Hi Eric,
You confused a poor old man there...I was wondering "Why does he need
the blankets to move around?? Surely they're just as efficient when they
are still?" Then I thought "Duhhhhh..."
Trouble is, we haven't moved for four decades and back then we just chucked
some straw into the removal guy's cart to protect the furniture :-)
Difficult to hang straw up with string...but use straw bail construction
for your listening room, especially if they are staggered and/or angled to
add some diffusion and you might well get pretty well dead acoustics - and
good eco-credentials as well.
Dave
On 21 October 2014 19:01, Eric Benjamin <[email protected]> wrote:
> How have you determined that reflections from the room walls are the
> source of the perceptual problems?
>
> To test for that, it might be best to try a temporary fix first. I have
> successfully used moving blankets to prototype room treatment. If moving
> blankets are installed away from the actual walls then they are extremely
> efficient absorbers, even down to low frequencies. This can be done using
> hooks and twine and the amount of absorption can make the room almost
> anechoic. Perhaps they can be attached to the outside of your rig.
>
> Moving blankets can typically be purchased for $10 each or about $80 for a
> dozen.
>
>
> On Tuesday, October 21, 2014 1:52 AM, Bo-Erik Sandholm <
> [email protected]> wrote:
>
>
>
> Covering the corners - floor and walls + roof and walls with something
> diffusing or absorbing is probably the most important, a corner is a
> perfect for reflecting incoming sound back in source direction.
> After the corners come the other 90 degrees angles bit hey are not as
> critical, but a soft longhaired carpet along the walls or on the walls up
> to around a meter height is good.
>
> Best Regards Bo-Erik
>
> -----Original Message-----
> From: Sursound [mailto:[email protected]] On Behalf Of
> Tommaso Perego
> Sent: den 21 oktober 2014 07:10
> To: [email protected]
> Subject: [Sursound] Ambisonic Cube reverberation attenuation with foam
>
> Hello Everyone
> I was wondering if you could please help me solve the following problem.
>
> I have encountered reverberation issues with an Ambisonic installation, of
> dimension 5x5x2.5 meters (a squashed cube, so to speak).
>
> I have noticed that reverberation is due to the proximity to the
> surrounding walls (7x12x6), causing imperfect appreciation of the spatial
> sound designs when heard in the middle of the cube.
> Assuming that this is the correct understanding of the problem I was
> wondering if:
>
> - surrounding the cube with the following foam material
>
> http://www.anyfoam.co.uk/sheet-foam.php <
> http://www.anyfoam.co.uk/sheet-foam.php> (the acoustic foam)
>
> would significantly reduce reverberation effect to better the definition
> inside the cube?
>
> - where exactly would be best to put the foam? Would just the sides
> (excluding floor and ceiling) of the cube be enough ?
>
> - should reducing the overall sound power improve the situation?
>
>
> Looking forward to hear your opinion, I would greatly appreciate your help
> Thank you
>
> kind Regards
>
> Tommaso
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--
As of 1st October 2012, I have retired from the University.
These are my own views and may or may not be shared by the University
Dave Malham
Honorary Fellow, Department of Music
The University of York
York YO10 5DD
UK
'Ambisonics - Component Imaging for Audio'
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