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OBP-2 Concentric Pot Wiring

Discussion in 'Pickups & Electronics [BG]' started by Meg Learmonth, Jul 5, 2019.


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  1. Jul 5, 2019 #1
    Meg Learmonth

    Meg Learmonth

    Oct 28, 2017
    Hi all :)

    I've searched the forums for quite a while and I can't seem to find the answer I'm looking for so here I am, yet again adding to the pile of pre-amp wiring questions... Sorry!

    Here's my query:

    My current bass build has Aguilar 4 string PJ passive pickups. I'm going to install the Aguilar OBP-2 preamp too so I'll have the option to run it active or passive with a DPDT on-on switch.

    I'd like to have a concentric pot to control the bass/treble to save some space as I'm not too keen on having a cluttered setup. The Aguilar diagram says it needs a "Dual 50k Lin." concentric knob - Does this mean that the whole stack is 100k, or that they both add up to 50k?

    Also, when running passive will I be able to change the tone using these knobs or will I have to install a passive tone knob too?

    I've attached my wiring diagram I've made, bit awful but you get the jist!

    wiring.jpg
    Hopefully I've explained myself well without rambling on! Thanks for your help!
     
  5. Jul 5, 2019 #2
    Matt Liebenau

    Matt Liebenau

    Jul 7, 2013
    Ogden, Utah
    Meg Learmonth likes this.
  9. Jul 5, 2019 #3
    Meg Learmonth

    Meg Learmonth

    Oct 28, 2017
  13. Jul 5, 2019 #4
    Matt Liebenau

    Matt Liebenau

    Jul 7, 2013
    Ogden, Utah
    I’m not familiar with the Aguilar pre’s. They could have a feature to let that work but, as far as I know, you’ll need a separate passive tone control that is, presumably, only in the passive part of the circuit.

    Also, if the DPDT switch in the bottom right is the preamp bypass I think it’s drawn wrong but, again, Aggies could have something I don’t know about.
     
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  18. Jul 5, 2019 #5
    Meg Learmonth

    Meg Learmonth

    Oct 28, 2017
    Thanks for the help! I've tried to scrounge together my wiring from Aguilar's here - http://www.aguilaramp.com/wp-content/uploads/wiring-diagram-obp-2-v2.pdf
     
  22. Jul 5, 2019 #6
    Matt Liebenau

    Matt Liebenau

    Jul 7, 2013
    Ogden, Utah
    Ok. I was mistaken. Now that I looked closer at the diagram, the switch, as on their website, is right. I was stuck in the way I would wire the switch and misinterpreted their diagram at first.
     
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  26. Jul 5, 2019 #7
    Crater

    Crater

    Oct 12, 2011
    Dallas, TX area
    Yes, just wired like a passive jazz bass.

    A dual-ganged pot is not the same as a dual concentric.
     
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