Soundproofing Conduit? - AVS Forum
Forum Jump: 
 
Thread Tools
Old 06-17-2011, 07:40 AM - Thread Starter
 
cybrsage's Avatar
 
Join Date: May 2007
Location: Harrisburg, PA
Posts: 8,074
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Liked: 150
I did a search, but found nothing...

I am going to be running conduit from the underside of my stage where my electronics will be located, up through the front wall (behind the screen), across the ceiling, and stopping where the projector will be located (at about 18 feet from the screen). How do I prevent this hole in my ceiling from transmitting sound to the other side of my ceiling?

I am using hat channel, whisper clips, and double drywall with green glue on the ceiling...then I am cutting a two inch hole in that ceiling and running a conduit through it! That ceiling is the floor of the living room. I will put the conduit underneath the insulation to help remove the sound..but what else can I do? I was thinking of plugging both ends of the conduit with acoustic sealant after I ran my cables. I can always cut it away if I need to run more cables or such.

What else can I do to minimize the sound transfer?
cybrsage is offline  
Sponsored Links
Advertisement
 
Old 06-17-2011, 07:53 AM
AVS Special Member
 
Ted White's Avatar
 
Join Date: May 1999
Location: Michigan, USA
Posts: 8,187
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 4 Post(s)
Liked: 35
The 2" diameter hole isn't such a hazard. Have the insulation positioned as you described. Rigid conduit will transmit more vibration out via conduction, so consider flexible conduit when possible.

__________________

Ted



The Soundproofing Company
Ted White is offline  
Old 06-17-2011, 07:56 AM - Thread Starter
 
cybrsage's Avatar
 
Join Date: May 2007
Location: Harrisburg, PA
Posts: 8,074
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Liked: 150
Thanks, I am using flexible, low voltage conduit. Should I even bother sealing the ends like I described? Should I just shove a little insulation into the hole instead?

I feel a bit better now.
cybrsage is offline  
Old 06-17-2011, 07:58 AM
AVS Special Member
 
Ted White's Avatar
 
Join Date: May 1999
Location: Michigan, USA
Posts: 8,187
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 4 Post(s)
Liked: 35
There is removeable caulk available. A bit brittle, but it works. Some insulation is also OK as you suggested.

__________________

Ted



The Soundproofing Company
Ted White is offline  
Old 06-17-2011, 10:01 AM
HOME THEATER CONTRACTOR
 
BIGmouthinDC's Avatar
 
Join Date: Jan 2003
Location: Northern VA
Posts: 21,502
Mentioned: 10 Post(s)
Tagged: 1 Thread(s)
Quoted: 579 Post(s)
Liked: 738
Kill two birds with one stone. Add a piece of 5/8 plywood in the projector mount location instead of the first layer of drywall and then add backer boxes for the outlet and conduit connections.

see this discussion:

http://www.avsforum.com/avs-vb/showt...2#post20234072
BIGmouthinDC is online now  
Old 06-17-2011, 10:05 AM
AVS Special Member
 
Ted White's Avatar
 
Join Date: May 1999
Location: Michigan, USA
Posts: 8,187
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 4 Post(s)
Liked: 35
For a 2" hole, the backer box is a bit overkill. I like overkill as much as the next guy, however, and it certainly won't hurt anything at all.

__________________

Ted



The Soundproofing Company
Ted White is offline  
Old 06-17-2011, 11:08 AM
Member
 
npc2396's Avatar
 
Join Date: Oct 2004
Location: Avon Lake, Ohio
Posts: 170
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Liked: 10
Quote:
Originally Posted by BIGmouthinDC View Post
Kill two birds with one stone. Add a piece of 5/8 plywood in the projector mount location instead of the first layer of drywall and then add backer boxes for the outlet and conduit connections.

