Re: [Sursound] Ambisonic Cube reverberation attenuation with foam
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 Duh... 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 eb...@pacbell.net 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 bo-erik.sandh...@ericsson.com 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:sursound-boun...@music.vt.edu] On Behalf Of Tommaso Perego Sent: den 21 oktober 2014 07:10 To: sursound@music.vt.edu 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 -- next part -- An HTML attachment was scrubbed... URL: https://mail.music.vt.edu/mailman/private/sursound/attachments/20141021/7de23efb/attachment.html ___ Sursound mailing list Sursound@music.vt.edu https://mail.music.vt.edu/mailman/listinfo/sursound - unsubscribe here, edit account or options, view archives and so on. ___ Sursound mailing list Sursound@music.vt.edu https://mail.music.vt.edu/mailman/listinfo/sursound - unsubscribe here, edit account or options, view archives and so on. -- next part -- An HTML attachment was scrubbed... URL: https://mail.music.vt.edu/mailman/private/sursound/attachments/20141021/17073ca2/attachment.html ___ Sursound mailing list Sursound@music.vt.edu https://mail.music.vt.edu/mailman/listinfo/sursound - unsubscribe here, edit account or options, view archives and so on. -- 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' -- next part -- An HTML attachment was scrubbed... URL: https://mail.music.vt.edu/mailman/private/sursound/attachments/20141022/68cb9ab1/attachment.html ___ Sursound mailing list Sursound@music.vt.edu https://mail.music.vt.edu/mailman/listinfo/sursound - unsubscribe here, edit account or options, view archives and so on.
Re: [Sursound] Ambisonic Cube reverberation attenuation with foam
Foam will help but you should also include some diffusion maybe some RPG (Random Phase Grating), maybe just some additional furniture - we once tamed a terrible room enough to put on a concert (Assembly Room in York) by upending a bunch of tables and placing them outside the array in a somewhat irregular pattern - maybe even some of the very crude, old fashioned hemispherical diffusers made with bendy mdf would help. Also, try moving the array off centre in the room or changing its orientation. Dave P.S. Try looking at these pages for more on diffusion;- http://homerecording.com/bbs/general-discussions/studio-building-acoustic-treatment/diy-diffusors-do-they-exist-207974/ http://arqen.com/sound-diffusers/ On 21 October 2014 06:09, Tommaso Perego tomgali...@mac.com wrote: 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 -- next part -- An HTML attachment was scrubbed... URL: https://mail.music.vt.edu/mailman/private/sursound/attachments/20141021/7de23efb/attachment.html ___ Sursound mailing list Sursound@music.vt.edu https://mail.music.vt.edu/mailman/listinfo/sursound - unsubscribe here, edit account or options, view archives and so on. -- 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' -- next part -- An HTML attachment was scrubbed... URL: https://mail.music.vt.edu/mailman/private/sursound/attachments/20141021/3568a8ff/attachment.html ___ Sursound mailing list Sursound@music.vt.edu https://mail.music.vt.edu/mailman/listinfo/sursound - unsubscribe here, edit account or options, view archives and so on.
Re: [Sursound] Ambisonic Cube reverberation attenuation with foam
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:sursound-boun...@music.vt.edu] On Behalf Of Tommaso Perego Sent: den 21 oktober 2014 07:10 To: sursound@music.vt.edu 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 -- next part -- An HTML attachment was scrubbed... URL: https://mail.music.vt.edu/mailman/private/sursound/attachments/20141021/7de23efb/attachment.html ___ Sursound mailing list Sursound@music.vt.edu https://mail.music.vt.edu/mailman/listinfo/sursound - unsubscribe here, edit account or options, view archives and so on. ___ Sursound mailing list Sursound@music.vt.edu https://mail.music.vt.edu/mailman/listinfo/sursound - unsubscribe here, edit account or options, view archives and so on.
Re: [Sursound] Ambisonic Cube reverberation attenuation with foam
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 bo-erik.sandh...@ericsson.com 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:sursound-boun...@music.vt.edu] On Behalf Of Tommaso Perego Sent: den 21 oktober 2014 07:10 To: sursound@music.vt.edu 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 -- next part -- An HTML attachment was scrubbed... URL: https://mail.music.vt.edu/mailman/private/sursound/attachments/20141021/7de23efb/attachment.html ___ Sursound mailing list Sursound@music.vt.edu https://mail.music.vt.edu/mailman/listinfo/sursound - unsubscribe here, edit account or options, view archives and so on. ___ Sursound mailing list Sursound@music.vt.edu https://mail.music.vt.edu/mailman/listinfo/sursound - unsubscribe here, edit account or options, view archives and so on. -- next part -- An HTML attachment was scrubbed... URL: https://mail.music.vt.edu/mailman/private/sursound/attachments/20141021/17073ca2/attachment.html ___ Sursound mailing list Sursound@music.vt.edu https://mail.music.vt.edu/mailman/listinfo/sursound - unsubscribe here, edit account or options, view archives and so on.
[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 -- next part -- An HTML attachment was scrubbed... URL: https://mail.music.vt.edu/mailman/private/sursound/attachments/20141021/7de23efb/attachment.html ___ Sursound mailing list Sursound@music.vt.edu https://mail.music.vt.edu/mailman/listinfo/sursound - unsubscribe here, edit account or options, view archives and so on.
