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Enclosure Design & Construction
holding a box together
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<blockquote data-quote="Savant" data-source="post: 137090" data-attributes="member: 546108"><p>Porus doesn't mean 'leak air'.. it means little cavaties on the surface (more or less).. your skin is porus but your lungs work because your chest is a vaccume inside.. if porus meant leak, we wouldn't be able to breath..</p><p></p><p>That said, fiberglass + resin is very low on the porus scale.. you can put water on it and it won't seep in... MDF will **** up water even though there is glue/epoxy/whathaveyou holding it together.. the 'bulk' of the material is wood.. with fiberglass, the bulk is glass and solid plastic..</p><p></p><p>Putting 'fiberglass' in a box (meaning layering a buildup with resin etc).. Not sure you will gain anything there.. it might have a higher resonance (reflect sound better) than the MDF and prevent some of the sound from getting absorbed by the wood (it might muddy the sound a bit, the glass might help keep it crisp).. but I doubt you would really notice much difference.. Putting Fiberglass Insulation in the box.. now that's a totally different matter.. that's like putting in fill (that's what it is actually, just not called 'fill'..).. I forget exactly how that works.. I think fill is supposed to make the woffer think there is 'more' volume in the box, which is counter intuitive since you filled up space.. I just know my buddy (way back when) would put insulation (filler) in his enclosures once in a while.. not sure it really made a difference.. Perhaps that's what was meant by the suggestion to you?</p></blockquote><p></p>
[QUOTE="Savant, post: 137090, member: 546108"] Porus doesn't mean 'leak air'.. it means little cavaties on the surface (more or less).. your skin is porus but your lungs work because your chest is a vaccume inside.. if porus meant leak, we wouldn't be able to breath.. That said, fiberglass + resin is very low on the porus scale.. you can put water on it and it won't seep in... MDF will **** up water even though there is glue/epoxy/whathaveyou holding it together.. the 'bulk' of the material is wood.. with fiberglass, the bulk is glass and solid plastic.. Putting 'fiberglass' in a box (meaning layering a buildup with resin etc).. Not sure you will gain anything there.. it might have a higher resonance (reflect sound better) than the MDF and prevent some of the sound from getting absorbed by the wood (it might muddy the sound a bit, the glass might help keep it crisp).. but I doubt you would really notice much difference.. Putting Fiberglass Insulation in the box.. now that's a totally different matter.. that's like putting in fill (that's what it is actually, just not called 'fill'..).. I forget exactly how that works.. I think fill is supposed to make the woffer think there is 'more' volume in the box, which is counter intuitive since you filled up space.. I just know my buddy (way back when) would put insulation (filler) in his enclosures once in a while.. not sure it really made a difference.. Perhaps that's what was meant by the suggestion to you? [/QUOTE]
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