Rick Powell wrote on Sat, 06 December 2008 20:08 |
Forget Auralex or other foam based products. They are highly flammable without treatment ..... |
Dick Rees wrote on Sat, 06 December 2008 21:14 | ||
http://www.auralex.com/auralex_acoustics_faqs/fire_retardanc y_faqs.asp I think you should check this out a little further. Your experience seems to be limited to only one of their products. They do indeed make bass reduction systems. Look at their whole line. It will give you some good ideas if nothing else. |
Jason Dermer wrote on Sun, 07 December 2008 21:24 |
Find a bonded/ insured acoustic design company. Pay them to do the work safely and properly. Enjoy your SAFE, better sounding room. Unless you are willing to take the chance at making the sound worse and have the insurance to cover the possibility of EVERYONE at your gig DYING, There are no other options. As I have mentioned multiple times in the past, the last Great White show before the Station disaster was at one of my house gigs, so I do not take the sound deadening issue lightly. Do it right, or stay away. |
Art Welter wrote on Tue, 09 December 2008 14:12 |
The reverse parabola scatters, rather than absorbs the sound waves, the spectral content stays roughly the same, while the standing waves and HF chatter are largely eliminated. |
Brad Weber wrote on Tue, 09 December 2008 15:16 | ||
I agree that convex diffusers can be very effective and any diffusion would probably help however convex or 'barrel' diffusers are one dimensional diffusers and are spectral, the overall size and depth of the diffusers will affect the frequency range over which they are effective. Providing elements of varying size and radii can help provide effectiveness over a wider range and having varying orientations can also help with ceiling applications. Other similar options might include pyramidal diffusers, which are two dimensional diffusers and for which some of manufactured units are asymmetrical and can then be randomly rotated to provide more random diffusion. Another option, although not necessarily for those on a tight budget, might be RPG BAD or Kinetics TAD panels which are absorbers at lower frequencies and transition to binary diffusers at higher frequencies, similar to what was apparently intended with the custom built panels noted but with two dimensional diffusion. If budget is even more forgiving, then RPG Omniffusor, Abffusor or QRD panels might even be an option. |
Brad Ferguson wrote on Wed, 10 December 2008 01:22 |
Thanks for all the suggestions, guys! I knew I could count on the big brains on this board to help me out. I'm not too worried about absorbing LF information - the big problem is basically snare drums ringing way too loudly off the stage. I'm sourcing some 703, and I'm going to basically cover some ply with it, and some material. Should be cheap enough, and I have some lines on some fire resistant material. |
Art Welter wrote on Tue, 09 December 2008 21:25 |
John, I normally use a router for repeatability, but in the case of making these arcs, using a band saw was faster and saved quite a bit of material. The OP wanted cheap, so Baltic Birch was out, and in this application, flexible is actually better so cheap and cheerful is good. If I would have known about the large diameter Sonotubes at the time I did this work, would have used it, it would have been cheaper and easier than the plywood “wings”. Art |
Brad Ferguson wrote on Wed, 10 December 2008 01:22 |
I'm sourcing some 703, and I'm going to basically cover some ply with it, and some material. Should be cheap enough, and I have some lines on some fire resistant material. |
Rick Powell wrote on Wed, 10 December 2008 21:45 |
If the 703 has an open backing (such as a frame, with the 703 covered with fabric on both flat surfaces), and the panel is spaced a few inches away from the wall, you will have twice the absorption area. When you mount flush to the wall, or put a solid backing on the panels, you are giving away half the panel's effectiveness potential. Just a thought. ATS puts their panels in a wooden slat frame much like a bedding frame, so that both flat surfaces are absorptive. |
Rick Powell wrote on Wed, 10 December 2008 21:37 |
A homemade version of the same could be expected to have similar results - it's not rocket science to build these things, and the material has consistent and well known properties. |