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Bass pickup arrangements or layouts: What has given you the most success?

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  • #16
    I'm still a little confused about the whole polarity reversal thing. If each pickup in your circuit is connected to its own volume and tone pot, wouldn't the two pickups be separate from each other? It's not like the two are wired together in a series or parallel circuit is it?

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    • #17
      Originally posted by shawnl View Post
      I'm still a little confused about the whole polarity reversal thing. If each pickup in your circuit is connected to its own volume and tone pot, wouldn't the two pickups be separate from each other? It's not like the two are wired together in a series or parallel circuit is it?
      The separate volume and tone do not destroy the coherent addition that results from adding two pickups. The tone and volume can affect how the two signal add by altering the amplitudes and phases of the signals and by affecting the impedance looking back into the circuit from the jack.

      For example, suppose you connect two pickups in parallel and connect them to the output jack. The two coil inductances are in parallel, reducing the total inductance. Thus the resonant frequency, formed with the cable capacitance, is higher than with a single pickup. This is still true with volume and tone condrols in place with them turned up all the way, but the situation gets much more complicated if the controls are turned down part way.

      Using a preamp on each pickup and adding through resistors at the outputs of the amps can prevent the change in resonant frequency, but coherent addition still occurs, and some harmonics will reinforce and others tend to cancel. Altering the polarity of one of the pickups has a large effect even with the preamps.

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      • #18
        Originally posted by shawnl View Post
        I'm still a little confused about the whole polarity reversal thing. If each pickup in your circuit is connected to its own volume and tone pot, wouldn't the two pickups be separate from each other? It's not like the two are wired together in a series or parallel circuit is it?
        They are wired together in parallel, with volume pots in-between.
        It would be possible to describe everything scientifically, but it would make no sense; it would be without meaning, as if you described a Beethoven symphony as a variation of wave pressure. — Albert Einstein


        http://coneyislandguitars.com
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