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Post by keager on Apr 8, 2012 20:36:17 GMT -7
If one were to make an opening in a wall for a manifold, and the stud spacing was narrow and wierd, could you open up two sections to accomadate the width, and have a stud kinda in front of the opening of the manifold? would that adversly affect the sound?
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Post by chrisbee on Apr 8, 2012 22:47:37 GMT -7
If one were to make an opening in a wall for a manifold, and the stud spacing was narrow and wierd, could you open up two sections to accomadate the width, and have a stud kinda in front of the opening of the manifold? would that adversly affect the sound? Provided it doesn't impact on mouth area I wouldn't worry about the stud from an SQ point of view. However, the manifold might need to be made wide enough to use the next set of studs for physical support. You can't hang a heavy manifold direct from the plasterboard. Longer manifolds rely on the wall studs to spread the wall skin effect to avoid the manifold mouth flexing. Careful reinforcement with large section timber spacers and/or plywood would allow a narrower manifold. One which would fit between three studs rather than the usual two. |
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Post by keager on Apr 9, 2012 3:19:18 GMT -7
What do you mean "doesn't impact on mouth area? mine has a spacing of about 9-10 inches then another stud about 6 inches further, due to the corner of the room. So there would be a stud kinda off center in the middle of the opening. I could make "spacers" so the manifold is attached to the outer studs.
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Post by keager on Apr 9, 2012 3:25:07 GMT -7
Also, If I did a in floor manifold, I have only about a two foot crawlspace under my house, so obviously not heated. Are there any ill effects of the backs of the drivers bein in the cold( can get below zero here in winter, and snow, but pretty dry most of time). Do you tend to loose a lot of heat through the cones and structure of the manifold?
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Post by chrisbee on Apr 9, 2012 4:42:51 GMT -7
Also, If I did a in floor manifold, I have only about a two foot crawlspace under my house, so obviously not heated. Are there any ill effects of the backs of the drivers bein in the cold( can get below zero here in winter, and snow, but pretty dry most of time). Do you tend to loose a lot of heat through the cones and structure of the manifold? My IB uses an uninsulated, unheated, fully glazed roof gable end for its enclosure. I noticed the manifold sweated inside the bottom of the back panel in winter. The panel is laminated 2 x 3/4" Baltic ply. This sweating lead to a white mould growth. Easily wiped off but boring. So I stapled a closed cell foam, camping mattress to the back of the box and this has reduced the sweating considerably. The cones have never shown any signs of sweat. Neither the paper cones nor the vinyl. All my fears of severe heat loss have not been confirmed. I used a Black and Decker Thermal Leak Detector and found the manifold and driver surfaces are definitely cool. Though certainly not as bad as an ordinary, double-glazed window. We all happily live with windows. So I wouldn't worry about heat loss. Particularly in a floor mounting. I'd make sure rodents cannot gain access to your driver cones. Fine wire mesh is cheap enough and can be stapled to the manifold over the drivers. Assuming you have access! All eight of my driver magnets are inside the box. If you have no underfloor access then a thin wooden frame could be fixed outside the driver cut-outs and covered in a flat panel of fine wire mesh. Hopefully beyond any likely driver Xmech if rodents are a problem. How large is the area beneath your AV room? Two feet doesn't make a large volume unless you have a considerable area of this depth. No problem if the whole house is open across the underfloor. There are often well perforated dwarf walls down there to ensure adequate cross ventilation via air bricks in the external walls. (which must not be closed off!) |
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Post by keager on Apr 9, 2012 6:10:02 GMT -7
The crawlspace is under the entire house( bottom level about 1000sq ft.). Did you see my descpription of the weall stud issue to see if its an issue? there would be a 2x4 basically right in front of the mouth of the manifold. However I would be able to have the mouth up to 16 inches wide if necessary. Thanks for taking the time to help.
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Post by severianb on Apr 9, 2012 8:20:03 GMT -7
I'd respectfully disagree with Chrisbee, (if I'm understanding him) and say it doesn't really matter if you have a 2x4 in the manifold mouth. The original IBs that Nousaine and friends made back in the day had tiny manifold openings.... I personally think the whole "mouth opening being the same size as the driver surface area" suggestion is way down on the list of IB worries... so a couple 2x4's is a non-issue.
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Post by keager on Apr 9, 2012 9:08:27 GMT -7
Hmmm. I will measure and post the dimensions exactly. Thanks
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