Stuffing Altec Model 19 cabs
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marantzfan
...
Fiberglass insulation lining the side walls and bottom; attach with spray on adhesive. :thmbsp:
Nothing on the rear? How thick should the fiberglass be?
marantzfan
...
Sorry about that, rear wall as well. In mine the sides and rear wall are covered by one contiguous sheet of insulation and then a smaller piece cutout for the bottom.
On the horn section it will be side walls, rear wall and top; the reverse of the bottom (woofer) section.
Altec Best
Well-Known Member
In mine the whole cabinet is covered except for back of baffle of course and there is a very thin black fabric that covers the insulation around near the port opening so you don't see the fiberglas.
I'm sorry but I need a little clarification. How thick should the insulation be? Just some regular R-11 available in any building supply store or something thinner? What kind of spray adhesive?
I found spray on 3M adhesive at Parts Express but had no luck finding "ripple foam" there. The only thing I found was "Acoustistuff" which I am sure I don't want.
I found spray on 3M adhesive at Parts Express but had no luck finding "ripple foam" there. The only thing I found was "Acoustistuff" which I am sure I don't want.
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dc270
Now Off the Reservation
I pulled the fiberglass out of mine to prevent little arm from reacjing in there and pulling it out!
The replacement I used were 16" x 1.5" square batts of "ripple foam" (parts Express) glued in place in a checkerboard pattern inside the box area. I think it worked very well and was a lot safer than fiberglass! Looked good at the port area too with some black spray paint.
While I was at it I wrapped foam around the horn body to prevent ring through, put HD caster on all four corners, threw away the pitiful particle board 2" x .75" toe board and replaced with meaty 2" x 2" pine bolted into place. If you are putting on casters this is a must! Lastly I put in Z19 xovers with bi-ampable 4 post connection plate. This was a set of 19's like nothing else!
DC
The replacement I used were 16" x 1.5" square batts of "ripple foam" (parts Express) glued in place in a checkerboard pattern inside the box area. I think it worked very well and was a lot safer than fiberglass! Looked good at the port area too with some black spray paint.
While I was at it I wrapped foam around the horn body to prevent ring through, put HD caster on all four corners, threw away the pitiful particle board 2" x .75" toe board and replaced with meaty 2" x 2" pine bolted into place. If you are putting on casters this is a must! Lastly I put in Z19 xovers with bi-ampable 4 post connection plate. This was a set of 19's like nothing else!
DC
Is this what you mean by "ripple foam"?
http://www.parts-express.com/pe/showdetl.cfm?partnumber=260-515&utm_source=googleps
This stuff is black so it would be "invisible through the port.
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westend
Audiopile
Altec used fiberglass and, at some point, covered it with a black mesh cloth (probably to improve cosmetics). The blue-jean material and acoustic foam appear to be excellent product but probably don't improve over fiberglass in great order for the purpose. I would save my money on those products and use fiberglass. There could also be a problem of over-damping the cabinet if too much esoteric foam is used.
If you can get ahold of some, sheet fiberglass, sold as Owens Corning 303, is one of the better acoustic products, IMO. It is easy to install and the fibers tend to hold together better than batt fiberglass. If using glass, I would definitely cover the lot with a mesh cloth as even the hint of fiberglass particles floating around is not a good thing.
FWIW, I used R-13 for my MLTL cabinets and will be removing some of it because I think the cabinet is actually over-stuffed. The 416 is one great woofer and it is a little bit of art to get it to be all that it can be in relationship to the cabinet. If it was me, I'd start with the Altec-based process and use fiberglass to see if the presentation is to your liking and experiment from there. When , or if, you get an inkling to really improve upon the Model 19 cabinet, give me a shout. The MLTL cabinets really make the 416 shine but there is a trade-off....size.
If you can get ahold of some, sheet fiberglass, sold as Owens Corning 303, is one of the better acoustic products, IMO. It is easy to install and the fibers tend to hold together better than batt fiberglass. If using glass, I would definitely cover the lot with a mesh cloth as even the hint of fiberglass particles floating around is not a good thing.
FWIW, I used R-13 for my MLTL cabinets and will be removing some of it because I think the cabinet is actually over-stuffed. The 416 is one great woofer and it is a little bit of art to get it to be all that it can be in relationship to the cabinet. If it was me, I'd start with the Altec-based process and use fiberglass to see if the presentation is to your liking and experiment from there. When , or if, you get an inkling to really improve upon the Model 19 cabinet, give me a shout. The MLTL cabinets really make the 416 shine but there is a trade-off....size.
