Fiberglass?

BAF wadding (polyester fibre) is also self supporting when rolled up.
 

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There are different densities of fibreglass and probably different densities of polyester fibre, so it is not possible to make a direct comparison as to effectiveness.

Polyester fibre is the modern absorbent of choice. It should be rolled up loosely and the amount adjusted until the bass response sounds best by ear.
 
There are different densities of fibreglass and probably different densities of polyester fibre, so it is not possible to make a direct comparison as to effectiveness.

Polyester fibre is the modern absorbent of choice. It should be rolled up loosely and the amount adjusted until the bass response sounds best by ear.

Oh! alright then. Polyester fiber roll & polyfill (pillow stuff) is same thing but in different form isn't it?
 
Fiberglass is not the end all. It has some good qualities it's true but there are better items/combos to use. It's popular because it's readily available and inexpensive in many places people make speakers.

I noticed you have changed to Kolkata. I was hoping you were, for access to materials.

Actually i live in a small town, kolkata city is 100km away from here, West bengal is our state among 29 other states of india. Fiberglass is available in kolkata. It's a famous city of india. Sorry for my horrible English..
 
West bengal is our state among 29 other states of india. Fiberglass is available in kolkata. It's a famous city of india. Sorry for my horrible English..
Yes, info is readily available even if one has not visited, as I hope to one day.
The state of West Bengal, home of Kolkata, once known as Calcutta to westerners, is about 10 million people and is well known to the world. Park Street, the street food and the Knight Riders come to mind. Not to mention your architecture and other cultural items. 🙂

But I digress.

Your horrible English is as good as many native speakers.
 
Yes, info is readily available even if one has not visited, as I hope to one day.
The state of West Bengal, home of Kolkata, once known as Calcutta to westerners, is about 10 million people and is well known to the world. Park Street, the street food and the Knight Riders come to mind. Not to mention your architecture and other cultural items. 🙂

But I digress.

Your horrible English is as good as many native speakers.

wow! 😱
you are very much welcome!