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Old 14th March 2013, 11:32 AM   #2131
lolo is offline lolo  France
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Quote:
Originally Posted by Elias View Post
I see So without any absorption the first reflection is something like -3dB ?
maybe? I would need to redo a set of measurements without the pads, and without the thick carpet..
without toe in the side reflexion is at 0db!

one thing really bothers me, the signal is not clean at all in the first 1ms.
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Old 14th March 2013, 11:51 AM   #2132
Rudolf is offline Rudolf  Germany
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one thing really bothers me, the signal is not clean at all in the first 1ms.
To me it is as clean as it gets in the first ms. All ETCs I know have widened somewhat at -15 dB.
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Old 14th March 2013, 12:56 PM   #2133
lolo is offline lolo  France
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Ah, thanks Rudolf, glad I don''t have to carry the speakers out to verify.
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Old 14th March 2013, 01:00 PM   #2134
Elias is offline Elias  Finland
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Here is some early flooders. In 1938 G. Bucky visioned the sound to be coming from ceiling reflections.

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Old 14th March 2013, 01:03 PM   #2135
Elias is offline Elias  Finland
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But then after three years something went terrible wrong, since he concluded the sound of the ceiling firing flooders is coming from the floor !!

Just see how the speakers are wired

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Old 14th March 2013, 01:10 PM   #2136
lolo is offline lolo  France
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the one on the floor is a subwoofer! :-)
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Old 14th March 2013, 01:40 PM   #2137
graaf is offline graaf  Poland
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But then after three years something went terrible wrong, since he concluded the sound of the ceiling firing flooders is coming from the floor !!
??? wtf???
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Old 14th March 2013, 02:45 PM   #2138
Elias is offline Elias  Finland
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??? wtf???
Things aint hilarious if you need to explain them

"... the sound is coming from the floor ..."

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Old 14th March 2013, 03:18 PM   #2139
graaf is offline graaf  Poland
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Things aint hilarious if you need to explain them

"... the sound is coming from the floor ..."
I can see that some wires are "coming from the floor"... but what about the sound??? ...er... "hillarious "??? Am I to understand that You donīt like good humour in audio?
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Old 14th March 2013, 04:36 PM   #2140
ScottG is offline ScottG  United States
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most probably not - not substantial - but also most probably highly depending on the program material

and I ask why not

because only if we know why we can say when it can happen and only the we can consciously take it into account in the loudspeaker design
-assuming a "fast" transient in the freq. range.

Even then - almost certainly doubtful.

Why? Because as the timing cue lowers for any reflective condition it becomes increasingly inaudible (all else equal). A near-time actual reflection with that same "fast" transient in the freq. range - doesn't alter the presentation in an audible fashion, what suggestion is there that an even more time-abbreviated reflective condition would? NONE.

Along with the timing aspect of the direct sound onset, you can have resonant artifacts with most program material (i.e. "broad-band") - but there the focus is on the corruption of the signal with respect to intensity, not time.


BTW, I don't mind questioning this - but I don't have *any* reason to believe any differently from what I've just stated. Prove me wrong.
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