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  1. #1

    Default General xo question

    With a given xo for a tweeter and single woofer, would the xo change if you were to add an additional woofer as in a mtm.

  2. #2

    Default Re: General xo question

    absolutely - you're changing the impedence of the woofer circuit

  3. #3
    Join Date
    Nov 2007
    Location
    Lil' Rhody
    Posts
    3,210

    Default Re: General xo question

    Quote Originally Posted by Zero the Hero View Post
    absolutely - you're changing the impedance of the woofer circuit
    Yes, Furthermore since you are differing the woofer's impedance and increasing the output with another, you will need to tweak the tweeter circuit as well.

  4. #4
    Join Date
    Sep 2005
    Location
    Appleton
    Posts
    5,889

    Default Re: General xo question

    Quote Originally Posted by mzisserson View Post
    Yes, Furthermore since you are differing the woofer's impedance and increasing the output with another, you will need to tweak the tweeter circuit as well.
    Additionally, you can get CLOSE to what's needed:

    If you're halving the woofer's impedance (two 8 ohmers in parallel), cut the coil value in half, and double the values of any caps. If you've got a Zobel, double THAT cap, and halve that resistor too. You gain approx. +6dB in woofer output, so decrease any tweeter attenuation by about 6dB as well.

    If you're doubling the woofer's impedance (two 4 ohmers in series), then just double up any coil or resistor values, and halve any caps. This arrangement does NOT net you any extra woofer sensitivity, so the high pass on the tweeter should be OK.

    Chris

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