First off, I've read other posts related to this, but can't quite seem to find a definite answer to my question.

I've got a roughly 15m run (maybe a bit less) of component cable from my receiver to projector, and am now thinking of adding an HDMI run to this.  Due to the distance, I'm steering clear of a single bulky HDMI cable, as I wouldn't be able to feed or bend it through the walls, so am looking at doing HDMI over Cat5/6 instead.

What's confusing me though, is that of the various baluns that seem to be available, there are some that state they are passive only (e.g. this one), and others that are active powered ones (e.g. this one).  I've enquired with Ascent who also list the same powered one, and they have advised that the powered one requires power at both ends, however the descrption on the PBTech website supplied says "Power source: DC 5V (does not need generally)".  Yet another one from Jaycar (here), says "Power requirement...at sender end".

The RapalloAV Grandbeing ones are tempting because of their compact size, but as someone else mentioned on another post, they might put a bit of strain on the HDMI connector, but that might also just be dependent on how the Cat5/6 cables come out of it, I guess.  Another big plus though, is that you don't need additional HDMI cables.

What I'm wondering though is whether or not the powered ones, will actually still work, without the power connected (so it becomes a passive balun), or perhaps with the power only in the sender end instead of both sender and receiver ends?  At what distance when using baluns is additional power essential?

Since my projector's ceiling mounted, I don't really want to have a power adapter block hanging from the ceiling mounted socket (which would have to be upgraded from the current single to a double one, anyway).  A standard plug is one thing, but the extra weight of an adapter, especially if it's a big one, might make the thing fall out?!

HDMI-Cat5/6 wall plates that others have used aren't really an option for me, due to where the cables are coming through the wall, and the distance to where the projector is.

Finally, is it worth keeping the component cable connected too, as an alternative signal option, or will the HDMI suffice (my receiver (Denon AVR-2308) can convert all other video formats to HDMI)?  Have others ever found a case when a signal won't go over HDMI, and have had to use component instead?

Sorry for the long post, but hopefully it helps explain my situation and thoughts clearly!  All advice appreciated.

Thanks,

Simon.