Damping Material Installation

[omni]

What is the best, most secure method to attach Acousta Stuf to the inside walls of my speaker cabinets....Cabinets will be 4 cubic feet, sealed.......Any experience and guidance will be greatly appreciated...............Omni

[Cal Weldon]

If you are concerned that you can't get a friction fit, you can always use a retainer. An old pillow slip or pair of nylons can be tacked in place to hold the insulation. You can also use the plastic screen from windows or W.H.Y. These will be fastened top and bottom to act as a "wall" so as not to compress the stuffing

[Lsharptec1]

Omni,

Acousta-Stuf is one of the most homogenous loose bulk fiber damping materials. The fibers tend to interlock together to form a cohesive mass.

In many smaller enclosures, simply stuff the desired amount of fiber through the woofer hole, and install the woofer.

Acousta-Stuf will usually stay where is placed, unless a huge amount of it is used.

Acousta-Stuf can be attached to enclosure walls by a couple of different methods:

1. Use 3M 77 or equivalent spray adhesive to attach wads of the fiber to an internal wall.

2. Staple Acousta-Stuf to a wall using a layer of loose weave furniture cloth.

FYI, Acousta-Stuf is NOT a Dacron fiber. It is a tri-lobal shaped nylon polyamide fiber, multi-directionally crimpped to make the strands lock together.

However you attach it, Acousta-Stuf damping fiber clean up all of those pesky midrange resonances that tend to blur the acoustic image of your speaker system.

Larry

[roddyama]

I've never used Acusta Stuf before but if I wanted to hold insulation in place or separate it from the driver, I typically use cheesecloth. It's easy to work with, easy to find, not too expensive, and is well suited to this application. If you roll the edge a couple times, you can easily attach it to the inside of the box with a staple.

[omni]

Thank you all for your valuable input..............I opened the bag { 5 lb. } and found that it was not in sheet form, that it was in loose wad form, which kinda suprised me.......Lsharptec1, will the spray adhesive dry out over time or will it maintain its' adhesive qualities ?............I got a few cabinet things to do before I install the damping, so it will be a couple of days yet.............Respectfully......Omni

[Lsharptec1]

Omni,

3M 77 spray adhesive is used extensively in the loudspeaker industry.

It will eventually dry, but the hold last for a very looooonnnng time.

Larry

[omni]

Lsharptec1............I have a can of the super 77 3M, I use it for printing T shirts................If I use it to attach my AcustaStuf, do I use the instructions for permanent adhesion, whereby I spray both surfaces { cabinet wall and AcoustaStuf }, let dry, then press together?..................Or is there another preferred method?............Also, do you prefer this method to using staples ?............Respectfully...........Omni.......... ...How heavy of a spray do you use with this ?............

[Lsharptec1]

Omni,

No need to spray the wall and the fiber ...

I always just spray the internal wall surface, and wait a few minutes for it become tacky. Then press wads of the Acousta-Stuf against the adhesive.

Since the fiber is very cohesive, the wads will not fall apart.

Good luck.

Larry