Fearful 15/6 Celestion BN15-400S

Discussion in 'Amps [BG]' started by cwz, Dec 29, 2013.


  1. cwz

    cwz

    Joined:
    Apr 16, 2013
    I'm just starting a Fearful 15/6 build and came across a deal on Celestion BN15-400S speakers. Would this be a good substitute for the Eminence 3015LF? The TS parameters look close in some respects but not in others. I'm don't have enough experience to know if the differences will be a problem. Anyone care to venture a guess?

    Celestion BN15-400S
    [​IMG]
    photo hosting

    Eminence 3015LF
    [​IMG]
    screen capture
  2. Bass_Pounder

    Bass_Pounder

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    An X-Max of 2.5mm compared to the 3015's 9.6mm makes it not even close at all.

    Laughable actually.
  3. CL400Peavey

    CL400Peavey Supporting Member

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    +1000000
  4. cwz

    cwz

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    Does the Xmax roughly translate to SPL?
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  6. Cirk

    Cirk

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    Xmax is the distance the cone will travel. This is directly proportional to the volume of air moved. It is relevant to note that the Eminence driver has an efficiency rating 4db higher than the Celestion, which means it's better than twice as loud.
  7. B-string

    B-string Supporting Member

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    Xmax is the distance the cone can travel in one direction and remain "undistorted" or linear. When you multiply the actual cone area by that travel distance you get "how much air" the speaker can displace to "make" sound. Barefaced does a good job of explaining most things and dispelling myths in their tech section: http://barefacedbass.com/technical-information/Volume-displacement.htm lots of good reading there!
    There is also Xlim which is the maximum the cone can travel before mechanical damage happens.
  8. Bass_Pounder

    Bass_Pounder

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    Quick correction.........

    Twice as loud is +10db

    I think you meant to say that it would take twice the power to make the Celestion as loud as the 3015lf
  9. tom-g

    tom-g

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    Short answer: yes
  10. cwz

    cwz

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    Apr 16, 2013
    Thanks for the responses.

    So if loud is what I want, and that's what I want, the Celestion BN15-400s will not cut it.
  11. B-string

    B-string Supporting Member

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    Correct and the cab design was not made around that speaker's requirements so strike three it's out. ;)
  12. Bass_Pounder

    Bass_Pounder

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    Any speaker other then what the cab was designed for will not cut it.
  13. tom-g

    tom-g

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    Oct 2, 2007
    If you want a Fearful, you need to build to spec. The complete package is designed with only the specified components. There are no options for the 15/6. There is a price to pay for a high end design like a Fearful.
  14. mapleglo

    mapleglo Gold Supporting Member

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    The resonant frequency (fs) specs are pretty close, but the Q and Vas parameters are off quite a bit. That would directly effect the size of both the enclosure and port. You'll need a good enclosure design program (or lots of manual calculations) to determine how the other driver will perform in the existing design. Chances are, it won't work well. And that's in addition to the perviously mentioned Xmax spec.
  15. cwz

    cwz

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    OK, I'll stop trying to pinch pennies and build it to spec.
  16. BassmanPaul

    BassmanPaul Gold Supporting Member

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    Atta boy!!!!! :D
  17. B-string

    B-string Supporting Member

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    That is the only sensible plan of action, otherwise you might as well buy a standard production cab and get better performance. What you were wanting to do is like putting a Honda 4 cylinder engine in a high end sports car. It might still look like a Ferrari, but it won't perform like one.
  18. lowsmatter

    lowsmatter

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    Dec 8, 2013
    What BassmanPaul & tom-g said.... you'll be glad you followed the fEARful spec.
  19. Jeff Scott

    Jeff Scott Don't just TalkBass - PlayBass! Supporting Member

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    So, the corollary is that I can drop this in my Honda and get......... :bassist:

    Attached Files:

  20. B-string

    B-string Supporting Member

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    A twisted frame undriveable Honda :D

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