After hanging the new 82" TV, I lost my 1 1/2" clearance for the LCR and had to remove the short feet for the f15's but was still able to use 1/4" felt pads, and put 2 on the front edge of the 15's.
The 88 on the stand also has that "tilt" but I haven't done the geometry for that wrt how it hits my ears
I sit back 11' from all that and the horns on the 15's are usually 66 to 72" C2C depending on toe-in.
my couch feet have added machinery anti-vibration pads (big ones , like 4" x 6" x 1") (Grainger) and wooden blocks that allow for "play" with the Clarkson shakers.
So I think , if sitting up my ears are in the 40" + range that's the math.
so the hrons are about 24-25 ish from the floor, I'm not home so I would need to measure.
I test listen with a huge variety, solo voices, Big Band, select pop tunes, rocknroll, Ambient, youtube musicians, JLC concerts and have about 100 gigs of the select cuts we'd rather listen to than sit through a whole movie for, sometimes . .
I have some first side wall reflection points panels and the room is 14.5 wide.
Unless a piece is specifically ATMOS, sometimes the music and TV, in plain stereo, are actually a better sound stage with just the 15's and subs, not DSU. it depends.
For tunes like Papa was a rolling stone, you get the full psychedelic effect in stereo, : What were those guys smoking?
and for real giggles, there is a you tube remix of Billy Jean by fggkremastered where the various elements that make up the tune each get a very clear and extended play.
the snare drum starts but it's slowed down . you hear the tap and then the rest of it. awesome. . the detail is of what goes into each piece of the tune is ear candy.
you can read the wiki-pedia blurb about how Quincy Jones and Jackson went back and forth about the mix of the original. some mighty fine work there . .
just built some extended 15's to get the horns up a bit higher wrt ear level. ask him what he thinks.
I wish I had more time to just park there and listen. on the X5200 thru the ATI amp, in stereo, the MV at -15 is plenty loud, -18 is even better.