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Bass, Mid & Treble pot wiring

Discussion in 'Pickups & Electronics [BG]' started by Aislinn, Feb 19, 2014.

  1. Aislinn

    Aislinn

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    I saw a video demo on a Fender American Deluxe Dimension Bass with HH pups. It had bass, mid and treble controls as well as a 5-way switch.

    I'm kind of new to guitar electronics so I was wondering how you would wire the pots in this situation? Is it just a matter of soldering in different caps?

    If anyone has a wiring diagram or knows where to find one, please share.
  2. Lownote38

    Lownote38

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    The Dimension is an Active bass, so there's a pre-amp in there. The EQ is active which enables it to be split into low/mid/high knobs. Every pre-amp design is different, so there isn't really one way to wire a bass that way.
  3. line6man

    line6man

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    As stated, that bass has a preamp.

    Trying to do it passively is rather problematic. Firstly, you can only cut frequencies, rather than boost. Second, there tends to be volume drops and weird behavior when using the controls.

    Treble cuts are typically done with standard tone control wiring.

    Bass cuts are typically done by placing a capacitor in series with the signal path, and using a pot to vary the resistance across the capacitor. Low frequencies are blocked by the capacitor, but the pot allows you to add them back, at an adjustable level.

    Mid cuts are typically done in the same fashion as standard tone controls, but there is an inductor added in series with the capacitor, to block high frequencies from being able to shunt to ground. This, combined with the capacitor that blocks low frequencies, allows only a certain window of frequencies to be shunted to ground.
  4. Aislinn

    Aislinn

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    When I was watching the demo, the guy showed the back of the bass for a second. I thought I saw a battery box cover. But when he played it, I didn't hear the amplified sounds I've heard on other active pickups. So I thought maybe that little black cover I saw might have been a wiring access panel.

    Thanks for the explanations. Much appreciated!
  5. rojo412

    rojo412 You're entering a world of bass... Supporting Member

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    Proprietor, ACF Custom
    It's an active bass. There are passive pickups going into an active preamp.
  6. line6man

    line6man

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    Being active or passive has nothing to do with tonality. There is no inherent difference.
  7. Lownote38

    Lownote38

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    It has a lot to do with the wiring and tone controls, though. That's what the original post was about.

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