Replacing sound proofing in cabniets


I have an old set of speakers I am bring back to life. I have replaced many of the drivers. My next step is replacing the thick cloth material inside the cabinets. Must be used for sound proffing, keeping the sound from bouncing about.
Just curious what people use for this. Carpet pad? Any suggestions sure be appreciated!

Thank you.
johnymac
As the above poster stated, home insulation fiberglass works very well. I've seen many charts from tests of various speaker stuffing materials and good ole fiberglass holds it's own quite well.
Are these speakers vented or sealed? At what frequency does the woofer cross over to the mid? Sean
>
These speakers are vented. Someone suggested home carpet felt pad. As far as what frequency, I have no idea??
After doing some research, I see there is acoustic foam. I also see some sort of egg carton liner.
Has anyone used these?
I was told that some felt carpet pad would do the trick.
I like the insulation idea, but would thing that the fibers might eventually come out the vent holes.

Thanks!!