Closed Thread
Results 1 to 7 of 7

Reload Thread: Polyfill and sub enclosure questions

  1. #1
    DDFrontier's Avatar
    DDFrontier is offline Member



    Join Date
    Feb 2007
    Location
    Louisiana
    Posts
    116
    Post Thanks / Like
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quoted
    5 Post(s)

    Polyfill and sub enclosure questions

    I have two Pioneer 8" subwoofers (model TS-W203C 4 ohm) in a sealed enclosure. Pioneer recommends 0.5 cubic feet of airspace per subwoofer. I have them in a small sealed box with 0.9 cubic feet of shared airspace (no divider). The subs sound fine at most frequencies, but struggle when going down low and sometimes sound 'boomy'. I know this is a characteristic of such a small subwoofer, but does the box being too small contribute to this? Can I add some polyfill to the box to 'trick' the subs into performing like the box was built to specs? If so, how much do I add?

    They are powered by a Total Mobile Audio T500.1 amp running at 500W x 1 into 2 ohms. (the subwoofers are wired in parallel)

    I e-mailed Pioneer technical support and this is the seemingly uneducated response:

    "I have two TS-W203C 8" subwoofers in a sealed enclosure sharing a common
    internal volume of 0.9 cubic feet. The subs are 4 ohm wired in parallel to an amp
    delivering 500W x 1 into 2 ohm (250W RMS
    per sub). This particular subwoofer requires 0.5 cubic feet of volume each. That's
    a total volume requirement of 1.0 cubic feet. So, my enclosure is 0.1 cubic feet
    too small. Should I add
    polyfill to the enclosure to 'trick' the subs into thinking the enclosure is
    bigger? If so, how much do I add?"

    Pioneer's response - "Thank you for contacting Pioneer Electronics, Inc.

    No, that is a wrong idea about adding a insolation. It make the box volume smaller.
    You may want to have a box with two chambers. The subwoofer work well in it.


    Thank You,

    Khammy
    Customer Service Representative



    Thanks for your help.
    Last edited by DDFrontier; 02-15-2007 at 04:00 PM.







  2. #2
    Darth Audio's Avatar
    Darth Audio is offline Old School Veteran



    Join Date
    Oct 2005
    Location
    Dark Side
    Age
    41
    Posts
    326
    Post Thanks / Like
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quoted
    0 Post(s)

    Re: Polyfill and sub enclosure questions

    Usually you use 1lb per cu. ft. of polyfill. So with your volume minus woofer displacement I'd suggest about 1/2-3/4 lb. When using polyfill or similar materials to stuff your enclosure you can make it 25% smaller. So your just about where you need to be.



    99 Mitsubishi Galant

    CDT Audio CL 62's
    CDT Audio UP219's
    CDT Audio CL1215
    3 MTX Thunder 2160's
    Alpine 9835
    GO IRISH!

  3. #3
    DDFrontier's Avatar
    DDFrontier is offline Member

    Threadstarter


    Join Date
    Feb 2007
    Location
    Louisiana
    Posts
    116
    Post Thanks / Like
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quoted
    5 Post(s)

    Re: Polyfill and sub enclosure questions

    Thanks! That was my thought as well, but I was just looking for confirmation. 1/2 - 3/4 lb of polyfill is not going to pack this box. So, is it o.k. for it to just free float around in there? Also, the woofers fire down. Will the polyfill hurt them if it comes to rest on top of them?

    Also, doesn't the manufacturer take into account woofer displacement when they state the recommended enclosure volume?




  4. #4
    Darth Audio's Avatar
    Darth Audio is offline Old School Veteran



    Join Date
    Oct 2005
    Location
    Dark Side
    Age
    41
    Posts
    326
    Post Thanks / Like
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quoted
    0 Post(s)

    Re: Polyfill and sub enclosure questions

    I think your going to be surprised how much you stuff into that box if you use the whole 3/4 lb. I doubt it will be floating around. Try not to stuff right behind the woofers, but a little behind there will not hurt.



    99 Mitsubishi Galant

    CDT Audio CL 62's
    CDT Audio UP219's
    CDT Audio CL1215
    3 MTX Thunder 2160's
    Alpine 9835
    GO IRISH!

  5. #5
    briman1001's Avatar
    briman1001 is offline Member



    Join Date
    Jan 2007
    Location
    Sarasota, FL
    Posts
    126
    Post Thanks / Like
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quoted
    0 Post(s)

    Re: Polyfill and sub enclosure questions

    So it is ok to just stuff the hell out of the box with the polyfill. I did not put that much in mine I guess. I will stuff more in there. Just stuff as much will fit is that the deal?




  6. #6
    DDFrontier's Avatar
    DDFrontier is offline Member

    Threadstarter


    Join Date
    Feb 2007
    Location
    Louisiana
    Posts
    116
    Post Thanks / Like
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quoted
    5 Post(s)

    Re: Polyfill and sub enclosure questions

    No, he said add 1 lb. per cubic foot of volume.




  7. #7
    newusername's Avatar
    newusername is offline CarAudio.com Veteran



    Join Date
    Jul 2005
    Location
    dg
    Posts
    3,725
    Post Thanks / Like
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quoted
    0 Post(s)

    Re: Polyfill and sub enclosure questions

    This should answer your question pretty aptly:

    http://www.soundsolutionsaudio.com/f...showtopic=7168




Closed Thread

User Tag List

Posting Permissions

  • You may not post new threads
  • You may post replies
  • You may post attachments
  • You may edit your posts
1e2 Forum