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  1. #1

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    Default WTH is Slope Control???

    I was looking at the back of one of the subs at Ultimate last weekend...it was the KEF 2150 and found something new to me...

    There is a switch called "slope control" marked 12/24dB that is not explained. Do you have any idea what this is for?

    The KEF web site gives few details.
    Main HT
    Magnepan 1.6QR fronts, POlk R15 surrounds, Pioneer SC-25, Parasound Halo A23, Oppo BDP-105, Panasonic TC-P60ZT60, Sony PS3, Apple TV

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  2. #2

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    It probably changes the crossover from 2nd order (12 dB per octave) to 4th order (24 dB per octave). It would add flexibility and could be useful depending on what speakers you use.
    Graham

  3. #3

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    Originally posted by gatemplin
    It probably changes the crossover from 2nd order (12 dB per octave) to 4th order (24 dB per octave). It would add flexibility and could be useful depending on what speakers you use.
    Can you expound just a bit? When you say "2nd order (12 dB per octave)"...what does that mean?
    Main HT
    Magnepan 1.6QR fronts, POlk R15 surrounds, Pioneer SC-25, Parasound Halo A23, Oppo BDP-105, Panasonic TC-P60ZT60, Sony PS3, Apple TV

    Bedroom System
    Polk Blackstone TL3, Polk PSWi225 Wireless Sub, HK 3490 Integrated, Oppo BDP-103, Sharp Aquos 32" TV, Apple TV

    Office Rig
    27" iMac w/Amarra, AudioQuest Dragonfly 1.2, Focal XS Book, Schiit Valhalla, Cypher Labs Theorem 720, Philips Fidelio X1, Sennheiser HD600, HiFiMan HE-500, B&W P7, LG 47LM7600, Sony PS3, Apple TV

  4. #4

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    All filters have slopes (i.e., how quickly they ramp down the signal). Slope is measured in units of dB/octave.

    The steeper the slope, the higher the order of the filter.

    1st order = 6 dB/octave
    2nd order = 12 dB/octave

    and so forth.

    Typical low pass filters on subwoofers are 4th order, but most AVR's impose a 2nd order high pass on the mains, and there is a mismatch of slope. The ability to alter the slope of the filter to achieve parity with the corresponding high pass is a really nice feature.

    Doc
    "What we do in life echoes in eternity"

    Ed Mullen (emullen@svsound.com)
    Director - Technology and Customer Relations
    Specialty Technologies
    SVSound

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    Default

    Man, there is a friggin HILARIOUS answer to the intial question, but I can't bring myself to post it.

    Cheers,
    Russ
    Check your lips at the door woman. Shake your hips like battleships. Yeah, all the white girls trip when I sing at Sunday service.

  6. #6

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    Wink

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  7. #7

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    Originally posted by RuSsMaN
    Man, there is a friggin HILARIOUS answer to the intial question, but I can't bring myself to post it.

    Cheers,
    Russ
    well let's hear it then...
    Main HT
    Magnepan 1.6QR fronts, POlk R15 surrounds, Pioneer SC-25, Parasound Halo A23, Oppo BDP-105, Panasonic TC-P60ZT60, Sony PS3, Apple TV

    Bedroom System
    Polk Blackstone TL3, Polk PSWi225 Wireless Sub, HK 3490 Integrated, Oppo BDP-103, Sharp Aquos 32" TV, Apple TV

    Office Rig
    27" iMac w/Amarra, AudioQuest Dragonfly 1.2, Focal XS Book, Schiit Valhalla, Cypher Labs Theorem 720, Philips Fidelio X1, Sennheiser HD600, HiFiMan HE-500, B&W P7, LG 47LM7600, Sony PS3, Apple TV

  8. #8

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    Originally posted by RuSsMaN
    Man, there is a friggin HILARIOUS answer to the intial question, but I can't bring myself to post it.

    Cheers,
    Russ
    I was thinking the same thing ... but I don't think I'll go there ...

  9. #9

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    Freakin Spec...Name says it all..

    Pauly
    Life without music would

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