Originally Posted by deadrick
Guys, just doing up my HT in my living room and seeking your suggestions where do my Top Rear speakers go to?
For the Top front, i will be placing at the top front position.
But for the Top rear, im thinking 3 different locations, the furthest back should be consider as Rear height instead of Top Rear.
What do you guys think?
Well... There's three approaches here and you seem to have chosen them all and probably for good reason.
With 5.1.4, you might want to have the rear tops close to inline with the surround speakers so they mesh well. 100 degree angle makes sense there, but that's would really be "top middle" in the renderer. I can actually play movies in this EXACT configuration here (I just disable my rear surrounds and rear heights and to be exact turn off my matrixed speakers as well, but that's all easy to do without even getting up from my programmable remote). If you label the speakers "heights", it actually works great for Auro-3D as well since Auro-3D really is just heights added to a 5.1 layout. They have the speakers on the side walls, but I'm not sure how important that really is in practice as my top middles are on the sides and they blend just fine for Atmos so why wouldn't they blend the other way around with mixed audio? Recorded audio I can see where there might be a slight issue for precision, but mixed? It's all off-screen so you'd never really notice, IMO especially without a comparison. In any case, this configuration sounds pretty good here for one row of seats. You have the surrounds in the correct position as well (100 degrees gives decent side and rear fill, IMO).
Now the 125 degree position is a good rear tops position and would kick up the overhead spread a notch, but you might feel like you're missing something without rear surrounds back there. Actually, that's an Auro-3D option as well. For multiple rows, surely it's an improvement, but for one row, I'd probably stick with the 100 degree position.
At the 150 degree position, you're basically doing rear heights. On the plus, it matches with the front angle, giving a nice even spread. At 5 meters, however, I think you'd be spreading the center line imaging pretty thin and you'd benefit from a top middle being there as well.
Thus, limiting it to only 5.1.4, I'd go with the 100 degree position and label it Top Middle (if your AVR allows that). You'd then of course have the option to add rear surrounds and rear tops/heights in the future if so desired with your work already done for the top middle position.
However, there's one little possible issue. How high is that "cabinet" behind the sofa? Are you putting the surrounds on top of this cabinet? Do they end up much above ear height?