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Thread: Ideal parameters for midbass drivers? Qts, Fs, etc

  1. #21
    Founding Member earthtodan's Avatar
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    Where do you model things like cone material, breakup modes, the presence of a phase plug, etc?

    This is getting a little over my head and beyond my current means, so I'm going to order a pair of Usher 8945Ps and see how they sound.

  2. #22
    Senior Member cvjoint's Avatar
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    You can see breakup in the FR a lot of the times in third party FR tests. Metal cones in particular as they are fairly smooth with the exception of one or two well defined breakup peaks. To some extent if the manufacturer does not even provide you with an FR that is indicative of the product performance (or lack off). Most serious manuf. provide one. The Ushers are very well documented. I think Mark K. has lots of distortion testing on them.

    Ahh here it is, my memory served me well:
    http://www.audioheuristics.org/measu...ew_7_tests.htm

    The speaker is a partial copy of the Scan from what I understand.
    Last edited by cvjoint; 04-03-2011 at 04:37 AM.

  3. #23
    Founding Member earthtodan's Avatar
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    Quote Originally Posted by cvjoint View Post

    Ahh here it is, my memory served me well:
    I never get the title right on any of these pages...
    Thanks! I don't know how to translate these plots to a sonic signature but the Usher looks like it tested very nicely against the rest.

  4. #24
    Tester Extraordinaire ErinH's Avatar
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    Quote Originally Posted by cvjoint View Post
    I do have to agree with you that there isn't nearly enough 3rd party testing on drivers, but there is enough to give you a few options. Some sites, such as Zaphs posts only positive reviews, if it's not tested odds are...
    That's exactly what I'm trying to do here:
    http://www.mobilesoundscience.com/f1...9/index15.html

    Your ears: The best tools you have... and they're free, too!

  5. #25
    Tester Extraordinaire ErinH's Avatar
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    Quote Originally Posted by earthtodan View Post
    Thanks! I don't know how to translate these plots to a sonic signature but the Usher looks like it tested very nicely against the rest.
    Don't worry, no one else seems to have a source that does either. Although there is a lot of conjecture as to various orders of distortion and the effect on performance.
    Your ears: The best tools you have... and they're free, too!

  6. #26
    Founding Member earthtodan's Avatar
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    Well, my midbass choice is now set in... plastic.



    If I'm lucky, they'll work great. If you guys are lucky, I'll end up doing comparisons.

    Either way, these are cut for the largest diameter 7" woofer I've found, so anything else will be an easy drop-in.
    Last edited by earthtodan; 04-03-2011 at 01:04 PM.

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