do I take this as dampner ?

[busterno1]

I am planing on lining a set of boxes I am making with a liquid tar .

Also known as blackjack it is used in cars as a sound proofing or to fix leaks in gutters .
Do I take this into account as damping in a ported box or just line it as normal.

The tar takes the ring out of mdf

[eStatic]

I have heard that the solvent in this kind of stuff can be hazardous to your drivers. Hopefully some one more knowledgeable than myself will reply to your post.

[sreten]

The solvent is hazardous to drivers, a good setting time is needed.

The same stuff ipreganated into felt layers is used for damping pads.

A less messy option is the thinnest and cheapest vinyl floor tiles you can find.

Wall damping is not acoustic damping, they still need foam damping.

sreten.

[Timn8ter]

How about this?

[sreten]

mineral filled asphalt polymer

Sound suspiciously like cheap vinyl floor tiles, which have lots of filler,

sreten.

[maylar]

The car audio guys are constantly on the lookout for dampening materials that are cheaper than the commercial Dynamat stuff. One popular alternative is "Peel & Seal" or equivalent roofing material available from home centers.

[kingdaddy]

I used Leak Stopper on several of my projects, it’s a Rubberized penetrating Tar slurry that dampens very well and it has not hurt my drivers, although I do allow at least a few days of curing before I put drivers in the enclosure.


http://www.apoc.com/Gardner-5-02/ga-leakstopper.htm

[Svante]

Originally posted by busterno1
I am planing on lining a set of boxes I am making with a liquid tar .

Do I take this into account as damping in a ported box or just line it as normal.

The material you describe will probably add very little *acoustic* damping, so you can probably ignore the effect from the tar on the acoustic properties of the cavity. You will need some mineral wool or similar too.
For the killing mechanic vibration it will probably have a much larger effect, as you already have realised.

[SY]

Filler can be a GOOD thing. For one thing, they provide mass loading (fillers will normally have higher density than organic resins). A mix of chopped fiber and mineral in a lossy plastomer matrix can be very effective in higher frequency vibration damping. Larger scale panel bending modes are best dealt with in more direct ways like bracing and reinforcement.

[Tiggerfip]

I have used these sheets from McMaster for lining my interior car door panels. They have other products in the 3260 to 3275 page range that are useful as well but for vibration dampening the viscoelastic asphalt sheets with self adhesive backs are great price. Before I found them everyone who did not want to spend for Dynamat used Ice and water shield (used as underlayment on roofs in cold climates).

http://www.mcmaster.com/pdf/110/3270.pdf

The Parts Express item looks very similiar - I wish they would state the DLF on the sheets they sell. It looks like the Polymeric mastic sheets from McMaster - same size, thickness etc.

They also have the 5 layer single and duel layer lead sandwich products if you have the money to spend but they are more useful for noise transfer in cars versus speakers.

Oh yea - and if you are looking for a vibration dampener in a can there are quite a few products for that as well - specifically designed to bond and dampen. Noisekiller, Quietcote, etc... - I can not remember which one I used.

I also found this web site through random searching about sound/noise/vibration products. You might find something useful there.

http://home.att.net/~rcp-conseaco/links.htm