Sony Sub WM-40 Polyfill Question

Discussion in 'Archived Threads 2001-2004' started by Dave Goff, Jan 15, 2003.

  1. Dave Goff

    Dave Goff Agent

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    I have my system pretty much set up and it works fine. I have read about stuffing the Sony subs with polyfill, using about one half to three quarters of a pound of the stuff and lining the inside so it does not touch the speaker or blocks the port.

    It appears I need to unscrew the speaker to get inside. Is this how others have done it or is there another / better way?

    Thanks
     
  2. Jeff-Watson

    Jeff-Watson Stunt Coordinator

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    You are correct. Carefully remove the screws from the speaker. You may have to help the speaker a little when removing it as it has a good seal but it will come out fairly easy. Add the Polyfill around the inside walls and reinstall the speaker. It makes a definite improvement in the sound. Not so boomy after the mod.
     
  3. Neil Joseph

    Neil Joseph Lead Actor

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    Be careful not to overstuff and/or cover the internal amp in such a way as to affect it's cooling. You could blow a transistor like I did in my PSB Sub6. Lucky for me I was able to fix it.
     
  4. EricM

    EricM Auditioning

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    Are there any websites that show internal pics of a polyfilled sub?
     
  5. Dave Goff

    Dave Goff Agent

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    Yes it would be great to see a picture of a lined sub enclosure. Also I assume you need to staple the stuff to the sides so it does not shift to unwanted locations.
     
  6. Todd_Glassman

    Todd_Glassman Auditioning

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    I thought I would have to staple the polyfill to keep it in place, but you will find as I did that the stuff really holds its place by itself.
     
  7. Jeff-Watson

    Jeff-Watson Stunt Coordinator

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    No stapling necessary in my case. It holds its form rather well. I opened mine up to check that very thing about two weeks ago and no problems at all.
     
  8. Paul_Fisher

    Paul_Fisher Screenwriter

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    In what section of Wal-Mart can you find this stuff?
     
  9. Dave Goff

    Dave Goff Agent

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    I found it at Michael's, a craft supply store. Ask the person at the counter. 20 oz was $2.99 they had smaller bags for $2.00
     
  10. Brian_Tho

    Brian_Tho Stunt Coordinator

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    Theres not an internal amp in the sony. The amp is external. just a big hollow box begging for polyfill. The members of this forum are correct, I did this mod it not only sounded better with music, but tightened up the bass on movies.
     
  11. Dave Goff

    Dave Goff Agent

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    Thanks to all the replies. The wife keeps asking me what I am going to do with the bag of white fuzz. I told her not to toss it or put it away. Tonight the polyfill goes in, and I will play a few tracks off Pearl Harbor. I will let you folks know how it goes.[​IMG] [​IMG]
     
  12. Dave Goff

    Dave Goff Agent

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    I did fill the sub up with polyfill. I weighed the bag prior to adding and after. I used 9 ounces of poly. Tried to pull it apart fairly evenly, about 2 to 2.5" thick, trimmed it with scissors fairly square. I did use a heavy duty stapler to hold it back up front so no contact with the speaker.

    Instead of Pearl Harbor tested with Star Wars episode II, I recommend that you find a track you know well, and listen to it just before the poly addition and immediately after. It is better, haven't listened to it modified with music sources yet.
     

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