Originally Posted by Mystic1
Sorry - been working on other things.
OK, you're planning for 6 displays of equal capabilities (so no 3D unless all have 3D). On these 6 displays you will have 4 different input sources. To make things more interesting two of the displays are between 30 and 50 feet of HDMI cable away from the switcher.
You're right, a 4x8 matrix would be your best bet, which is not cheap. What makes it worse is that if you wanted, in the future, to go to 3D or 4K on a single TV, you would have to throw away the matrix switcher to get there.
The only thing in your favor is that since the TVs all have the same capability (I'm assuming the same HDMI revision number or close), then you don't need EDID spoofing.
I can't see anything that gets you out of 4 inputs for the matrix switcher. However, if you used a 1x4 HDMI distribution amp on one of the matrix switcher outputs, you *may* be able to limit yourself to a 4x4 matrix. Again, this assumes very similar capabilities between the monitors. Unfortunately the only way to find out would be to try it.
I use a very cheap ACCELL distribution amp I found at Fry's to feed a computer output to an Octava matrix and a computer display and it is reliable. This is backwards of what you want, but it shows it can be done. Just make sure you have a good return policy where ever you purchase, since this is under the "complex" category of HDMI.
As far as distance is concerned, you'll probably work OK at 1080p/60 as long as the 50' cables are good quality (not high price but good quality) - 24 awg or so. If you want to be absolutely sure, look for a matrix switcher than also converts to Cat 5e/6 cable. It should be easy to find a few 4x4 matrix switchers that also convert.