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EQ curves of common bass preamps (Music Man, Seymour Duncan, Warwick) [56K warning]

Discussion in 'Pickups & Electronics [BG]' started by uOpt, Jul 29, 2014.


  1. uOpt

    uOpt

    Jul 21, 2008
    Boston, MA, USA
    [crossposted from seymourduncanforums]


    Since I went through the trouble of measuring I can as well post it here.

    This is all done with pink noise. I had separate runs with sweeping sine and sweeping square but as expected, these linear distortion units (aka equalizers) don't behave differently for that than for pink noise.

    Note that the red line is always the reference pink noise, the original signal.

    Preamps in use:
    • Seymour Duncan's 3-band bass preamp
    • Music Man's bongo 4-band
    • Music Man's 3-band as found in a 2000 non-classic stingray
    • Music Man's 2-band as found in 2011 Stingray Classic 5
    • Warwick's active MEC 3-band as found in a PH German-made thumb




    std_pink_treble:
    [​IMG]

    std_pink_mids:
    [​IMG]

    std_pink_bass:
    [​IMG]



    std_bass_singray2band_max:
    [​IMG]

    std_bass_singray2band_min:
    [​IMG]

    std_bass_bongo_max:
    [​IMG]

    std_bass_bongo_min:
    [​IMG]

    std_bass_seymourduncan_max:
    [​IMG]

    std_bass_seymourduncan_min:
    [​IMG]

    std_bass_stingraythreeband_max:
    [​IMG]

    std_bass_stingraythreeband_min:
    [​IMG]

    std_bass_warwickthreeband_max:
    [​IMG]

    std_bass_warwickthreeband_min:
    [​IMG]
     
    blindrabbit likes this.
  2. blakelock

    blakelock

    Dec 16, 2009
    sweet data dump!
    thanks
     
  3. uOpt

    uOpt

    Jul 21, 2008
    Boston, MA, USA
    BTW, taking suggestions on how to represent the data in a more digestable manner :)
     
  4. khutch

    khutch Praise Harp

    Aug 20, 2011
    suburban Chicago
    Here are the curves for the Fender preamp found in MIM and MIA basses from a few years ago and maybe still today.

    FenderPreampChart2.jpg

    BTW, I think that if you subtract the pink noise input curve from your output curves before you plot them you will get graphs that present the preamp response in a more standard format.
     
  5. Does this bass have the original MM 2-band circuit?
     
  6. PluckyThump

    PluckyThump Supporting Member

    Jan 4, 2008
    The Hammer
    Interesting, thanks for posting. The Stingray 3-band looks like the most sensible design, with the roll-off below 30hz, whereas all the others are radically boosting below 30hz. Also note how the 3-band cuts below 60hz when the mid or treble is boosted.
     
  7. uOpt

    uOpt

    Jul 21, 2008
    Boston, MA, USA
    Right. I didn't make up my mind yet whether that is clearly better. The pink noise isn't perfect and the curves normally drawn are heavily smoothend out.

    If I do neither then people can just judge for themselves.
     
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    Primary TB Assistant

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    Mar 3, 2021

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