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Question about crossovers

Discussion in 'Home Cinema Speakers' started by Colin Parker, May 8, 2005.

  1. Colin Parker

    Colin Parker
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    I played a 20 hz tone through my B&W 704's and the mid range cones moved just as much as the woofers. SHould this happen? I thought that was what a crossover was for?

    Thanks
     
  2. eviljohn2

    eviljohn2
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    The 704's are a 2.5 way design. This means that the tweeter gets the high frequencies (the first "way"). The next driver gets the remainder of the signal incorporating the midrange and the low frequencies (the second "way"). The additional driver is the "0.5 way" and assists with only the low frequencies.

    A 3 way crossover design would indeed seperate the frequency ranges as you describe. :)
     
  3. eviljohn2

    eviljohn2
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    Actually B&W describe it even better on their website:
     
  4. Colin Parker

    Colin Parker
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    Gotcha. Thanks.
     
  5. Colin Parker

    Colin Parker
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    Actually, I just realised my fronts are set to small, with the 3805's xover at 100 hz. The signal shouldn't even get as far as the speakers should it?
     
  6. eviljohn2

    eviljohn2
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    Crossovers such as that are not "brick wall" filters as such but just gently filter down through the frequencies so it's quite plausible for the speakers to be receiving the tail end of such a signal. You also don't mention whether you have a sub or not but assuming you do you will have found that most of the energy will have been produced from that than your speakers. :)
     
  7. Colin Parker

    Colin Parker
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    My sub is a Rel 200.

    I was under the impression xovers were 'brick walls'. Every day's a school day!

    Thanks for your help John.
     
  8. alexs2

    alexs2
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    As eviljohn says,crossover filters are not designed as brickwall filters,and for very good and very audible reasons,as the effects of a very high order filter can often be very detrimental to the sound quality,and may well add to the reactivity of the speaker overall,thus affecting the amp's abilities as well.
     

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