Cumulative Spectral Decay (CSD)

megasat16
megasat16 Posts: 3,521
edited April 2011 in DIY, Mods & Tweaks
Question to a few DIY speakers builder among polkies.

Is CSD fact or fiction? :biggrin:

I am a CSD believer though. The measurement may be somewhat flawed but better than FR plots to decide the driver performance.
Trying out Different Audio Cables is a Religious Affair. You don't discuss it with anyone. :redface::biggrin:
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  • geoff727
    geoff727 Posts: 546
    edited April 2011
    Fact. While a speaker and/or speaker system may have a frequency response that's flat as a pancake (and thus highly marketable to the public), the real story is not told about it's transient response and what people perceive as "tightness" and "cleanliness" in the bass until the effects of it's decay results are borne out.

    There is an excellent chapter dedicated to this in "Loudspeakers For Music Recording and Reproduction" by Newell and Holland. A great read.
    Polk SDA SRS 2
    Polk RTA 15tl
    Polk Monitor 7C
    Polk Lsi9
    Infinity RS-II (modded)
    Infinity RS-IIIa (modded)
    Infinity RS 2.5 x 2
    Magnepan 1.6QR (modded)

    System: http://forum.audiogon.com/cgi-bin/fr.pl?vevol&1290711373
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  • megasat16
    megasat16 Posts: 3,521
    edited April 2011
    Geoff,

    Thanks for the suggestion on a good book. I've ordered one through Amazon since it has excellent reviews.

    CSD provides better data set of the driver responses than just a simple FR plot. I am looking into lots of drivers and many doesn't come with CSD plots yet. I hope it'll change one day.

    Cheers,
    James
    Trying out Different Audio Cables is a Religious Affair. You don't discuss it with anyone. :redface::biggrin:
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  • Face
    Face Posts: 14,340
    edited April 2011
    Good luck with that. I wish more came with distortion plots too.
    "He who fights with monsters should look to it that he himself does not become a monster. And when you gaze long into an abyss the abyss also gazes into you." Friedrich Nietzsche
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  • FTGV
    FTGV Posts: 3,649
    edited April 2011
    megasat16 wrote: »
    Is CSD fact or fiction? :biggrin:
    Fact,it will show delayed resonances (ringing) since it's looking at the time domain.
    CSD provides better data set of the driver responses than just a simple FR plot. I am looking into lots of drivers and many doesn't come with CSD plots yet. I hope it'll change one day.

    Cheers,
    James
    Zaph usully does a CSD plot as part his driver measurement routine,though he only has a sampling of the popular drivers.http://www.zaphaudio.com/5.5test/compare.html
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  • geoff727
    geoff727 Posts: 546
    edited April 2011
    megasat16 wrote: »
    I've ordered one through Amazon since it has excellent reviews.

    Outstanding! I hope you enjoy it as much as I do.

    G~
    Polk SDA SRS 2
    Polk RTA 15tl
    Polk Monitor 7C
    Polk Lsi9
    Infinity RS-II (modded)
    Infinity RS-IIIa (modded)
    Infinity RS 2.5 x 2
    Magnepan 1.6QR (modded)

    System: http://forum.audiogon.com/cgi-bin/fr.pl?vevol&1290711373
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