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Bearing found inside subwoofer! Does it go to it?

Discussion in 'Power Electronics' started by Lezlie, Apr 19, 2020.

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  1. Lezlie


    Apr 19, 2020
    Hi. I have a HK395(S) 3 peice speaker system and I had lent it to a friend. He brought it back to me the other day, but failed to mention the strange rattling sound of an object moving around within the main sub! It sounded similar to a marble possibly. (He has little kids so I thought maybe they put something in it through the hole)
    So I opened up the back and found a freestanding, small bearing within. Its about the size of a quarter and about 2-3cm thick. (Pic will follow). My question is, does it go to the speaker and fell off/out of something or was it placed in there with little fingers?? I've looked through the whole inside of the sub box but cant find a placement location for it. Thanks!! (Sorry, apparently I cannot upload a pic of this piece I found. I may be able to after I post this??)
  2. Harald Kapp

    Harald Kapp Moderator Moderator

    Nov 17, 2011
    Simply paste the image into the edit window. A file size less than 100 kB is usually good, I do not know the upper limit to file size.
  3. Bluejets


    Oct 5, 2014
    Maybe it makes the sur-:):)round sound work better.
  4. Martaine2005


    May 12, 2015
    I think the first question is :
    Does the speaker box have a hole/grill or port that would allow an item of this size to enter it?.
    And secondly, is it a ball bearing or a sealed bearing race?.

    If this unit is purely a sub box, I doubt it has any reason to be inside other than curious little fingers.

    Ask your friend if they are missing a ball from a game like ‘Crossfire’.

  5. 73's de Edd

    73's de Edd

    Aug 21, 2015
    And if the enclosure is ported . . . .that is one possible, easy entry point.. . . . . . . . .damn rugrats!
    ( BTW . . . .Crossfire balls are MUCH -MUCH-MUCH smaller than an AMERIKANSKI quarter. )
    Last edited: Apr 19, 2020
  6. Martaine2005


    May 12, 2015
    Lol. They sure seemed big when I had mine at 8 yrs old.
    Then again, so did petite pois.. :)


    May 20, 2017
    Have built quite a few ported speakers. Never found any need for a small bearing. I think as others have intimated, little people have wondered what might happen if I just put this little thing through this hole?????
    Martaine2005 likes this.
  8. hevans1944

    hevans1944 Hop - AC8NS

    Jun 21, 2012
    Sounds like a complete ball-bearing (outer race, inner ball carrier with balls, inner race) from your description of size (about that of a quarter) plus thickness. Might have come from a disassembled toy, however unlikely that might be. How old are the "little kids" and how handy are they with tools? This "mystery object" does not belong in your sub-woofer unless... more on this after much further research.
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