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#296928 - 03/16/10 06:28 PM Any Idea's on How to Stiffen Up a Projector Mount
SRoode Offline
connoisseur

Registered: 03/20/08
Posts: 1278
Loc: Fishers, Indiana, USA
And let's get this out of the way... I don't mean rub it or play X-Rated movies ;\)

Since I've had the EP800s, I've noticed that my projector shakes a lot during LFE effects, and it is very distracting. I have a Panasonic PT-AE3000U projector and one of those ceiling mounts that is center oriented with 4 connections to the projector. I was thinking of possiblly adding rods to the 4 corners of the projector, tight against the ceiling. It's kind of weird because the speakers are sitting on the concrete foundation of the house, and the projector mount is bolted to a structural beam, so the only way it is shaking is from the air pressure, not from vibrations transferred through the floor.

Any help would be greatly appreciated!
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#296929 - 03/16/10 06:34 PM Re: Any Idea's on How to Stiffen Up a Projector Mount [Re: SRoode]
EFalardeau Offline
connoisseur

Registered: 08/27/07
Posts: 3400
Loc: Laval, Quebec, Canada
Mark should be along soon with ideas on how to get bass to cancel for your screen using square roots... square rooms...
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#296930 - 03/16/10 06:34 PM Re: Any Idea's on How to Stiffen Up a Projector Mount [Re: SRoode]
Potatohead Offline
aficionado

Registered: 05/14/09
Posts: 670
Loc: Vancouver
What kind of mount do you have? Is it two seperate pieces, one that bolts to the projector and another to the ceiling, and you lock them together? I have that style and I have no issues at all.

Maybe try some blue loc-tite on all the bolts on the mount (not the ones into the projector!!) and see if that helps at all, although it may not if the mount bolts are not actually coming loose.

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#296933 - 03/16/10 06:42 PM Re: Any Idea's on How to Stiffen Up a Projector Mount [Re: Potatohead]
SRoode Offline
connoisseur

Registered: 03/20/08
Posts: 1278
Loc: Fishers, Indiana, USA
It is 2 separate pieces, but it is pretty tight. After many hours watching, even with the vibration, the projector is still aimed perfectly at the screen. If it were loose, I think it may have eventually slipped a bit. I had the same style when I had my Panasonic PT-AE900U and my EP500s and there was never an issue, but the PT-AE-3000U is quite a bit bigger (side to side) and the new subs put out more bass.
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2 M80s, 1 VP180, 4 QS8s, 2 EP800s, 4 Algonquins, 2 M3 VaSSallos, 1 AxiomAir N3

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#296935 - 03/16/10 06:48 PM Re: Any Idea's on How to Stiffen Up a Projector Mount [Re: Potatohead]
Adrian Offline
axiomite

Registered: 12/27/08
Posts: 6888
Loc: It's all about the location.
For the record, I don't own or know much about projectors...BUT!!...would it not be prudent to isolate the projector somehow with something like rubber pads/grommets/gasket kind of the way you might do to your speakers sitting on the floor. I realize this is caused by air pressure, but it still might help as well as firming up the supporting structure. Could it be the sound pressure acting on the floor beams....then to the projector?...maybe some pads might help to isolate it.
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#296976 - 03/16/10 10:34 PM Re: Any Idea's on How to Stiffen Up a Projector Mount [Re: SRoode]
pmbuko Offline
shareholder in the making

Registered: 04/02/03
Posts: 16437
Loc: Ben Lomond, California
If your projector mount is rated for more weight than it's currently holding, I would try adding weight to deaden the vibrations. You can test out the theory by securing a heavy book or two to the mount with bungie cords or cam straps. You'll get more dampening if you hang the weight beneath the projector, but it might not be feasible.
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#296979 - 03/16/10 10:40 PM Re: Any Idea's on How to Stiffen Up a Projector Mount [Re: pmbuko]
Adrian Offline
axiomite

Registered: 12/27/08
Posts: 6888
Loc: It's all about the location.
 Originally Posted By: pmbuko
You can test out the theory by securing a heavy book or two to the mount with bungie cords or cam straps.

I would suggest Floyd Toole's "Sound Reproduction" to start with.

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Half of communication is listening. You can't listen with your mouth.

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#296993 - 03/16/10 11:44 PM Re: Any Idea's on How to Stiffen Up a Projector Mount [Re: Adrian]
SirQuack Offline
shareholder in the making

Registered: 01/29/04
Posts: 13572
Loc: Iowa
If your projector is attached to the ceiling joists there is not a lot you can do in my opinion. I have a DIY mount using cast iron steel attached across the ceiling floor joists in my basement. I get the occasional shaking from my subs, as well as when the kids are jumping upstairs. Provides a realism to action movies. \:\)
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#298298 - 03/24/10 04:15 PM Re: Any Idea's on How to Stiffen Up a Projector Mount [Re: SirQuack]
Zimm Offline
connoisseur

Registered: 12/08/08
Posts: 1361
Loc: New Orleans
I think your best bet is to isolate the mount from the ceiling and bolts. Put neoprene (sp?) between ceiling and any contact points, and put thick soft gaskets or neop on floor side of the anchor bolts.

50/50 chance it gets better. But anchoring it more tightly I thinks is a hard road, unless it is really loose right now. With that much SPL, you won't get all the shake out of the structure, so you have to isolate.
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#298368 - 03/25/10 01:30 AM Re: Any Idea's on How to Stiffen Up a Projector Mount [Re: Zimm]
dakkon Offline
connoisseur

Registered: 02/08/04
Posts: 1863
I would say the weight idea also.. I would make a mold of the top of the projector, and get some led, and melt it so that I would have a good fit with some double sided tape.

the bolt idea that Zimm said, will most likely not work due to the bolt going though the stud, and then to the projector, so the bolt will still be a sound or vibration short.

you would need to do something similar to a motor mount, with 2 studs that go into a common rubber mount, but the 2 studs are not physically touching. something like this.

http://www.rubber-group.com/isolationmounts.html

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