My SVS subwoofer is blowing out it's insulation..? - AVS Forum
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post #1 of 14 Old 10-11-2013, 11:13 PM - Thread Starter
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I have an old SVS PB2+ sub(2 12in down firing woofers with 900w Bash amp). I just moved and set up a new theater room. After watching a movie last night a large chunk of the pink insulation from inside had blown out the port hole lol. I stuffed it back in. Tonight after a movie the top was covered in pink fibers... the volume level hasn't changed, wth?

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post #2 of 14 Old 10-11-2013, 11:27 PM
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The move must have shaken things loose.. Take the amp off and go in there and put it all back in place. You can use fish net or a plastic type of chicken wire I just found out about from HD. If the insulation is shot, just buy some more and replace. There are other ways also, hot glue or twine works too.

EDIT>2-3" thick.

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post #3 of 14 Old 10-12-2013, 05:45 AM
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Quote:
Originally Posted by plissken99 View Post

a large chunk of the pink insulation from inside had blown out the port hole
Pink is usually the color of fiberglass wall insulation, which should not be used in speakers, one reason why not being what you're now experiencing. The correct fiberglass for speakers is Type 700, which is usually yellow, and is a rigid board type construction that doesn't fall apart like home insulation does. Speaker manufacturers for the most part are aware of the difference, DIYers not so much, Did you buy these new? If used perhaps the previous owner stuck it in there.

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post #4 of 14 Old 10-12-2013, 06:01 AM
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Hey Bill I have seen you bring up the 700 in the past but I have never run across it in a SW. It’s always been insulation, wool, poly or some other type of variant. I have never seen it brought up except by you. Anyway does a guy have a chance at finding the 700 at HD? It doesn’t come up in HD search and keep forgetting to check for it when I’m in there. Is the 700 more like a hard pressed wool mat, if so that sounds like a much better route to go and what might have been originally in the enclosure??

EDIT> No scratch that, I found some old pics on file and the /2 most likely did ship with reg insulation at one time although I doubt if their product does now.

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post #5 of 14 Old 10-12-2013, 07:53 AM
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Anyway does a guy have a chance at finding the 700 at HD?
It's used for the backing of vinyl faced 2x4 foot ceiling tiles, but that's only 5/8 inch thick. Thicker panels are typically used in commercial building construction, so you will find it at suppliers to that trade, which HD/Lowes aren't.

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post #6 of 14 Old 10-12-2013, 08:06 AM
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Quote:
Originally Posted by Bill Fitzmaurice View Post

It's used for the backing of vinyl faced 2x4 foot ceiling tiles, but that's only 5/8 inch thick. Thicker panels are typically used in commercial building construction, so you will find it at suppliers to that trade, which HD/Lowes aren't.

Thanks Bill!

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post #7 of 14 Old 10-12-2013, 10:16 PM - Thread Starter
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Interesting, no I bought the sub brand spanking new directly from SVS around 05 or 06. I knew it had pink fiberglass wall type insulation as I opened it up once(chasing a rattle that turned out to be something else). That is really surprising, things built like a brick ****-house otherwise. If I changed the insulation type, would that change the sound?

Would this be the right stuff? http://www.buyinsulationproductstore.com/servlet/the-487/Owens-Corning-Rigid-Fiberglass/Detail

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post #8 of 14 Old 10-13-2013, 03:20 AM
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How much dampening do you have in the /2? If it’s only a little like I suspect, you might just go another piece of what you already have in there. Your sub has been around for some time so I would think the new dampening would last the life of the sub. In a move things can happen to a sub though, so I would secure it well before you close it up if you were to consider RB insulation or whatever you decide to go with. The cost factor of dampening might be part of your consideration process as is with many. No sound should stay the same as long as you don't over do things with other options.

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post #9 of 14 Old 10-13-2013, 06:18 AM
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Quote:
Originally Posted by plissken99 View Post

Interesting, no I bought the sub brand spanking new directly from SVS around 05 or 06. I knew it had pink fiberglass wall type insulation as I opened it up once
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If I changed the insulation type, would that change the sound?
It may. The second reason why you should not use home insulation is that it doesn't work as well as other materials.
That's it, though you don't want the HVAC stuff that's foil faced.

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post #10 of 14 Old 10-13-2013, 05:24 PM
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Here is a pic of the PB13-ULTRA I came across that might be of interest to you? As you can see they/SVS are using different lining now.. just a suggestion if reg insulation is off your list, or you find the 700 cost prohibitive? In case you want to look at all the values of lining, I included a link for you that has been posted over in DIY.

http://www.bobgolds.com/AbsorptionCoefficients.htm


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post #11 of 14 Old 10-13-2013, 11:15 PM - Thread Starter
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I can't find any Owens Corning without the foil. I take it more absorption is better? In which case the 2" thick stuff would be better?

Not an audio engineer, I don't know why there is insulation in there in the 1st place.

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post #12 of 14 Old 10-14-2013, 12:54 AM
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I don't know why there is insulation in there in the 1st place.

In short reflections bassicly, some feel a little more to it than that. Also your crossover is not a brick wall, so it helps dampen mids, hence the descriptive dampening.

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post #13 of 14 Old 10-14-2013, 05:21 AM
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Quote:
Originally Posted by plissken99 View Post

I can't find any Owens Corning without the foil. I take it more absorption is better? In which case the 2" thick stuff would be better?
Two inches in a sub is about right. BTW, there's no need to go with fiberglass, open cell urethane foam and polyester upholstery batts work almost as well, both are readily available at fabric stores and department stores.

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post #14 of 14 Old 10-14-2013, 07:06 AM
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open cell urethane foam and polyester upholstery batts work almost as well, both are readily available at fabric stores and department stores.

+1 There you go. A good case can be made that DIY’rs/ID might be a con$ervative lot, but we getter done. tongue.gif

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