EBP...

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  • Jack Gilvey
    Senior Member
    • Aug 2001
    • 510

    EBP...

    It's my understanding that a subwoofer with a low Efficiency Bandwidth Product should not be used in a vented cabinet. For example,I understood this to be the reason that the NHT 1259 is specifically not recommended for such an application. What I've never seen is a clear description of what would result from such a loading, except that it would sound terrible, with very bad transient response (although the fr LOOKS amazing in such a box). Is this the case?

    Anyone care to clarify exactly what is going on here, and how the various parameters that make up the EBP conspire against or for a type of loading?

    Also, I assume (yikes) that a driver unfit for reflex loading would be similarly unsuitable for use with a passive radiator. Is this the case?

    Just something I've been wondering about, trying to grasp what that number actually means. Thanks.
  • JonMarsh
    Mad Max Moderator
    • Aug 2000
    • 15271

    #2
    It's something of an oversimplification, but it comes dow to the Qts of the driver- ported systems work best with drivers in the range of 0.25 to 0.4; higher Qts, and as you say, the transient response suffers for a ported sytem. You're best off with a sealed system. This is neglecting discussing Qms, Vas, and Fs, but those more affect what frequency range the driver will work well at, and how large a box. Personally, even for sealed systems I don't like to see over 0.4, and for reflex systems I prefer 0.3 as the sweet spot. YMMV.

    Regards,

    Jon




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    • Jack Gilvey
      Senior Member
      • Aug 2001
      • 510

      #3
      Thanks, Jon.

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