Originally Posted by tigerninety
Thanks for the suggestion, it's a good one, and I might find a way to try it.
The HDMI cable IS long, but it's not going to get any shorter, permanently: it's running through my wall and ceiling. I _did_ buy a (supposedly) special cable designed for longer runs from Monoprice; it sends signal in only one direction as a result. Don't know if that makes a difference one way or the other (no pun intended).
The PS3 works fine playing blurays, as does my Verizon box (connected via HDMI). So (given that the PS3 works fine, anyway), I'm still thinking that the problem lies more specifically with the AppleTV connection via the Onkyo. Would you agree?
Don't really know your entire system/setup..
However early AVRs with HDMI repeaters had limited compatibility with HDMI cables, max run was about 15'. However later AVRs w/HDMI repeaters, the Silicon Image HDMI chip includes a buffer/EQ stage that helped to restore/compensate for longer HDMI cable runs. In our AV installs, for certain systems we have used a wireless 2.4GHz Tx/Rx HDMI combo with positive results, though this active system is significantly more $..
Regarding where the problem or blame lies..
Since we have been doing AV installs for many years, analog days, early HDMI and later... My opinion is that here one has to be very, very careful when mixing older Legacy components be it analog or HDMI with later HDMI products. For example, we just updated an AV system we did 6 years ago @ a cost of about $7500. The AVR failed, and the customer wanted to ADD a new AVR, blu-ray player, ATT Universe and Apple TV, but his most expensive investment was a $4K Pioneer Kuro plasma display. The Pioneer display worked great and the customer wanted to keep and use it. We installed/connected via HDMI a Yamaha AVR, Panasonic blu-ray, ATT Universe and Apple TV through the AVR and ran the HDMI Out to the Pioneer, here everything worked fine including the older Pioneer display. Fortunately we have alot of experience with various brands for their HDMI interoperability in our other business doing alot of support/product evaluation/new product development work for some of the primary AVR brands.IMHO..
The biggest drawback today is that many CE brands crank out multiple components w/HDMI but either bypass entirely the HDMI certification process and/or have inadequate
internal testing procedures in place.. Connecting an HDMI source component directly to an HDMI display has significantly less compatibility issues, compared to connecting through an AVR with an HDMI repeater.
Just my $0.02... 👍😉