Replacing sound proofing in cabniets

For a vented system you should only have material lining the cabinet walls. In a sealed system you would have the filler material filling the entire cabinet interior (the amount of stuffing will depend on a number of design goals). Placing any type of material in the vent tube or vent hole will change the "Q" of the speaker system alignment. If we assume that the speaker's designer knew what he/she was doing, changing the alignment will probably not improve things.

Barry Kohan

I like the idea of adding Acoustic foam/low density foam.
Can anyone tell me the best place to buy this? My replacement drivers should be on their way soon and am hoping to replace the old material ASAP.

Thanks!!

Agree with above posts, but will add a couple of other suggestions...

You can try to completely stuff the box with foam - the type Sean recommended exactly. While it goes against the conventional wisdom to stuff a ported box, this is what the Fried Line Tunnel or the Von Schweikert Transmission Line(I disagree that it is a TL) do.

Or, you can use polyester batting, loosely filling up the box.

Both of these things can relieve a speaker of its boxiness in many, many instances, turning wheezing bass into more natural sound. As in all cases, experimentation is needed to see if it works for you and/or your speakers.

www.partsexpress.com

I bought some acoustic fill from them. They have a few selections including eggcrate foam, stuffing, and dampening sheets.

As Barry aka "Bright Star Audio" mentioned, i typically do not advocate stuffing the port in any way, shape or form. That is, unless one is "experimenting" and does so in a fashion that is easily reversed.

Having said that, most mass produced and even many "audiophle approved" and "hand built" vented designs will benefit from what i've mentioned. As mentioned in another thread, i just got done doing this to a pair of speakers that currently retail for over $3K. The results were quite obvious and highly beneficial. For the record, these speakers were HIGHLY under-designed to begin with in almost every aspect. Even though they were poorly designed, lacked proper implimentation of the design, which resulted in them sounding like crap, they get rave reviews all the time. Sean
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