I'm curious about your opinions................
I'm going to get a big sealed stuffed box built (golden ratios), think 36" tall x 22" wide x 14" deep.
I would like to get the full range driver to be higher off the ground, as these will be used for low volume movies maybe 1/5 of the time.
I measured my ears @ around 42-43" off the floor and the middle of the TV is near 40".
I see the seas f8 exotic article on TNT had the (expensive) driver right at the top in a 40.8” tall x 9.96” wide x 11.22” deep sealed box (basically a sealed pipe to me) ................
"........Going back to my own Dynaudio Contour 1.8 mk2 speakers after a while was a shocking experience. Their bass sounds quite boxy and over the top compared to the SEAS............"
https://www.tnt-audio.com/casse/seas_exotic_e.html
Whatcha think ?
I'm going to get a big sealed stuffed box built (golden ratios), think 36" tall x 22" wide x 14" deep.
I would like to get the full range driver to be higher off the ground, as these will be used for low volume movies maybe 1/5 of the time.
I measured my ears @ around 42-43" off the floor and the middle of the TV is near 40".
I see the seas f8 exotic article on TNT had the (expensive) driver right at the top in a 40.8” tall x 9.96” wide x 11.22” deep sealed box (basically a sealed pipe to me) ................
"........Going back to my own Dynaudio Contour 1.8 mk2 speakers after a while was a shocking experience. Their bass sounds quite boxy and over the top compared to the SEAS............"
https://www.tnt-audio.com/casse/seas_exotic_e.html
Whatcha think ?
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Generally it's a bad idea to mount drivers with same disrance to three edges (baffle diffraction effects add up). Depending on directivity of your driver that may not be a big issue, though.
Assuming movie use only, then all other things being equal, I'd aim to get the driver height equivalent to about 2/3 - 3/4 the screen height, since if we're being really finnicky, that tends to be where a majority of pictured head-heights & therefore (in theory 😉 ) dialogue tends to come from. In practice it's not likely to make a whole lot of difference since 99% of us have TVs with built-in speakers or whatever which don't position them that way & they're fine for casual viewing. Still, if you can -why not.
Otherwise, as noted above, try to avoid symmetry on all three planes, although especially with larger wideband units, they're usually too directional to be as significantly affected by diffraction as some others. Per above though -if you can, you might as well, since it doesn't cost anything. I'd probably try to avoid having it in immediate proximity to the top of the baffle if you can too, although that's as much about reducing internal standing waves or the amount of damping you'd need to suppress them (assuming it's not already heavily damped by design) as external baffle effects. Still, the latter may have an effect since it's in such close proximity to the driver, & for want of a better phrase, the 'launch platform' for the expanding spherical pressure wave immediately collapses at a relatively high frequency, which isn't likely to be ideal.
Otherwise, as noted above, try to avoid symmetry on all three planes, although especially with larger wideband units, they're usually too directional to be as significantly affected by diffraction as some others. Per above though -if you can, you might as well, since it doesn't cost anything. I'd probably try to avoid having it in immediate proximity to the top of the baffle if you can too, although that's as much about reducing internal standing waves or the amount of damping you'd need to suppress them (assuming it's not already heavily damped by design) as external baffle effects. Still, the latter may have an effect since it's in such close proximity to the driver, & for want of a better phrase, the 'launch platform' for the expanding spherical pressure wave immediately collapses at a relatively high frequency, which isn't likely to be ideal.
Interesting! Only ever seen the 2/3, but haven't been to a cinema since early 2k, though have noticed while watching a lot of later Sci Fi on my 16:9 that they appear cropped to me, implying modern movies are standard in even wider aspect ratios at up to 3/4, so are they actually formatted this way now?
Flattest response would be to the top.
Although the driver has a rising response regardless.
Centered on the baffle would create 2 equal edges and not be considered flat
would require additional offset. Almost non issue with wider baffle in this case.
Reducing fractional data makes things easy and 3 decimal points for 1.618
Doesn't make things easy for quick examples.
Golden ratio for nice even numbers is related to Fibonacci sequence
Ironically 22 and 36 not in the sequence would produce numerous errors.
But enough of that.
Not all the numbers will create a flat response for offset, so not all numbers
related to the ratio means " pure magic"
But following the behavior of diffraction and even testing a golden ratio baffle.
The flattest response will ironically fall to the ratio. But not all positions related to the ratio will.
This case simplified with errors 22 x 36 baffle
36
22
14
8
5
3
Thumbnails click to enlarge
Flattest diffraction response on that baffle driver center simple falls 8 inches over 5 inches down
As opposed to the lower option
And simplified sequence with less error
34
21
13
8
5
3
Although the driver has a rising response regardless.
Centered on the baffle would create 2 equal edges and not be considered flat
would require additional offset. Almost non issue with wider baffle in this case.
Reducing fractional data makes things easy and 3 decimal points for 1.618
Doesn't make things easy for quick examples.
Golden ratio for nice even numbers is related to Fibonacci sequence
Ironically 22 and 36 not in the sequence would produce numerous errors.
But enough of that.
Not all the numbers will create a flat response for offset, so not all numbers
related to the ratio means " pure magic"
But following the behavior of diffraction and even testing a golden ratio baffle.
The flattest response will ironically fall to the ratio. But not all positions related to the ratio will.
This case simplified with errors 22 x 36 baffle
36
22
14
8
5
3
Thumbnails click to enlarge
Flattest diffraction response on that baffle driver center simple falls 8 inches over 5 inches down
As opposed to the lower option
And simplified sequence with less error
34
21
13
8
5
3
Yeah, IIRC a few of them have been shifting to the higher aspect ratios.* 2/3 screen height still seems to be the good average, but 'in case of need' somewhere between that & 3/4 should help cover that base too 'just in case' 😉
* A girl I know up in Edinburgh bought a 49in Phillips curved monitor for no reason other than she thinks it's about as near as she's likely to get to seeing 2001: A Space Odyssey in the original Super Panavison 70 format with it set up about 5ft away in her flat. She might have a point... 😉