damping material

[Professor smith]

is polyester adequate to stop standing waves and the boxy coloration? what frequencies is it effective?

What other materials than fibreglass can be used?

and what does boxy coloration sound like? what frequencies does it affect?

[Speak]

Originally Posted by Professor smith

is polyester adequate to stop standing waves and the boxy coloration? what frequencies is it effective?

What other materials than fibreglass can be used?

and what does boxy coloration sound like? what frequencies does it affect?

Polyester wool work but sheep wool is best. Black for darker sound

Talk into a empty box and you will hear.

Frequency with wave length smaller than half of inner size dimensions. Wave length=f/c. c=343 [m/s], f=frequency

[planet10]

Originally Posted by Speak

Polyester wool work but sheep wool is best. Black for darker sound

I find UltraTouch (recycled cotton) even better.

dave

[Professor smith]

Originally Posted by planet10

I find UltraTouch (recycled cotton) even better.

dave

it says its 80% recycled denim. whats the 20%?

and where can this be bought? preferably in UK.

thanks

[Inductor]

Originally Posted by Professor smith

it says its 80% recycled denim. whats the 20%?

and where can this be bought? preferably in UK.

thanks

In this case 80% denim+20% others (supposing it's cotton).
The industry is selling for many uses, like for garages (to clean the oil).
The properties are some what different between wool, cotton and rockwool (use this instead of glasswool).
Here pics of recycled cotton.

[Monteverdi]

I agree with ultratouch. It has a significant higher absorption in 100 to 250Hz range than Dracon, Accustuff,wool etc. I used it for sound absorption in my room quite effectively. May be not the best choice for vented or TL as it will absorb to much of the low frequencies. Another new material is Angelhair (not from the haven but twaron) expensive but not much is required. I tried 8g/l in a closed box for mids and up.

[simon dart]

I've had a lot of success with this recently:

www.diy.com.ECO-Sheeps-wool-Insulation

I've always had mixed results with polyester based stuff. This seems to work better at those troublesome lower mid frequencies for me.

Pure sheep's wool is a lot of work to get to the right density, it tends to clump. This stuff teases out pretty well as it has polyester too. Haven't tried the recycled denim though.

[Professor smith]

Originally Posted by Monteverdi

I agree with ultratouch. It has a significant higher absorption in 100 to 250Hz range than Dracon, Accustuff,wool etc. I used it for sound absorption in my room quite effectively. May be not the best choice for vented or TL as it will absorb to much of the low frequencies. Another new material is Angelhair (not from the haven but twaron) expensive but not much is required. I tried 8g/l in a closed box for mids and up.

why dont they state what material angel hair is? I would not use something I dont know anything about. Can ultratouch be used for a bass trap in the room too?

[planet10]

Originally Posted by Monteverdi

Another new material is Angelhair (not from the haven but twaron) expensive but not much is required.

I have a sample of this, came highly recommended, haven't done anything with it yet. Only available in Europe AFAIK.

dave

[Professor smith]

what happens if I fill the entire speaker enclosure with that cotton damping? will this maximise the damping at the lowest frequencies? The trouble is, it seems that at <100hz many materials do not absorb much. And its a ported cabinet by the way.