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Interesting stuff. This conversation has me thinking, if one bought OB speakers but couldn't move them out into the room far enough to get the proper reflective delay effect (with distance alone), could partial absorption behind the speakers help simulate the desired effect? I'm thinking about something like an open weave cloth curtain on the wall behind the speakers, not thick foam or anything like that.
First, this thread isn't about OB it is about semi open baffles.Second, I know folded horn designs sound terrible due to how they distort sound. This might not be an issue however as you don't need to create a horn shape for one, and secondly, this isn't modifying the direct sound waves you are interested in hearing. This is modifying reflected background noise.Third. The folded horn would create nasty resonance patterns as sound waves reflect back to the driver... You would need to have the reflective surfaces occur at a gradient of distances to smooth out the harmonic resonances.Also, if anyone doesn't like thought experiments, you don't have to read the thread.
I don't think this would give you the effect desired from open baffle. You don't want to get rid of the sound emanating from the back of the speaker and reflecting off the wall, you simply want to delay it.
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