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Car Forum / Driving, Maintenance, Tuning / Car Audio / February 2006Alternative cabinet construction ideas
I have some ideas for speaker cabinet designs and I'd like your input. I'm not sure if any of you have seen sound dampening "studio foam". It's basically a square pad with pyramids on it that dampen sound waves, for reducing sound reflection and standing waves. Would it be a good idea to texture the inside of the cabinet like this? I was also curious to the affect of multi-ply cabinet walls with soft material inbetween each ply to provide insulation. My idea is to take several thin sheets of wood, apply fiberglass resin to the outside to add some rigidity, and use these as the plys. Then put insulation foam or something similar inbetween each ply. Build up several plys and then connect them all into one unit with several tight bolts. >I have some ideas for speaker cabinet designs and I'd like your input. I'm > not sure if any of you have seen sound dampening "studio foam". It's > basically a square pad with pyramids on it that dampen sound waves, for > reducing sound reflection and standing waves. Would it be a good idea to > texture the inside of the cabinet like this? Yes, definitely. Any type of dampening on the inside of your enclosure helps reduce standing waves. I have known guys who line the insides of their sub boxes with paper egg cartons. I would just be careful you don't apply so much that your volume of airspace is compromised in any significant way. MOSFET > I have some ideas for speaker cabinet designs and I'd like your input. I'm > not sure if any of you have seen sound dampening "studio foam". It's > basically a square pad with pyramids on it that dampen sound waves, for > reducing sound reflection and standing waves. Would it be a good idea to > texture the inside of the cabinet like this? Depends on the type of enclosure. Different frequencies have different wavelengths, those enclosures dealing with shorter wavelengths/higher frequencies will be helped by some type of dampening. Also, "studio foam" usually doesn't do anything below about 400hz. Correct room treatment goes far beyond foam. http://ethanwiner.com/acoustics.html <<< very informative. > I was also curious to the affect of multi-ply cabinet walls with soft > material inbetween each ply to provide insulation. My idea is to take > several thin sheets of wood, apply fiberglass resin to the outside to add > some rigidity, and use these as the plys. Then put insulation foam or > something similar inbetween each ply. Build up several plys and then > connect them all into one unit with several tight bolts. Any type of construction that adds mass and/or provides an airlock will be beneficial. Recording studios are somewhat built in this fashion, a room built within a room.  SignatureCyrus *coughcasaucedoprodigynetcough* >> I have some ideas for speaker cabinet designs and I'd like your input. I'm >> not sure if any of you have seen sound dampening "studio foam". It's >> basically a square pad with pyramids on it that dampen sound waves, for >> reducing sound reflection and standing waves. Would it be a good idea to >> texture the inside of the cabinet like this? Solid foam is best. The pyrimids only affect extremely high freqs/ The foam helps dampen walls and interior reflections. >Depends on the type of enclosure. Different frequencies have different >wavelengths, those enclosures dealing with shorter wavelengths/higher [quoted text clipped - 3 lines] >Correct room treatment goes far beyond foam. >http://ethanwiner.com/acoustics.html <<< very informative. Incedently, foam is the best absorber compared to fiberglass or anything else. http://www.pitt.edu/~szekeres/atten.txt greg >> I was also curious to the affect of multi-ply cabinet walls with soft >> material inbetween each ply to provide insulation. My idea is to take >> several thin sheets of wood, apply fiberglass resin to the outside to add >> some rigidity, and use these as the plys. Then put insulation foam or >> something similar inbetween each ply. Build up several plys and then >> connect them all into one unit with several tight bolts. I have seen plywood like, plexiglass, aluminum, plexiglass. etc. >Any type of construction that adds mass and/or provides an airlock will >be beneficial. Recording studios are somewhat built in this fashion, a >room built within a room. just be sure to compensate for the amount of airspace occupied by the foam. If the recommended sealed enclosure for your sub is 1.25 cubes, make sure if your sub occupies .11 you make it 1.36 cubes, and if your foam occupies .5 cubes you make it 1.86 cubes... or somewhere in between. Probably could divide the space that the foam occupies by two or so because of the fact that it is not a solid, so maybe something like 1.61 cubes. I've seen this done, and it does seem to keep the box from resonating at any frequencies and helps the speaker to do all of the moving. Signature- AUSTIN BECKER > > > >> I have some ideas for speaker cabinet designs and I'd like your input. I'm [quoted text clipped - 33 lines] > >be beneficial. Recording studios are somewhat built in this fashion, a > >room built within a room. >just be sure to compensate for the amount of airspace occupied by the foam. >If the recommended sealed enclosure for your sub is 1.25 cubes, make sure if [quoted text clipped - 4 lines] >done, and it does seem to keep the box from resonating at any frequencies >and helps the speaker to do all of the moving. Adding foam to a closed box lowers resonance, like making the box bigger. Polyfill is usually used here to fully stuff the box. Where did you come up with this stuff? greg >>just be sure to compensate for the amount of airspace occupied by the foam. >>If the recommended sealed enclosure for your sub is 1.25 cubes, make sure if [quoted text clipped - 11 lines] > >greg http://www.pitt.edu/~szekeres/resonant.txt Just depends on the density of what you are using. If you are using something like fiberglass matting which is already in strands, it will have a different effect than a solid piece of foam like the space pillows. Signature- AUSTIN BECKER > >>just be sure to compensate for the amount of airspace occupied by the foam. > >>If the recommended sealed enclosure for your sub is 1.25 cubes, make sure if [quoted text clipped - 13 lines] > > http://www.pitt.edu/~szekeres/resonant.txt > >> I have some ideas for speaker cabinet designs and I'd like your input. I'm > >> not sure if any of you have seen sound dampening "studio foam". It's [quoted text clipped - 20 lines] > > greg My comment was more pointed at studio construction than to boxed subs. Personal tastes dictate that no attenuation or excitation of any frequencies are needed within an enclosure, drivers do enough of that already. YMMV. > >> I was also curious to the affect of multi-ply cabinet walls with soft > >> material inbetween each ply to provide insulation. My idea is to take [quoted text clipped - 8 lines] > >be beneficial. Recording studios are somewhat built in this fashion, a > >room built within a room. SignatureCyrus *coughcasaucedoprodigynetcough* |
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