see this discussion:

http://www.avsforum.com/avs-vb/showt...2#post20234072
I just did this for the projector mount and it worked out great. I used the zip style metal anchors with 1/4" bolts that seemed more secure than lag bolting.
npc2396 is offline  
Old 06-17-2011, 12:09 PM - Thread Starter
 
cybrsage's Avatar
 
Join Date: May 2007
Location: Harrisburg, PA
Posts: 8,074
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Liked: 150
I am going to just nail up a bunch of 2x4 chunks between the ceiling joists to screw the projector onto. Is this bad?
cybrsage is offline  
Old 06-17-2011, 12:11 PM
AVS Special Member
 
Ted White's Avatar
 
Join Date: May 1999
Location: Michigan, USA
Posts: 8,187
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 4 Post(s)
Liked: 35
It will couple the ceiling to the joists. Not advised

__________________

Ted



The Soundproofing Company
Ted White is offline  
Old 06-17-2011, 01:16 PM - Thread Starter
 
cybrsage's Avatar
 
Join Date: May 2007
Location: Harrisburg, PA
Posts: 8,074
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Liked: 150
Ah, did not think of that...makes the whisper clips worthless then. Plywood it is!
cybrsage is offline  
Old 06-17-2011, 03:36 PM
Member
 
michaelstrunk's Avatar
 
Join Date: Sep 2009
Posts: 60
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Liked: 10
What about vibration attaching the projector as part of the decoupled ceiling? Or does that not really matter.

I love it when someone else starts the exact same thread question I was about to start.

Mike
 

michaelstrunk is offline  
Old 06-17-2011, 04:31 PM
HOME THEATER CONTRACTOR
 
BIGmouthinDC's Avatar
 
Join Date: Jan 2003
Location: Northern VA
Posts: 21,502
Mentioned: 10 Post(s)
Tagged: 1 Thread(s)
Quoted: 579 Post(s)
Liked: 738
There are a few sources of projector vibration.

First if the projector is secured to the ceiling framing anyone walking over the area will shake projector.

If the projector is attached to the decoupled ceiling enough bass might shake the projector. But if you use two layers of 5/8 it will be pretty hard to shake.

Some projectors have been reported to experience vibration of the front lens from intense base.

You can mount the projector to the ceiling framing and still keep the drywall decoupled if you pass steel rods through the drywall in holes bigger than the rods and fill the gaps with flexible caulk. You then need to fashion some kind of plate floating below the ceiling to attach the mount.
BIGmouthinDC is online now  
Old 06-17-2011, 05:30 PM
Senior Member
 
uscmatt99's Avatar
 
Join Date: Apr 2010
Posts: 311
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 2 Post(s)
Liked: 13
I'm running into projector shaking with heavy bass scenes. My room has totally decoupling of the walls and ceiling. I can only assume that the walls/ceiling are flexing with bass pressurization since the room is fairly well sealed. Has anyone tried decoupling some blocking from the drywall and room framing, within the room, using DC-04 clips? I was thinking this could at least dampen the vibrations to the PJ somewhat.
uscmatt99 is offline  
Old 06-18-2011, 08:21 AM - Thread Starter
 
cybrsage's Avatar
 
Join Date: May 2007
Location: Harrisburg, PA
Posts: 8,074
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Liked: 150
Quote:
Originally Posted by uscmatt99 View Post

I'm running into projector shaking with heavy bass scenes. My room has totally decoupling of the walls and ceiling. I can only assume that the walls/ceiling are flexing with bass pressurization since the room is fairly well sealed. Has anyone tried decoupling some blocking from the drywall and room framing, within the room, using DC-04 clips? I was thinking this could at least dampen the vibrations to the PJ somewhat.

That is a thought! I might try it.
cybrsage is offline  
Old 06-20-2011, 02:06 PM
AVS Special Member
 
kromkamp's Avatar
 
Join Date: Jun 1999
Location: Toronto,Ontario,Canada
Posts: 4,411
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 13 Post(s)
Liked: 26
I ran 2 new staggered joists across the decoupled stud walls so that I could mount plywood directly to them. (I also did the same for my screen).
kromkamp is offline  
 
Thread Tools


Forum Jump: 

Posting Rules  
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off