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Old 15th August 2008, 09:50 PM   #1
diyAudio Member
 
Join Date: Mar 2008
Default Cheap Absorber/Diffuser

Hi there,

i am posting this in the "FullRange" board,
because my loudspeakers are basically Fullrange
OB and tests have been run with those speakers.

Single absorber in front of a room corner:

http://img521.imageshack.us/my.php?i...bild045xt7.jpg

Rear side of absorber:

http://img521.imageshack.us/my.php?i...bild046rq0.jpg

Note: FR is not measured in regular listening position,
but for demonstration purposes 40 cm from the bottom.

FR without absorber:

http://img87.imageshack.us/img87/668...essung2mo1.jpg


FR with absorber:

http://img523.imageshack.us/img523/7...essung2vz0.jpg

Costs per absorber: Approx. 12 Euros
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Oliver, RFZ believer (?)
www.dipol-audio.de
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Old 15th August 2008, 10:10 PM   #2
diyAudio Member
 
Join Date: Mar 2008
Some comments to measurement conditions:

The subwoofer belonging to the "Dipol 08" OB
was switched off.

A single speaker was placed in a way, that the rear
lobe of the dipole was aiming directly at the the corner.

This is a demo setting for the absorber/diffuser,
not a proper placement of the Dipol 08 OB.

Distance of OB to the corner approx 1.6 m.

Distance of microphone approx. 60cm to the front
of the baffle. Microphone approx 40cm from the bottom.
Non directive microphone.

FR measured by step response, each measurement averaged
over 10 impulses.
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www.dipol-audio.de
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Old 15th August 2008, 10:11 PM   #3
diyAudio Member
 
Join Date: Jan 2002
Location: Tyrone Ga. U.S.A.
That was a bad link! An add poped up add wanted to take my computer maby not a real virus but close to one. BAD Link do not
go there.
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Old 15th August 2008, 10:31 PM   #4
diyAudio Member
 
Join Date: Mar 2008
woody,

i feel sorry for your problems, but i thought of
imageshack.us to be a trusted site.

Please tell us, which link caused the problem.

I cannot see any problems, when accessing the pictures
from my computer and there have been no suspect
processes started.

I use latest "resident spybot" version to track my
processes running.

Are there other members who had problems using
imageshack in the past ?

I'd like to know.

I can publish the pics somewhere else.


Maybe we should ask one of the administrators to analyse
the problem and delete the thread if necesssary.

Kind regards
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Oliver, RFZ believer (?)
www.dipol-audio.de
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Old 15th August 2008, 11:27 PM   #5
diyAudio Member
 
Join Date: Mar 2008
OK,

i checked the links, scanned my computer...
i cannot reproduce the problem mentioned.

Nevertheless, for security i will open a new thread
without external links to the pics.

Kind Regards
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Oliver, RFZ believer (?)
www.dipol-audio.de
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Old 16th August 2008, 12:11 AM   #6
r8833 is offline r8833  Canada
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Join Date: Nov 2004
Location: Moose Jaw, Sk
link is good..no pop ups ...what kind of materials did you use to make diffusers
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Old 16th August 2008, 12:19 AM   #7
diyAudio Member
 
Join Date: Mar 2008
Lets use the new thread i opened for safety:


Reload: Cheap DIY Absorber/Diffuser

But i agree, woodys problem may be home made.
But who knows ...
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www.dipol-audio.de
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