Acoustic Sound Damping Foam 1-1/2" x 24" x 18" UL 94

Specially designed, opened cell, flame retardant foam in a convoluted, "egg crate" pattern. Flame retardant in accordance with UL 94 HF-1 flammability testing. Sold individually in 24" x 18" pieces.


  • Great for acoustical damping inside speaker enclosures
  • Perfect for sound control in small recording studios
  • Flame retardant in accordance with UL 94 HF-1 flammability testing
  • Sound Absorbing Acoustical Foam
Part # 
Weight: 0.45 lbs.  
List Price$12.99
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Buy 16-31 $7.45
Buy 32-up$6.57
Part # 260-516
Qty:  EA
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Product Details

Acoustic Sound Damping Foam 1-1/2" x 24" x 18" UL 94
This 1-1/2" acoustic foam with "eggcrate" pattern helps to reduce muddy bass and cleans up the midrange by absorbing internal standing waves. Staple or glue to the top, bottom, sides, and back of the inside of your speaker cabinet. You will be amazed at what soundproofing acoustic foam can do for your system. Also ideal for controlling reflected sound in small recording rooms and studios. This sound absorbing acoustical foam is flame retardant in accordance with UL 94 HF-1 flammability testing, and sold individually in 24" x 18" pieces. Charcoal gray color. WARNING: This product contains a chemical known to the State of California to cause cancer, or birth defects or other reproductive harm.

Acoustic Sound Damping Foam 1-1/2" x 24" x 18" UL 94
  • BrandParts Express
  • Part Number260-516
  • UPC844632037412
  • Product CategoryAcoustic Wall Treatments
  • Unit of MeasureEA
  • Product Rating
    (35 Reviews)
  • Weight0.45 lbs.
  • California Prop 65

    Warning: California residents only. Please note per Proposition 65 that this product may contain chemicals known to the State of California to cause cancer and birth defects or other reproductive harm.


Acoustic Sound Damping Foam 1-1/2" x 24" x 18" UL 94
Acoustic Sound Damping Foam 1-1/2" x 24" x 18" UL 94 is rated 4.5143 out of 5 by 35.
Rated 5 out of 5 by from Good StuffI am installing an in wall/ceiling surround sound system and I decided to seal up the cavities. I purchased this material along with the adhesive and I'm really glad I did, easy to work with and I expect nice results.
Date published: 2014-04-07
Rated 5 out of 5 by from Electric Knife cuts it betterI've used this in a lot of speakers and have always been glad I spent the time to dig out the electric knife. Actually saves time in the long run and leaves a nice clean cut.
Date published: 2014-03-18
Rated 5 out of 5 by from It works!Does what it supposed to do - my speakers sound great.
Date published: 2013-09-02
Rated 5 out of 5 by from Does its job.I used this to make a vocal reflection filter. The foam is nice and think, and fit perfectly with my project. There was little or no odor whatsoever that I noticed. It does a good job of reducing some of the rooms reverb in my recordings.
Date published: 2013-04-20
Rated 5 out of 5 by from This stuff really works!I wonder what this stuff will look like in thirty years. Other than that, it works great to reduce unwanted resonance in my custom speaker!
Date published: 2012-06-11
Rated 4 out of 5 by from Easy to cut, install, use in subwooferUsed this to line the inside of my old Cambridge Soundworks BassCube 12 - which had some polyfill and that was it! More warm sound now with foam and new SA-240B amp installed. Cuts easily with a sharp utility knife.
Date published: 2012-11-19

Product Q&A

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If your question requires design or troubleshooting information,
please email tech@parts-expresss.com  for a prompt reply.
Acoustic Sound Damping Foam 1-1/2" x 24" x 18" UL 94

i dont get why i need this in speakers?

i want to get the most of out my speakers.. and wheres the best place in the speakers to put them?
Asked by: brandon89lee
Acoustic foam like this does two things:First, it makes the woofer or woofers think the box is bigger, by slowing down the back wave inside the box. The actual method is pretty complicated physics stuff, but just imagine the sound wave takes longer to travel through the foam, making it seem like the box is larger. This will ultimately lower the tuning (lower bass) a little bit and clean up sloppy midbass and bass.It also acts as a deflector, due to the convoluted surface of the foam. Higher frequencies will reflect off of the eggshell pattern and scatter all over the box, which helps cancel resonances and standing waves, which will result in a cleaner midbass/lower midrange.As for where to put it and how much depends on what kind of speakers you have. Usually at least behind the woofer and the sides of the box if you can. If your cabinet is sealed (acoustic suspension), you can pretty much put it anywhere, the more the better. Just make sure it isn't touching the cone of your woofer or anything. If your box is ported, you can put it most anywhere as long as it doesn't come too close to the port. The rule of thumb is the same distance away from the port on all sides as the port is big. For example, if you have a 2.5" diameter port, keep all foam/stuffing at least 2.5" away from all sides of the port, and make sure you don't put too much in, or it will drastically change the tuning of the port/box.Hope that helps.
Answered by: XLR8R
Date published: 2013-09-22

Which product for deep bass?

Effectiveness varies with frequency. Not all products are good in the deep bass. The absorption (damping) of most foams is less at lower frequencies. Which foam offers the best relative absorption under 60 Hz -- relative to what it does at higher frequencies? Thanks, this matters!
Asked by: HensBestEffort
We don't have any foam products that will absorb 60 Hz or below. The foam required to do this would be many feet thick and its impractical.
Answered by: MattP
Date published: 2012-11-19

good for bookshelf speakers?

I have a pair of Dayton Audio B652 6 1/2" bookshelf speakers and i would like to bring out some extra bass and get rid of unwanted peaks. Is this the right product for me? Also, i figure you would have to take out any filler that already exists in the cabinet, and that makes me wonder if i am messing with the "acoustics" too much. So overall, would this be a positive or negative effect on the quality of the sound of these speakers?
Asked by: Dave B
Dave,I have used the egg-crate foam from Parts Express on many vintage speakers, including EPI-100's, Dali III's & Large Advents. In each case I fitted the foam to top, bottom, sides and back w/ an appropriate cut-out for the crossover. Everytime the speaker's bass really solidified. Deeper, rock solid, no booms and well integrated with the other drivers. I can't recommend this treatment too highly. Note: I cut the pieces easily with a bread knife, and carefully fit them into the cabinets without using adhesive. Hope this helps.Paul
Answered by: UrLord
Date published: 2013-08-26

Is this a flexible foam? Can I glue it to a curved surface?

I need to line a curved area, rather than glue the foam to the interior of a box. Is this flexible enough to do that with? Thanks very much.J
Asked by: Jmpurchase22
Yes, this is a soft flexible foam rubber type foam. It will easily bend, fold and contour.
Answered by: XLR8R
Date published: 2012-12-19

Glue to ABS sheet?

I suppose it can be glued to ABS sheets? What glue do people use? Would double sided tape work? Thanks!
Asked by: A Parts Express shopper
I would recommend a spray adhesive like below. Double sided tape will probably not stick well enough to the foam to hold it for a very long period of time.
Answered by: MattP
Date published: 2012-11-16

What about singing late at night without disturbing others?

If I were to buy a number of these foam pieces to make some sort of vocal booth, would my parents still be able to hear me? My studio is in the basement and they sleep upstairs. I woke them up a couple of times so I am hoping using a foam booth will absorb the noise.
Asked by: nightrocker
This will prevent room reflections but unfortunately I don't think it will affect sound outside the room enough to justify the cost. This is usually something that is considered when the room is designed. Soundproofing is not easy to retrofit.
Answered by: MattP
Date published: 2013-03-12

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