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Cabinet Damping: Wool, Foams, Felts & Bitumastic Sheet:



Loudspeaker damping materials Loudspeaker damping materials

    There are many types of materials which can be used to modify or dampen the mechanical or acoustical performance of a Loudspeaker cabinet. These range from relatively light materials, like polyester pile or wools, to heavy and acoustically dead materials like bitumastic. The lighter compositions, have complicated interactions with the acoustics, but ultimately convert internal cabinet pressure-waves into heat, thereby reducing the signal level. These interactions occur over a relatively small frequency range. The heavier materials, like bitumastic, form the basis for mechanical panel damping and can be selectively applied to internal loudspeaker walls to reduce the level of live panel vibrations. Felts offer characteristics which fall midway between the two extremes.
    Below you will find a selection of materials which offer a range of differing characteristics and which are able to be applied easily in a DIY environment.

Loudspeaker damping materials Article

Sound Absorbent Foam
(1) Sound Absorbent Foam. 

* 16mm closed cell Foam Sheet.

     Sound absorbent foam is an ideal contender for damping the higher frequencies in speaker enclosures. Coloured grey, it has a closed cell construction, is easy to bend / fit into a variety of loudspeaker enclosures and may be cut to shape using a sharp scalpel. This sound absorbent foam provides a cost-effective and clean method of installing speaker enclosure damping to your home project. Nominal thickness 16mm. Supplied in rolled sheet format, 550mm * 1200mm = 1 piece.

* Sound Absorbent Foam Sheet, 16mm thick.

Order Code Description: Foam Sheet. Pack Size Price 1+ Price 6+ Pk Wt gms
DAMPFOM1 (550*1200*16)mm 1 7.01 /ea 6.68 /ea 323
 
Herdwick Sheeps Wool
(2) Herdwick Sheeps Wool. 

* Sheeps Wool.

    Genuine British, scoured Herdwick Blend, Sheeps Wool. Cleaned / washed but not mothproofed, this is the upgrade to polyfill and other synthetic type fillings. Ideal for stuffing your loudspeaker cabinets and ideally suited for transmission line stuffing. Available in 250gm and 500gm packs. As a general guide, 250gms of wool stuffing will be sufficient per 1 cubic foot of stuffed volume or 28L, whichever you like. Of course you can use more or less as required.

* Herdwick Sheep's Wool, Loose, Ideal for Cabinet Stuffing and TL's.

Order Code Description: Sheep's Wool. Pack Size Price 1+ Price 6+ Pk Wt gms
SHPWOOL1 Herdwick Wool, 250gms Pack 1 4.45 /pk 4.24 /pk 250 / pk
SHPWOOL2 Herdwick Wool, 500gms Pack 1 8.66 /pk 8.25 /pk 500 /pk
 

Felt Damping Material
(3) Sound Absorbent Felt. 

* Sound Absorbent Felt.

    Used for damping the internal resonances and reflections in loudspeaker enclosures. This speaker felt is of a mat wool and composite material construction, 80% recycled wool, 20% cotton mix. The sound absorbent felt is supplied in two material weights 1700gms or 1100gms per square metre. Nominal thickness is 10mm or 7.5mm uncompressed. Supplied in rolled / sheet format. See below for sizes.

* Recycled 80% Wool, 20% Cotton mix Felt, 10mm thick.

Order Code Description: 10mm wool cotton mix. Pack Size Price 1+ Price 6+ Pk Wt gms
DAMPFLT1 Loudspeaker Felt (300*700*10)mm 1 1.70 /ea 1.62 /ea 360
DAMPFLT11 Loudspeaker Felt (300*1400*10)mm 1 3.39 /ea 3.22 /ea 720
DAMPFLT12 Loudspeaker Felt (500*1400*10)mm 1 5.68 /ea 5.40 /ea 1200
 

* Recycled 80% Wool, 20% Cotton mix Felt, 7.5mm thick.

Order Code Description: 7.5mm wool cotton mix. Pack Size Price 1+ Price 6+ Pk Wt gms
DAMPFLT2 Sound Absorbent Felt (300*700*7.5)mm 1 1.48 /ea 1.41 /ea 226
DAMPFLT21 Sound Absorbent Felt (300*1400*7.5)mm 1 2.96 /ea 2.81 /ea 452
DAMPFLT22 Sound Absorbent Felt (500*1400*7.5)mm 1 4.95 /ea 4.70 /ea ******
 
100% Sheeps Wool Damping Felt
(4) 100% Sheeps Wool Felt. 

* 100% Pure Herdwick Sheeps Wool Felt.

     NEW additions to our felt range. This felt is 100% pure Herdwick Sheeps Wool felt. Now supplied in three felt weights of (35, 42 & 48)oz per square yard. The measured thicknesses are notional and uncompressed. When cut and bent / flexed the thickness tends to expand. Provides an improved performance substitute over recycled wool / cotton felts.

