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Thread: Credence Clearence BN10-8 Subwoofers

  1. #1
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    Credence Clearence BN10-8 Subwoofers

    I picked up a pair of **these** because I couldn't pass up the price of $104 shipped for the pair.

    They look exactly as described:




    and measure real close to the published specs (bottom of page)
    Clearance Corner

    with my Woofer Tester 3:




    Unfortunately, I screwed up the pre break-in measurement on the first woofer, but I managed to get a good one on the second sub. After 6 hours at 25 Hz, I'll let the sub rest for an hour and take post break-in measurements to see what, if anything, has changed.

  2. #2
    Devil's Advocate Adam_MSS's Avatar
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    That looks like a hell of a deal. How are you planning to use them?
    You don't use science to show that you're right, you use science to become right. - R.Munroe

    The important thing in science is not so much to obtain new facts as to discover new ways of thinking about them. - W.L.Bragg



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    I'm hoping I can run them to 150 Hz and either mate them with the Fountek FR88EX full range drivers that I have on hand or a midrange and tweeter if the full range thing doesn't work out. I'm planning on building a modular, stackable enclosure similar to the old Technics SB-6000 as a modern rendition on a set of speakers that I used to own. Only difference, I'm all about experimenting now!
    Last edited by ChrisB; 10-28-2011 at 11:13 AM. Reason: My bad, it was the 3 ways that I had in the past

  4. #4
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    And here is the second driver after breaking it in with a 25 Hz test tone for 8 hours at 10 volts of output to get that cone moving.


  5. #5
    Devil's Advocate Adam_MSS's Avatar
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    Looks like the suspension softened just a bit during the break-in. Data lines up with theory. That's always a good thing.
    You don't use science to show that you're right, you use science to become right. - R.Munroe

    The important thing in science is not so much to obtain new facts as to discover new ways of thinking about them. - W.L.Bragg



  6. #6
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    I like being able to experiment and learn the science behind the sound! Man, have I ever come a long way.

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    Hi Chris, a little OT but do you use the added mass method? How relieable do you find it? I use it too and seems a little hit/miss, have been told the known box volume method works better-have you tried that?

  8. #8
    Big Daddy Chad's Avatar
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    I use added mass and find it predictable.... BUT I have found ALL the tests need to be done, especially with the newer software and larger woofers, with NO air movement. Shut the ceiling fan off!

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    Following Chad's advice, I wait until my AC isn't running, and turn the ceiling fan off.

    I have yet to try the known box volume method, but the added mass seems to be consistent thus far. Ironically, I found that quality woofers from major manufacturers tend to measure very close to the manufacturer's published specs. As for not so major manufacturers, results may vary GREATLY.

  10. #10
    Big Daddy Chad's Avatar
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    For mass I use sitty putty stuck on a flat chunk of polished rock, LONG STORY, It's thin, smooth and flat... Then I add larger nuts to it to gain the weight I need.

    One weight does not fit all.

    Hell, on a JBL I used the bolt off my Mosin Nagant!

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