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a passive boost?

Discussion in 'Pickups & Electronics [BG]' started by DubBeats CB, Feb 5, 2006.


  1. Is there any pre amp that can do a passive boost....like the bass has no battery but can boost frequencies. I'm not talk ing a relative boost, where everything else is slightly cut to render a desired bost in the desired frequency. Has anyone been able to accomplish this?:confused:
     
  2. WalterBush

    WalterBush

    Feb 27, 2005
    Yuma, Az
    I believe this would violate the known laws of physics. If anyone's done it, I haven't heard about it.

    BTW, fender mod, that's a great link. I'll be ordering some stuff from them. Thanks!
     
  3. passive "boost" doesn't exist...as jabberwock777 says, "that would be a violation of physics"...

    you could set up a passive tone stack into a gain-only, bypassible preamp...then, when the battery fails, the shape of the tone is maintained, but the level would drop off (depending on the tone-stack and setting, possibly dramatically), but the tone would be maintained.

    my latest project will do precisely that, however, I don't perceive the batteries to die, since it will be powered from an AC adaptor (it's an outboard unit). :)
     
  4. Tryxx

    Tryxx Sputnik Forums: Bass Mod

    Jun 1, 2005
    Hurst, Texas.
    Villex pickups.

    :bag:
     
  5. adept_inept

    adept_inept

    Jan 9, 2006
    supposedly, villex has a special rotary switch for "normal-hot" refering to a mid gain/boost of some type. definitely check it out.
     
  6. Villex is the only one I know of offering something like this. I'm not sure if anyone had an exact idea of how it worked but there was rumour of a tricky little transformer being involved. I've never seen one and apparently its sealed up pretty well, so I can't say on the matter.

    It's not so much violating the laws of physics as it's performing a very clever little side-step of the issue.
     
  7. there's no "clever little side-step" for a law of physics....it either is active and "boosts"(or attenuates) and passive and "attenuates"...

    you can't get something from nothing...many "clever" people have tried and failed...

    often what may appear as a "mid boost" is actually a simultaneous high and low cut...
     
  8. PB+J

    PB+J

    Mar 9, 2000
    arlington va
    It's flat out not possible to have a passive boost--passive means you take the basic signal and subtract energy from it at some frequency point--active means you ADD energy, it's an active circuit


    You can get kind of a relative boost effect. If you cut midrange and treble, you get what the ear hears as more bass. If you cut bass and treble, you get what the ear hears as more midrange. You haven't added any energy to the signal, you've just taken some frequencies away. In some situations cutting bass and treble could sound like a boost, because all the amps power would be going to the punchy mid frequencies.

    IMHO boost is not anybody's friend, it starts to sound kind of artificial and to my ears tiring
     
  9. PB+J

    PB+J

    Mar 9, 2000
    arlington va
    If you lok at that has-sound link you can see he's got a tiny little mini-transformer in there to change--I assume--the frequency range that gets bled to ground. But he doesn't make any claims to boost anything on the passive page
     
  10. Jazzin'

    Jazzin' ...Bluesin' and Funkin'

    Solar-powered bass maybe.
     
  11. nutcracker

    nutcracker

    Sep 3, 2003
    Hi guys,
    William Villex is here. I anderstand it's hard to belive that
    there is way to make that boost. But it's possible!
    I have been demonstrating it at this winter NAMM show.
    Not only mid bost but also low and high boost.
    People who checkd it not a kids and you can't cheet them.
    The names are: Stuart Spector (Spector basses), Joe (Fodera), Carl (lakland), Anderson (Modulus), Bob Taylor
    (Taylor Guitars), Tom Anderson (Anderson guitars),
    Jose (ESP Guitars) Lee Sklar, Jacko III X, And many other top professionals.
    Respectfully,
    William Villex.
    Email me tovillex@aol.com and I will answer your questions
     
  12. Rick Turner

    Rick Turner Commercial User

    Jul 14, 2004
    I design and build electric basses and pickups under the Turner, Renaissance, and Electroline brand names.
    You can use a trasformer to boost voltage at the expense of current. Since the input of a preamp doesn't care about current, it works. If you then put in passive frequency cuts and simultaneously kick in a transformer to boost voltage, you'll get the effect of a passive boost at the chosen frequencies. You can also use coil taps to kick output up and down, and then put passive filters in.

    It's smoke and mirrors, but can work. But why? Passive does not automatically equal better...
     
  13. Rick...you're right, of course, about using a transformer to boost voltage...

    the main misgiving I have about putting a transformer into a passive electronic circuit is this...FREQUENCY RESPONSE...why muddy the waters with an additional inductive load???

    Holy Phase-Shifting, Impedance-Matching Bat Contraptions, Batman!!!


    Me...I'll stick to high-quality, low-noise linear amplification circuits, or RC passive filters, as required.
     
  14. anonymous278347457

    anonymous278347457 Guest

    Feb 12, 2005

    you could have an awesome finish on a bass like that. but its useless for all bassists in the UK like me :crying:
     
  15. instigata

    instigata

    Feb 24, 2006
    New Jersey
    i talked to villex the other day. and he claims that yes, indeed, does he boost the signal.

    the standard mid attenuator is just that. a mid attenuator. but his new rotary switches actually boost the signal for a normal, hot, and very hot setting.
     
  16. ...and with a passive pickup as your "bank" you have very little to spend!