* Pure Wool, sound absorbent felt. 35oz / sq yd. Thickness 12mm.

Order Code Description: Pure Herdwick Wool Felt. Pack Size Price 1+ Price 6+ Pk Wt gms
DAMPFLT4 Pure Wool Sound Absorbent Felt (300*685*12)mm 1 3.22 /ea 3.06 /ea 244
DAMPFLT41 Pure Wool Sound Absorbent Felt (300*1370*12)mm 1 6.23 /ea 5.92 /ea 488
DAMPFLT42 Pure Wool Sound Absorbent Felt (500*1370*12)mm 1 10.53 /ea 10.00 /ea 675
 

* Pure Wool, sound absorbent felt. 42oz / sq yd. Thickness 13mm.

Order Code Description: Pure Herdwick Wool Felt. Pack Size Price 1+ Price 6+ Pk Wt gms
DAMPFLT3 Pure Wool Sound Absorbent Felt (300*685*13)mm 1 3.37 /ea 3.20 /ea 293
DAMPFLT31 Pure Wool Sound Absorbent Felt (300*1370*13)mm 1 6.74 /ea 6.40 /ea 586
DAMPFLT32 Pure Wool Sound Absorbent Felt (500*1370*13)mm 1 11.24 /ea 10.67 /ea 977
 

* Pure Wool, sound absorbent felt. 48oz / sq yd. Thickness 16mm.

Order Code Description: Pure Herdwick Wool Felt. Pack Size Price 1+ Price 6+ Pk Wt gms
DAMPFLT5 Pure Wool Sound Absorbent Felt (300*685*16)mm 1 3.69 /ea 3.51 /ea ***
DAMPFLT51 Pure Wool Sound Absorbent Felt (300*1370*16)mm 1 7.38 /ea 7.01 /ea ***
DAMPFLT52 Pure Wool Sound Absorbent Felt (500*1370*16)mm 1 12.30 /ea 11.69 /ea ***
 
Felt Strips / Coins
(5) Felt Damping Coins & Strip.

*  Mechanical Damping Felt.

    A heavyweight hard cotton / wool felt available in felt strips of (30 * 150 * 10)mm and which may be cut to size or shape. Also available as felt coins 25mm diameter by 7.5mm thick. The material is used to dampen unwanted mechanical vibration. Ideal for speaker stand platforms or beneath equipment. Non adhesive backed.

* Hard Felt Strips & Coins. Sold in packs of 4 strips, 8 coins..

Order Code Description: Hard Felt strips & coins. Pack Size Price 1+ Price 6+ Pk Wt gms
SP09 Hard Felt Strip (30 * 150 * 10)mm 4 3.35 /4 3.18 /4 68
SP10 Hard Felt Coins (25 Diam * 7.5)mm 8 3.35 /8 3.18 /8 11
 
Bitumastic Damping Sheet
(6) Bitumastic Damping Sheet

*  Bitumastic Damping.

    A heavy grade self adhesive backed Bitumastic damping material used for sound deadening. Now available in 3 weight options. Sheets / pads of (600, 300, 150)gms per sheet, The cut sheets are all  (200 by 300)mm and are used for suppressing resonant panels. The adhesive provides good material coupling to wood panels. For extra security it is recommended the sheets are tacked / nailed into place as this will prevent creep or failure / detachment in hot weather. See our ARTICLE about Using Bitumastic Damping.

* Heavy, Self adhesive, 100% Bitumastic, Damping Sheet.

Order Code Description: Bitumastic Sheet. Pack Size Price 1+ Price 6+ Pk Wt gms
DAMPSHT1 Bitumastic Sheet (200*300*5)mm 1 3.36 /ea 3.19 /ea 620 /ea
DAMPSHT2 Bitumastic Sheet (200*300*2.5)mm 1 2.24 /ea 2.13 /ea 319 /ea
DAMPSHT3 Bitumastic Sheet (200*300*1.5)mm 1 1.76 /ea 1.68 /ea 160 /ea
 

*  Bitumastic, alternative sizes.

    Larger sizes are for customer collection 'ONLY', available in the following sizes. For best results this material should be transported and stored flat.

* Bitumastic Sheet. Larger Sizes, Customer Collect Only.

Order Code Description: Bitumastic Sheet. Pack Size Price 1+ Price 6+ Pk Wt gms
DAMPSHT11 Bitumastic Damping Sheet (300*1000*5)mm 1 16.80 /ea **** 3100 /ea
DAMPSHT12 Bitumastic Damping Sheet (600*1000*5)mm 1 31.97 /ea **** 6200 /ea
 

*  Bitumastic samples.

    For Postal Samples of Bitumastic Damping Sheet (DAMPSHT1), (DAMPSHT2) or DAMPSHT3 please enclose four (4) First Class Stamps in an envelope along with your name and UK address. Sample size (100 * 50)mm.


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All Prices include UK VAT @ 20%.   See buy it for further information.