? But that paper discuss exactly Allison and JBL designs!?
It is not very specific, because there are only 3 possible speaker placements in the room: on the wall, in the wall/ceiling and away from the walls.
? Allison design is strictly domestic hi-fi loudspeaker. JBL design discussed in the paper is for commercial sound reinforcement, but exactly the same design Infinity is using for domestic surround loudspeaker.
True, but that has nothing with the loudspeaker design at all.
My English is not good enough, so I might not understood you correctly. (I still don't understand the bolded part above.)
We could happily fill the whole forum with pages and pages if we went on like this. So let's better stop. It's not worth the effort.
This thread has gone so far off track, and branched into so many sub topics, I don't think you need to worry about it...
The D&D speakers at Axpona are also meant to be used close to the front wall, not sure if you saw/heard them.
That is on the wall/surface - no conceptual difference regarding the first reflection (see Allison Three loudspeaker). So, only three.
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Nope, your three locations didn't mention the floor, just the ceiling. And the corner is a very special place.
Not "ceiling", but "in-ceiling (in-wall)".
On-ceiling is conceptually identical to on-wall.
I didn't mentioned floor, because on-floor (away from walls) is conceptually identical to on-wall (away from floor and ceiling), but with possibility for even less time difference between direct wave and the first reflection , i.e. higher cancelation frequency (details in the paper from post #312 - link)
Nope - it is just three walls/surfaces in the close proximity to the woofer (see Allison Three). Except higher SPL, not conceptually different from two surfaces (one wall and one floor - Allison One/Two) closest to the woofer, or one surface (one wall - Allison Five/Six, or one floor - Allison Five/Six turned 90 degrees sideways, if one really want to be pedantic) closest to the woofer. All of these Allison designs bring woofer very close to the nearby wall/flor/corner. Allison Three is the same concept as Bose 2201, low-frequency wise. You can place two Bose 2201 side-by side (also mentioned in their promotional literature) and voila - it is Allison One/Two!
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In this case the corner is a special place because this speaker maximises room coverage while maximising the first reflection arrival time for the room. Of course it does this in a generalised way, ie it doesn't cater to a listening position. It removes the early reflections from the corner where it is situated by being designed to go along with it.
In a multi-room installation, I've also placed LS3/5A speakers recessed and flush with the wall surface.
This is a substantial improvement from being either near to or far from the back wall.
I only wish I could place my Quads vertically in fitted wall openings to the next room.
This is a substantial improvement from being either near to or far from the back wall.
I only wish I could place my Quads vertically in fitted wall openings to the next room.
After my old experiences expelling a whole breath of air into subwoofer boxes (checking for leaks; good thing I never used rockwool or glass fibre or asbestos for vibration damping, eh? 😆 ), and discovering just how soft and springy it was (@ low frq. anyway) I always find it odd when people treat the air 'stiffness' like it's water, or needs to withstand 2-3 atmospheres.
The 1.5" oak could be concentrated just around the speaker driver. Add a 5kg lead weight behind the magnet for good measure, and make the rest from 0.5mm brass tubing!
Slapping conventional loudspeaker in the corner is not the same as designing loudspeaker to take advantage of the corner placement.
From the viewpoint of a loudspeaker designer, corner is as "special" place as on-wall speaker placement, or in the intersection of two walls (or floor-wall). Take only the bottom part of the Allison Three enclosure (woofer only) - that triangular enclosure structure can be used with the same success in all these three places - which are only a variants of an on-wall (on-surface) placement.
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Wish I saw this comment more often. Sometimes I need to remind myself to do the same