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idea preamp

Discussion in 'Pickups & Electronics [BG]' started by GODSBASSMAN, Mar 22, 2009.



    Feb 2, 2005
    S. Carolina
    Who would build an on board preamp this way ?
    bass: 100 Hz
    mids : 1000 Hz
    no treble circuit
    master volume
    passive/active on/off
    :D Or am I nutz?
  2. Nope not nuts i don't think. I'm actually trying to find an internal preamp at the moment that will have only Bass and Mid boost/cut, which i can put on a stacked pot. I want the following set up for my preamp for my current single cut design.

    Bass/Mid boost and cut - Stacked Pot
    single volume(push/pull for passive active)
  3. Angus

    Angus Supporting Member

    Apr 16, 2000
    Palo Alto, CA
    Why do you pick 100 and 1000 hz?
  4. CyberSnyder

    CyberSnyder Gold Supporting Member

    Jun 19, 2003
    I Endorse Alien Audio Basses
    Audere is the most flexible of the preamp designs. Personally, I'd just get the treble knob and not touch it.


    Feb 2, 2005
    S. Carolina
    Well...Demeter just emailed me that his BEQ is 120Hz, 1K and 4K. I can keep the treble at completely cut. That should work just fine.
    Angus: I recorded flat bass line and then played with a graphic EQ to come up with those centers that pleased my ears..then EQ'd that on my live bass preamp/amp and it was the same ear pleasing tone. Bear in mind I have a set of Q tuners run thru volume to jack on the bass. I love it crisp and clear. I want to hear the strings. 30 - 50Hz seems too low to me when I play out. Give me definition or death. :D :hyper:


    Feb 2, 2005
    S. Carolina
    That's should be easy... just don't wire in the treble pot, wire the bass and mid to a concentric pot, volume on a push pull for bypass.
  7. cnltb


    May 28, 2005
    hardy at musiciansounddesign.com appears to do custom stuff and his onboard stuff is absolutely excellent.
    You may find something there.


    Feb 2, 2005
    S. Carolina
    cnltb, Thanks. Will check it out, brother.
    Peace. David
  9. cnltb


    May 28, 2005
    All good. I
    really hope you'll get somewhere with it
    Good Luck!!:)
    He may also be able to cook you up some custom onboard thing.
    I wouldn't be surprised.


    Feb 2, 2005
    S. Carolina
    Demeter - made here in USA. Ordered - 2 week ETA.I thank you all.
    Peace. david
  11. Why I need treble...

    To me, treble with a CF below 6.5k is useless as it only adds “harshness” and not “sparkle”…

    But as strings begin to die…I use my treble control to compensate…I’ve found that 10k works well to bring the shine back to an old string…
  12. Jim C

    Jim C Is that what you meant to play or is this jazz? Supporting Member

    Nov 29, 2008
    Bethesda, MD
    Thanks for this post.
    Have been frustrated that the big name bass EQ preamp designers (Sadowsky, Aquilar, etc) use approx 50Hz as the bass boost center frequency, when I much prefer 100 to 150 Hz as a boost point both in the studio and with my Trace Elliot.


    Feb 2, 2005
    S. Carolina
    You are welcome. We all may not be in the same boat but some of us are going in the same direction.


    Feb 2, 2005
    S. Carolina
    That's cool. You know where you are at and why you are there.

    For me, I am hearing "bass" not sparkle. When my strings lose their tone, I change them. (Good for the economy AND my ears).
    Peace always. David


    Feb 2, 2005
    S. Carolina
    Well, received Demeter's BEQ on board pre yesterday and installed it. It does the trick and then some. Even with all tone knobs fully cut my Clement singlecut custom #122 Q tuner BL6 dual pickup system is really musical and yet with knobs all on boost still sounds like my bass. Never over EQ'd. Never had that experience before. WOW. Bass tone doesn't BOOM, mid not HONKY, treble not HARSH. Did I say I love it. I loved my Clement before now I'm.....
    happy, happy, happy.
  16. not quite...you'll need a substitute for the treble pot.

    if the preamp is a boost/cut...then substitute the treble pot for either two resistors that equal centre detente or a trim pot in the cavity...

    for example if the originall treble pot is 20k then us 2x10k resistors and wire it like a pot, using the "join point" of the two resistors in series as the wiper...does that make sense?

    if the preamp is boost-only, generally you can tie the three pot wires together...depends on the circuit
  17. SGD Lutherie

    SGD Lutherie Banned Commercial User

    Aug 21, 2008
    Bloomfield, NJ
    Owner, SGD Music Products
    If you like it crisp you don't want to wire the treble completely cut, you want to wire it flat. Wiring it cut will remove crispness.

    I agree about the bass frequency. You can't hear 50Hz, but you can feel it. I use between 80-100Hz when I EQ my bass for the low end, depending on the bass. Since it's a shelving filter the lower stuff is stil there. Lately I've been setting the mids at about 400Hz. But usually I set them about 1.5K. I'd still include a treble control. You never know when you might need to boost the top end. I like doing that on the neck pickup.


    Feb 2, 2005
    S. Carolina
    The preamp came all wired up except to tie in the bridge ground and the pups. I left the treble in the circuit and drilled the appropriate holes and it is just beauteous.
    I should have used the words "quick attack" vs "crisp" ? I like the treble subdued, mellow, smooth, etc. Really a rather continuous tonal character throughout the full range, if that make sense.
    Thanks. David
  19. I would call that tonal characteristic "flat treble"...maybe pulled back a tad...but definitely not rolled off...

    Just where I'm at, maybe...but I find treble control more useful than mids...

    mids only come into play for me when I'm using bridge pickup primarily and need to bring out the "bark" a little...


    Feb 2, 2005
    S. Carolina
    That is what I like about this Demeter pre. CF = 120 Hz / 1000 Hz / 4 K.
    The BEQ has a much more focused EQ curve compared to most others that I know about.
    30-50Hz, 400-800Hz, and up to 10-16K is a BIG spread. I can leave my amp and BEQ centered (even the treble knob) and have very pleasing bass tone. My church gig is more orchestral and I don't need to "feel" the low frequencies that would be required for a dance gig or oldies concert; I have other basses for that sort of genre.

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