Three tone controls?

Discussion in 'Basses [BG]' started by Ross AriaPro, Jan 23, 2014.


  1. Ross AriaPro

    Ross AriaPro

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    Dec 27, 2013
    Has anybody installed three tone controls on your passive instrument...one bass, one mid, and one treble.

    So you dont have to mess with your amp between songs.

    Is this even possible?
  2. M0ses

    M0ses

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    Uuuh......that's most active preamps.......
  3. line6man

    line6man

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    There are thousands of basses with three-band preamps. Maybe hundreds of thousands.
  4. Ross AriaPro

    Ross AriaPro

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    Dec 27, 2013
    I mean a passive bass with three traditional tone controls...nothing with a battery.
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  6. Selta

    Selta

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    [DEL]No.[/DEL]

    Edit: See below from others and myself.
  7. line6man

    line6man

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    Yes, but it is uncommon, because mid controls tend to cause noticeable volume drops.

    Bass cuts are common on G&L basses. You simply run the signal in series with a capacitor, and place a pot parallel to it.

    Mid cuts are generally done with band-stop filters consisting of a pot in series with a capacitor, in series with an inductor, with the whole thing parallel to the signal path.

    Treble cut controls are simple LPF tone controls.
  8. Ross AriaPro

    Ross AriaPro

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    Dec 27, 2013
    Thanks for posting...have you ever seen a wiring diagram for three controls?
  9. Marcus Willett

    Marcus Willett Supporting Member

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    Yes it is, but it's a bit tricky. Villex makes a passive 3-band EQ system for bass (I have one of his systems installed in one of my 5 strings).

    In the strictest sense it's a cut-only system, the differences coming from a reduced overall output, but on the plus side it sounds really good. Bottom line: it can be done, but you don't get something for nothing. There's a reason why it's very unusual and not commonly seen.
  10. Selta

    Selta

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    Ahhhh. For some reason I was assuming boost + cut. The above would work, just would take up a chunk of room in the control cavity.
  11. Jeff Scott

    Jeff Scott Don't just TalkBass - PlayBass! Supporting Member

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    I think with the above information you can easily draw your own wiring diagram. ;)
  12. Ross AriaPro

    Ross AriaPro

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    Dec 27, 2013
    I'll check that out thanks!

    This is the G&L system for guitar.
  13. awilkie84

    awilkie84 Supporting Member

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    Yes it is. It all depends on which capacitors you use. It's not as versatile as an active EQ, but it can be done.
  14. Selta

    Selta

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    Yeah, I called myself out on it. I was under the assumption OP meant boost + cut. Just another shining example of what assuming does ;)
  15. Templar

    Templar Supporting Member

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    Yes, a Modulus Genesis jazz passed thru my hands a few years ago. It had Villex pickups, all passive, with a mids control as I recall. Seemed to work "okay" but not nearly as effective as an active system.
  16. CoarseBass

    CoarseBass

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    :scowl:

    Gibson Rippers have passive mid and treble controls.

    G&L's use passive treble and bass controls.

    I've never seen anyone use all three, but there is no physics that prevents. I'm not sure all that cutting is a good idea in a pure passive circuit, but it can be done.
  17. Marcus Willett

    Marcus Willett Supporting Member

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    Well that's the thing. It can be boost and cut (this being relative) if the overall level is reduced and that is the new "flat" and you EQ from there. My Villex system works this way. The output reduction (all controls flat) is not enough to be a problem and the EQ works quite well.
  18. groooooove

    groooooove

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    just get an active bass, or a preamp in a pedal.
  19. Selta

    Selta

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    Cutting lows + his != boosting mids, though it may sort of sound like it.

    I'm kind of curious what all these systems do in regards to the loading of the pickups?
  20. Jeff Scott

    Jeff Scott Don't just TalkBass - PlayBass! Supporting Member

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    Rickenbacker did the same on a couple of models, too.
  21. Ric5

    Ric5 Supporting Member

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    Passive controls can only bleed off volume, treble, bass or middle to ground.

    SOOOO

    If you bleed off treble, and bleed off middle and bleed off bass what is left to come through?

    Your amp conmtrols are active they can boost.

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