Good Morning,
I am finishing plans for a large built-in entertainment center. This will hold 2 fairly large bookshelf speakers (to be placed on bookshelves) and the largest center channel speaker I have ever seen.
Here is my question: In a 2002 FWW article by Brooks Tanner “Engineering an Entertainment center” he creates a lamination of MDF and hardboard for the shelves which hold speakers to deaden the vibrations.
Has anyone else done this or something similar?
Mr. Tanner are you out there?
Thanks, TWG
Replies
No, I haven't, but I would do something different anyway. MDF sags more than ply, so I'd avoid MDF as a shelf. If I laminated hardboard to MDF, I'd be sure to glue it all up in a veneer press to gain as much rigidity as possible.
The second thing I would look at is whether the shelf the speaker on really needs to be adjustable. Permanent shelves are more rigid and probably won't vibrate as much as an adjustable shelf.
"...to gain as much rigidity as possible."
That kind of defeats the purpose in this application. The reason for using MDF is that it is acoustically "dead"--it's very unrigid at audio frequencies.
-Steve
My concern about rigidity is an adjustable shelf vibrating around on the pins, as well as preventing sag. If these are big speakers, I'd be worried more about sag than harmonics. There are ways to dampen vibration while maintaining a straight shelf line.Recommending the use of "Hide Signatures" option under "My Preferences" since 2005
These shelves will not be adjustable, but I agree that adjustable shelves would cause more problems.
Thanks everyone for the input so far.
TWG , Maybe you could use some type of neoprene or padding / carpet / foam
on the shelf surface ?
dusty
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