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The John East preamp club

Discussion in 'Pickups & Electronics [BG]' started by datsaxguy, May 16, 2013.


  1. ctmullins

    ctmullins fueled by beer and coconut Gold Supporting Member

    Apr 18, 2008
    MS Gulf Coast
    I'm highly opinionated and extremely self-assured
  2. ctmullins

    ctmullins fueled by beer and coconut Gold Supporting Member

    Apr 18, 2008
    MS Gulf Coast
    I'm highly opinionated and extremely self-assured
    For Sale - John East P-Retro
     
  3. wes stephenson

    wes stephenson Supporting Member

    Dec 18, 2009
    Dallas Texas!!!!
    Sure. I read that. I’m not super techy. It’s not a badge of honor but a legitimate declaration of ignorance. I don’t understand how the bass knob and the upper and lower bass freq “window” thing (combined with the wheels) work together. I’m honestly just asking for somebody to post a link to a video demonstration or a more detailed printed explanation if they have or know of one. Or if you can clearly explain it I’d love to hear that too. Thanks!
     
  4. Storius-GVA

    Storius-GVA

    Jun 21, 2017
    Switzerland
    So here are a few tech EQ words that are important to understand the bass window feature.
    Shelf: can be high or low or whatever frequencies you want, it has a Frequency Value and then everything underneath or above is boosted of a decided amount (gain)
    Example bass shelf at 40Hz with +4dB: everything underneath 40Hz is boosted at the same value, then after 40Hz, it goes back to flat.
    This is the kind of EQ setting there's in most onboard Preamps and it's what makes the East so great to me, because all the preamps I've tested always had super low frequency for bass and it makes the sound very muddy.

    Now there's another type of EQ setting it's called the Band EQ or Peak EQ:
    Basically there's a frequency chosen to be boosted or cutted, and a bandwidth (also called Q) that's going to affect how you're affecting the frequencies around the selected one.
    For example: 250hz band EQ at +4dB with a tight bandwidth: imagine a spike at 250Hz almost like a needle.
    If you enlarge the bandwidth, you go from a spike to a wave.

    So to come back to the East, the bass window settings are opening at 20 up to 80 Hz for the lower part of the bass window and closing at 40 up to 200 for the higher setting.
    Lower setting controls when your bass window starts. High setting controls when it finishes.
    (Technically there's an impossible spot like open at 80 and close at 40... )

    So it means you have a band EQ for your bass with appropriate settings. You can go LOW at:
    20 - 40 Hz (medium bandwidth) and then the knob you have on your bass for bass will control the gain of bass...
    Or you can go super large bandwidth at
    40 to 200 Hz, which comes into the lower mids area.
    Or you can put a meaty solid bass setting without having sub-frequencies at: 60 - 100 Hz or 80 - 100 Hz.

    But if anyone played with these settings could they tell us what settings they have chosen?

    I hope my explanation was clear enough for you to understand this great East feature.
     
    Last edited: Dec 13, 2018
  5. DaveAceofBass

    DaveAceofBass Supporting Member

    Feb 20, 2004
    Charlotte, NC
    Are there any indication on the white wheels what frequency is selected, or do we do it by ear? I have a Uni-Pre getting installed on my bass.
     
    wes stephenson likes this.
  6. Storius-GVA

    Storius-GVA

    Jun 21, 2017
    Switzerland
    That I don't know but the factory settings can be found on the PDF (page 6):

    -flat response
    -mid control ON
    -Bass window : 20-60Hz / boost and cut
    -treble shelf frequency 4kHz

    There's no mention about the wheels settings but I suppose CW would go up in frequency.
    But as I don't have one yet, I don't know how they work exactly. Is there a limit to the wheel's angle?
    There's letters written above the white wheel but what do they correspond to?
    When seen in this angle on the picture:
    IMG_20181213_113345.jpg
     

    Attached Files:

    bebi and 5StringPocket like this.
  7. wes stephenson

    wes stephenson Supporting Member

    Dec 18, 2009
    Dallas Texas!!!!
    That helped! Still not completely hip yet but I’ll be reading your tutorial several more times to get my head around it. Thank you for taking the time to explain that!
     
    Storius-GVA likes this.
  8. Sumaru

    Sumaru Never stop learning Supporting Member

    May 16, 2013
    Jesus Murphy that's a nice bass.
     
    Andrew Future likes this.
  9. baszslap

    baszslap

    Feb 19, 2006
    Bucharest
    here goes, this might be non-sense so talk some sense into me :)) All my basses are passive and also vintage so i don't really want to mess with them but i really want to try the filter based preamp (eq-01 i guess). Do you thing i can put it into a pedal and use it like this? any idea?
     
  10. J.Wolf

    J.Wolf Supporting Member

    Apr 29, 2003
    Asheville, NC
    Contributor- Bass Musician Magazine
  11. desert_rain

    desert_rain

    Jul 14, 2015
    Eindhoven
    Hi J East fans. Uni pre doesn't work with 18v right?
     
  12. Storius-GVA

    Storius-GVA

    Jun 21, 2017
    Switzerland
    It does work with 18V
    It's specified in the FAQ of the east UK website.
     
  13. J.Wolf

    J.Wolf Supporting Member

    Apr 29, 2003
    Asheville, NC
    Contributor- Bass Musician Magazine
    To be clear, my post with that link was in response to your query
     
    baszslap likes this.
  14. Clark Dark

    Clark Dark

    Mar 3, 2005
    earth
    I don't think the EQ-01 will work in a pedal form. Go to the AC Guitars website and look at the construction of that pre.
     
  15. baszslap

    baszslap

    Feb 19, 2006
    Bucharest
    i saw it, thank you. i was interested in the filter preamps but at this price i think i wanna try it as well
     
    J.Wolf likes this.
  16. J.Wolf

    J.Wolf Supporting Member

    Apr 29, 2003
    Asheville, NC
    Contributor- Bass Musician Magazine
    Oh right, the ACG style. my bad. I bet john would build one into a box for you. He's very cool about stuff like that.
     
    baszslap likes this.
  17. Andrew Future

    Andrew Future Commercial User

    Oct 3, 2018
    Photographer
    Maruszczyk passive - Volume, Volume & Tone. And very good it was, too.

    The J-Retro is akin to a bass on performance-enhancing drugs. Without legal issues or threat of sanction.
     
  18. 5StringPocket

    5StringPocket Supporting Member

    Jan 11, 2006
    Texas
    Does anyone know the mounting depth required for a Uni-pre?
     
  19. Storius-GVA

    Storius-GVA

    Jun 21, 2017
    Switzerland
    You need minimum 3 cm of depth to be able to install the uni pre comfortably.
    Also watch out the overall space you have.
    For example in my ibanez SR5005 prestige, it is very tight.
    I bit more and it wouldn't fit.
    The EQ module is quite big and takes a lot of room.
    But then once it's working, it's amazing and works like a dream.

    Good luck
     
    5StringPocket likes this.
  20. SteveCS

    SteveCS

    Nov 19, 2014
    Hampshire, UK
    Well I've just arrived in the world of John East after installing a MMSR 3-band in my '91 StingRay.
    Out with the old...
    20190125_090445.jpg ...and in with the new...
    20190125_111410.jpg
     
    5StringPocket and OldFunBass like this.

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