Memory Foam vs Dacron for Speaker Stuffing

[varun21]

I have two pairs of cabinet ready and yearning to get the drivers hooked up. All 4 cabinets are sealed. (A pair of Philips HQ4814 in the floorstanders; JBL GTO1214D in one cu feet each) But I've been delaying it because there's this decision to be made.

http://www.diyaudio.com/forums/full...-differences-poly-fill-types-post2581375.html

Says that Memory Foam is the best material. Question is

1) How good is Dacron as compared to Memory Foam.

2) Should I need lining on the internal walls when using memory foam?

Thanks for helping me out here.

 

[xrk971]

Try BASF professional sound abatement foam (reticulated bakelite) - aka, "Mr Clean" magic cleaning erasors. Works very well. Can also be found as off-brand (local supermaket) for less sometimes. I got a box of 1 dozen for $6 once, for example:

Harris Teeter Disposable Erasers 12.00 ct Harris Teeter

 

[CharlieLaub]

I believe that memory foam is a closed cell foam. So you can put in slabs of it, but you will reduce the cabinet volume by the same amount.

 

[xrk971]

Yes, you want open cell foam as to not change cabinet volume.

 

[varun21]

Memory Foam is made of Polyurethane (Memory foam - Wikipedia)

Open-cell foams feel soft and allow air to flow through, so they are comfortable when used in seat cushions or mattresses. Closed-cell rigid foams are used as thermal insulation, for example in refrigerators.

(Polyurethane - Wikipedia)

The closest shop has pillows available (which the article indicates is open cell). I don't want to cut across mattresses and sheets are not available.

…This brings me to viscoelastic foam. You’ll sometimes see viscoelastic foam referred to as “open-cell” foam, but it’s important to realize that both flexible polyurethane foam and viscoelastic foam are open cell. All foam used in mattresses are open cell…

(What You Need To Know About Polyurethane Foam and Memory Foam | Sleepinglikealog.com)

So am I assuming that it's open cell?

 

[starkeyg]

Hello,

From Wikipedia:

The temperature-sensitive memory foam was initially referred to as “slow spring back foam”; Yost called it "temper foam".[2] Created by feeding gas into a polymer matrix, the foam has an open-cell solid structure that matches pressure against it, yet slowly springs back to its original shape.[3]

So it seems it is open cell foam.

 

[varun21]

They have a patent for the manufacturing of this pillow material. Saw it on the packing. Led me to this where it mentions open cell: Indian Patents. 219746:METHOD OF MANUFACTURING VISCO ELASTIC FOAM PILLOW

So I guess the only question are:

1) How good is Dacron as compared to Memory Foam.
2) Should I need lining on the internal walls when using memory foam?

 

[starkeyg]

Hello,

Not sure I want my speakers to have a memory... 🙂

Sorry, couldn't resist.

Greg