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  1. #1

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    Default Question about parallel resistors

    I have two 1 Ohm resistors in parallel, why does my VOM still read it as 1 Ohm?
    Last edited by Kenneth Swauger; 05-18-2013 at 02:55 PM.

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    They could be out of spec.

    http://www.1728.org/resistrs.htm
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    According to that calculator, 2 x 1ohm resistors in parallel is 1 ohm. So that changes a lot in all those crossovers using 2 x 1ohm mundorf mox resistors in place of a 2 ohm resistor, if that is true.

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    How did you get the calculator to spit out 1 ohm for two 1-ohm resistors in parallel? It [correctly] says 0.5 ohm for me.

    Crossovers using two 1-ohm resistors in place of a 2-ohm resistor would have them in series.
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  5. #5

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    Yes, 0.5 correct.


    Quote Originally Posted by blairfrischx View Post
    How did you get the calculator to spit out 1 ohm for two 1-ohm resistors in parallel? It [correctly] says 0.5 ohm for me.

    Crossovers using two 1-ohm resistors in place of a 2-ohm resistor would have them in series.

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    Quote Originally Posted by nduitch View Post
    According to that calculator, 2 x 1ohm resistors in parallel is 1 ohm. So that changes a lot in all those crossovers using 2 x 1ohm mundorf mox resistors in place of a 2 ohm resistor, if that is true.
    What crossover is this?
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    Depending on where it is in the crossover, it may or may not make a significant difference. If it's in the parallel leg of a woofer crossover, before or after a cap, it will affect the woofer's roll off on the top end. Changing out to a smaller value will affect the woofer's top end roll off, making it roll off sooner. This may affect phase integration, possibly create a small hole or dip in response, and maybe even lower distortion. In other words, it may not do anything offensive and require a change, but I would need to see what speaker, and where in the crossover this value exists to confirm.
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    The leads of your DMM may add some resistance to what you measure good leads cost a lot and so does a a accurate DMM what are you using and when is the last time you sent it out to be calibrated?
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    I had the resistors wired in parallel, thinking they would double up. I wired them in series and the value is much closer.

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