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Posted by Pat on February 20, 2007, 7:58 pm
>
>
>
>
> >> "RicodJour"> wrote
>
> >> Wow! Thanks for the heads-up, you guys! I'm going to do some
> >> research and find out what I need to do to make sure that the chil'n
> >> aren't kept awake at night from the audio of my nature videos. I'll
> >> probably first see how it works as-is, since it's a 6.1 system and all
> >> bass will be coming from the subwoofer. Plus, they're not bass reflex
> >> speakers, so all the sound should be pointed down. If I need
> >> soundproofing, maybe there's something I can spray inside the joist
> >> cavity? I think I'll contact the manufacturer for advice. Thanks
> >> again!!!
>
> >> - J
>
> >> > > Pat wrote:
> >> > >> I've never done in-ceiling speakers, but did you soundproof above
> >> > >> them
> >> > >> so they don't transmit sound through to the bedrooms above and keep
> >> > >> the kinder up all night?
>
> >> > > The amount of bass that can be transmitted through the floor by
> >> > > ceiling speakers is unbelievable. You have to insulate over and
> >> > > around the speaker or the joist bay will act as a huge resonator
> >> > > designed to amplify bass - a drum. It is also a good idea to use
> >> > > dense rubber mounting blocks under the retaining screw wings and a
> >> > > foam gasket between the ceiling and the mounting flange.
>
> >> > The biggest problem, in my opinion, with built-in speakers is the loss
> >> > of
> >> > the *sweet spot*.
>
> > As Don mentions in a post, the speakers are make for this so it isn't
> > like installing a car speaker in the wall, but still, all you have is
> > the subfloor and maybe a rug between you and the upstairs. Rico's
> > mentioning the use of rubber washers in a good ideal. At a minimum,
> > make sure that nothing is screwed solid into the wood. You want to
> > use rubber or something to insulate the speakers from the house.
>
> The gaskets are fine for isolating the vibrations but there is no way to
> stop the sound from transferring through that 3/4" plywood flooring, even if
> it has tile on top of it.
> Steel cases with baffles like I had will help but its still going to occur.
> For a ceiling installation, with a sleeping room above, I'd go with surface
> mount speakers and fill the joist cavity above with sound absorbing material
> (expensive, seewww.crutchfield.com).
> If the room in question has an 8' ceiling this is probably not an option.
My house is plaster and lathe, so I wouldn't worry too much about
surface mounted speakers -- you could set off a small bomb in one room
and not hear it in the next. But sheetrock is a different story, but
I agree, I would surface mount them -- but it's too late for that. He
said it's too hard to make a hole smaller so patching it would be out
of the question ;-)
I would surface mount them and use something like the rubberized mouse-
pad material in isolate the speaker from the wall.
But if he's stuck with what he's got and he's not willing to burn it
down and do it right this time (again), then maybe he should either
stuff it full of fiberglass or spray it with foam insulation.
He might also want to put a brick or something up through the hole to
put a load on the sheetrock so it doesn't act like a large sound-
board. I don't know. I guess this is why you get pro installation.
Hey, better yet, maybe he should check and see what the architect
spec'd.
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