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Old 29th December 2002, 10:51 PM   #1
diyAudio Member
Join Date: Dec 2002
Location: Columbus, Ohio
Question Proac 2.5 Damping materials ?


I am planning to build a set of Proac 2.5's as my first DIY project and
have some questions about the damping materials :

1. Is the Bituminous felt necessary to add for damping if the
18mm and 25mm MDF are used as prescibed?
( do you have experience building without?)

2. What is this material called in the US and where can it be purchased?

3. Is the Polystuff material availalble at Partsexpress equivelent to
dacron 200g/m2 ?
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Old 29th December 2002, 11:10 PM   #2
diyAudio Member
Join Date: Jan 2002
Location: Bucks County, Pa
Look for 30 lb roof felt (paper) at Home Depot. Polyfill can be had at WalMart or craft stores. It's ~$2 for a 20 oz bag.

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Old 30th December 2002, 12:21 AM   #3
tiroth is offline tiroth  United States
diyAudio Member
Join Date: Dec 2001
Location: Pittsburgh, PA, USA
The 30lb felt is far too light. 90lb weight is something like 2.2mm, and I believe 5mm thickness is specified.

You should not skip the bitumen. I am experimenting with something called selvage, which has a rocky side that I coated with a thick layer of rubberized auto undercoat. Initial tests are promising.
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