Subject: [AUDITORY] Anechoic room floor grate construction question From: "Brian FG Katz (SU)" <brian.katz@xxxxxxxx> Date: Sun, 9 Aug 2020 12:10:55 +0200Dear community,=20 This is a message for those of you that have an anechoic room.=20 We have an relatively new anechoic room. The floor is a series of metal = grate panels (basically these = https://sc01.alicdn.com/kf/HTB14iKDsyAKL1JjSZFoq6ygCFXaI.jpg) that sit = on support beams, able to support the weight of say a grand piano... A = suspended wire mesh solution is not suitable for our needs. We are currently having problems with the floor grate panels in our = anechoic room, being that they are very "ringy", easily excited = acoustically, i.e. a hand clap makes an audible ring with a clear = reverberation time in a narrow frequency band.=20 We have tried multiple means for isolating them (neoprene pads) with no = effect. Damping them needs so much material and weight that they are no = longer transparent. So, I am interested to know what type of rigid grate = solutions any of you may have that you are happy with.=20 I hope that bouncing this idea of this large list will get me are good = range of solutions that we can then consider in order to replace what we = have, without having to go through a large battery of samples and = testing.=20 As images would be helpful, please email me directly, as I think the = list filters out attachments.=20 Thank you in advance, -Brian -- Brian FG Katz, Ph.D, HDR Research Director, CNRS Groupe Lutheries - Acoustique - Musique Sorbonne Universit=C3=A9, CNRS, = UMR 7190, Institut Jean Le Rond =E2=88=82'Alembert web_perso: http://www.dalembert.upmc.fr/home/katz web_lab: http://www.dalembert.upmc.fr web_group: http://www.dalembert.upmc.fr/lam youtube_group: https://www.youtube.com/c/LAMSorbonneUniversite/videos facebook_group: @xxxxxxxx = https://www.facebook.com/lam.dalembert.upmc/=20