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2002 Toyota Tundra Access Cab - center console sub
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<blockquote data-quote="keep_hope_alive" data-source="post: 7639538" data-attributes="member: 576029"><p>sure.</p><p></p><p><img src="http://i38.photobucket.com/albums/e128/phat_funky_beats/Tacoma%20center%20console/doors/Tundradoors012.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /></p><p></p><p>adding an inch or two of absorption behind the speaker won't do much for low frequencies, but you get some break-up of the rear wave and some absorption (minimal) of upper midrange frequencies. how much absorption depends on the material used, its density, and it's thickness. just as polyfill provides some benefit in a sub enclosure, the stuff i used in the pic above is much dense than the stuff you buy in bags (and was in a large sheet). midrange frequencies are what suffer when you have a hard reflecting plane right behind the driver (concave) since the distance from driver to wall and back causes phase cancellation in midrange frequencies. you want to weaken the rear wave reflection, break it up, so it doesn't come back to the cone. adding absorption in the corners of the door cavity would provide some low frequency absorption, but behind the woofer is a minimalistic approach. with vs without is noticeable and with is preferred. it's an easy test to try for yourself. it's similar to the premise of deflex pads.</p><p></p><p>my next experiment will be replacing that with PVC encased fiberglass batt that is compressed. in architectural acoustics, we use pvc encased fiberglass (around 1pcf) in banners to add absorption in pools and gyms.</p></blockquote><p></p>
[QUOTE="keep_hope_alive, post: 7639538, member: 576029"] sure. [IMG]http://i38.photobucket.com/albums/e128/phat_funky_beats/Tacoma%20center%20console/doors/Tundradoors012.jpg[/IMG] adding an inch or two of absorption behind the speaker won't do much for low frequencies, but you get some break-up of the rear wave and some absorption (minimal) of upper midrange frequencies. how much absorption depends on the material used, its density, and it's thickness. just as polyfill provides some benefit in a sub enclosure, the stuff i used in the pic above is much dense than the stuff you buy in bags (and was in a large sheet). midrange frequencies are what suffer when you have a hard reflecting plane right behind the driver (concave) since the distance from driver to wall and back causes phase cancellation in midrange frequencies. you want to weaken the rear wave reflection, break it up, so it doesn't come back to the cone. adding absorption in the corners of the door cavity would provide some low frequency absorption, but behind the woofer is a minimalistic approach. with vs without is noticeable and with is preferred. it's an easy test to try for yourself. it's similar to the premise of deflex pads. my next experiment will be replacing that with PVC encased fiberglass batt that is compressed. in architectural acoustics, we use pvc encased fiberglass (around 1pcf) in banners to add absorption in pools and gyms. [/QUOTE]
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2002 Toyota Tundra Access Cab - center console sub
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