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sub crossover

Discussion in 'Subwoofers' started by steve0, May 3, 2005.

  1. steve0

    steve0
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    Here are the speks for my speakers
    Drive Units Reflex ported 100 mm (4in.) UNI-Q® array with 19 mm (3/4 in.) tweeter
    Frequency range 80 Hz - 27 kHz
    Power Handling 100 W
    Amplifier N/A
    Sensitivity (2.83V/1m) 88dB
    Maximum output (SPL) 104 dB
    Impedance 8 ohms
    What should i set crossover on my sub too, I have a BK xls200
     
  2. eviljohn2

    eviljohn2
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    Although you've supplied plenty of information, you omit the model numbers of your speakers and amplifier. I'm guessing that you're using Kef speakers but have no idea what amplifier you're using for these.

    If you're using an AV receiver then the best starting point is to click the sub's crossover dial into the "bypass" position. This question gets asked quite a lot in various different ways so a quick scroll through some of the forums should find you some helpful information, it's worth remembering that the crossover setting is very much dependent on your individual setup and room so we can't offer a definitive answer. :)
     
  3. Ian J

    Ian J
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    The sub should be set in bypass mode so that the crossover is only controlled by the amp and if you have the choice of crossovers I would start by setting the amp crossover at 80Hz and have a good listen with a wide range of material. 80Hz may be a bit low for Kef Eggs so try it at 100Hz and play the same music again and see which gives you the smoothest overall frequency. Obviously the speakers should all be set to small
     
  4. HMHB

    HMHB
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    On the BK xls200 does this mean the "frequency" knob ? If so should it be min or max to be in bypass mode. Sorry about the dumb question :blush:
     
  5. eviljohn2

    eviljohn2
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  6. HMHB

    HMHB
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    Thanks
     
  7. steve0

    steve0
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    My amp is a Denon 2803
     
  8. Chris Bellamy

    Chris Bellamy
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    I believe the ideal is that the crossover to sub should start (at least) 1 octave above the low frequency where the satellite speakers are no longer flat (say the -2to3dB point).

    Chris
     
  9. steve0

    steve0
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    Sorry for sounding dumb but where do i make those settings Thanks
     
  10. Pollywoggle

    Pollywoggle
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    When it comes to octaves I must admit I havent a clue either, what is that in plain english?
     
  11. Mroizouk

    Mroizouk
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    couldn't find the -3dB figure on kef's site, but if u use 80hz, an octave above that would be 160hz. Doubling the frequency represents an octave jump.

    Sounds a bit high for a sub crossover (?)
     
  12. Chris Bellamy

    Chris Bellamy
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    The octave figure is an ideal (via Vandersteen, not known for compromise) to allow smooth and unobtrusive changeover between the "satellites" and sub. Of course, if that ends up being >60Hz or so, then your ears will be able to localise the higher frequencies to the sub, which may bother you more, so compromise is in order for the best overall result.
    Dont forget though that the in room LF response of the speakers will also be boosted c/w published (anechoic) by any placement near walls, and complicated by room modes etc.. If you have the time/inclination/facilities the best is to measure the in-room LF response of your satellites without any bass redirection to the sub (eg: with sound meter or automated software like John Mulcahy's free REq software) , then with sub engaged at your guess crossover, and with that as a visual starting point go from there; failing all that pallava, ears are what really matter anyway.
    HTH
    Chris
     

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