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Damaged UM18?

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  • Damaged UM18?

    I am trying to determine if I have a damaged UM18. I have it in a 4cu sealed enclosure I put together. I've had it almost a year. The other day I decided to play "Bass I love you", because I've seen it many times in videos but never heard it on my own system. That may have been a poor decision. About halfway through the song I heard what I thought may have been some mechanical noise from the driver, so I shut everything off. I then turned everything back on, backed the volume down and ran a frequency sweep in REW. There was some major noise around 25-30hz tone. I took the woofer out of the box to make sure nothing came loose inside. I couldn't find anything amiss so put the driver back in the box. Then everything seemed fine, no noise. Then I realized there was some network equipment stacked on each other in the corner. It's possible the sound was that stuff rattling, but I was pretty sure the noise came from the driver. Now I'm not sure. Today I decided to push the cone in and test for voice coil rub. I noticed that if I push on the right side or the top, the VC will rub. However if I push on the bottom or the left side, there is no rub. Also no rub if I push on the center. So it seems the VC is tweaked to the left/bottom? Is this for sure a sign of damage? It is coming up on one year since I purchased it, so possibly still can get a warranty from PE. Tomorrow I had planned on a movie night with my little bro and we were both gonna see Dunkirk for the first time! I planned on really putting the sub through some work for that, but now I'm thinking if I make the sub worse I may not be able to get warranty coverage, if it is damaged. Thoughts? Sent from my Pixel 3a XL using Tapatalk

  • #2
    If it rubs when you push on one side that's OK, because the cone doesn't do that in use.
    www.billfitzmaurice.com
    www.billfitzmaurice.info/forum

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    • #3
      I'd remove the driver and drive it with enough of a very low frequency signal to move the cone substantially, and listen for problems.
      Francis

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      • #4
        Originally posted by billfitzmaurice View Post
        If it rubs when you push on one side that's OK, because the cone doesn't do that in use.
        Ok yeah that makes sense. I went and tried this on my JL W3 and it rubs if pushed on anywhere but center. Sent from my Pixel 3a XL using Tapatalk

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        • #5
          Originally posted by fpitas View Post
          I'd remove the driver and drive it with enough of a very low frequency signal to move the cone substantially, and listen for problems.
          Ok thanks, I will do this. I actually just realised what the rattling might have been. I recently finished building 2 Elusive 1099 speakers, and one is on the sub box. I thought there was no way 100+ lbs speakers would rattle on top of the box, but they were. I tested again and that one was making quite the racket. I added some foam underneath that one and that seems to be solved. Which spawned a flurry of sound deading, the coffee table, tv screen, picture hanging lol. Sent from my Pixel 3a XL using Tapatalk

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          • #6
            ALL "Dayton" drivers come with a 5 year warranty. Lucky you.

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            • #7
              Originally posted by Chris Roemer View Post
              ALL "Dayton" drivers come with a 5 year warranty. Lucky you.
              The cost to send it back though....OUCH.

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