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Old 5th December 2011, 03:53 PM   #761
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Quote:
Originally Posted by Helmuth View Post
Due the wave length and path traveled the reflection will ad in opposite phase
...only for certain frequencies. The very same is true for a dipole. Now consider that we're talking about wavelengths that don't produce "reflections" because the room is small compared to the wavelength.
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Old 5th December 2011, 05:04 PM   #762
Helmuth is offline Helmuth  Netherlands
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Quote:
Originally Posted by markus76 View Post
...only for certain frequencies. The very same is true for a dipole. Now consider that we're talking about wavelengths that don't produce "reflections" because the room is small compared to the wavelength.
Witch wave length are you thinking of?
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Old 5th December 2011, 05:09 PM   #763
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Originally Posted by Helmuth View Post
Witch wave length are you thinking of?
All frequencies below and around the Schröder frequency.
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Old 5th December 2011, 05:59 PM   #764
Helmuth is offline Helmuth  Netherlands
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Quote:
Originally Posted by markus76 View Post
All frequencies below and around the Schröder frequency.
that would be below 200-300Hz with what I measure and hear it doesn't make sense what you say there.
So your making a faulty assumption somehow and I do not know why.

It also would mean the OB doesn't make sound below the schroder frequency.
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Old 5th December 2011, 07:07 PM   #765
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Originally Posted by Helmuth View Post
that would be below 200-300Hz with what I measure and hear it doesn't make sense what you say there.
So your making a faulty assumption somehow and I do not know why.

It also would mean the OB doesn't make sound below the schroder frequency.
Why would an open baffle not make any sound below the Schröder frequency? Either your or my understanding of sound propagation in air is false.
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Old 5th December 2011, 07:31 PM   #766
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Markus do you have pics to share? This is a gallery thread
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Old 5th December 2011, 08:11 PM   #767
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Nice recently built Nao Note:

NaO Note preview

Click the image to open in full size.

Click the image to open in full size.
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Old 5th December 2011, 10:29 PM   #768
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Great build...ROUGH room for sure. Ouch!
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Old 6th December 2011, 12:46 AM   #769
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Originally Posted by rob g View Post
I do not know what he is talking about. Usually people worry about the out of phase wave from dipole not monopole. Even that is not a major concern in real rooms:

From Linkwitz lab's:
"Often concern is expressed over the fact that the rear radiation from a dipole is out of phase with the front radiation, and that thus any sound reflected from a wall behind the speaker would cancel sound coming from the front of the speaker. Cancellation can only occur when direct and reflected sounds are exactly of opposite phase (180 degrees) and of the same strength. Since direct and reflected sounds travel paths of different length, they undergo different amounts of phase shift. Thus, the phase and magnitude conditions for cancellation are given only at certain frequencies, if at all. At some other frequencies direct and reflected sounds will add. The same also applies to a monopole speaker in front of a wall. The only difference is in the frequencies for which addition and subtraction occur. The best remedy is to move the speaker away from the wall, or to make the wall as sound absorptive or diffusive as possible"
SL is talking in generalities here, as he often does, and about higher frequencies. The behavior of monopole, dipole and cardioids, due to the reflection from the wall behind the speaker is discussed HERE. And the real situation is more complicated due to room modes.
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Old 6th December 2011, 06:23 AM   #770
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Originally Posted by mayhem13 View Post
Great build...ROUGH room for sure. Ouch!

I agree, room is untreated, and with worst floor material possible. I imagine how uncomfortable acoustics is. Dips an peaks in this room definetly can reach +-10db not onnly in bass.
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