things go awry."
I don't know if this is true or not, as I didn't follow the firmware thread that closely.
“An engineer explained to us that hundreds of ear impressions were gathered in the name of research, and while each one obviously boasted its own unique shape and size, one single characteristic remained uniform across the board: the entrance into the ear canal is not a perfect circle, it's an oval.”
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I was under the impression that the firmware updates could not fix the delay, as it's based on the speed of the processing chips.
http://www.avsforum.com/avs-vb/showthread.php?p=14244487#post14244487
"I was following the whole firmware update in the 805 thread when it became available through unofficial sources. The consensus was that it did nothing to help the lip sync issue. So I never bothered. Email from Onkyo confirmed it's hardware related, too many DSP's in the signal path and each one adds it's own delay. Unfortunately no firmware update could ever fix that. If you've really got your heart set on the 875 then buy it where you can exchange it for the 3808 if things go awry."
I don't know if this is true or not, as I didn't follow the firmware thread that closely.