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Series / Parallel switching for Speaker Cabinet

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  • PFDarkside
    replied
    Re: Series / Parallel switching for Speaker Cabinet

    Originally posted by regan View Post
    You’ll notice in the documentation that it states at maximum a doubling of load impedance is ok. (4 ohm amp and 16 ohm speaker is not OK). For solid state this is ok.

    Also, I’d trust this advice for manufacturers that explicitly mention you can mismatch impedance. Not all amps are built with the robustness of Mesa Boogies.

    Leave a comment:


  • regan
    replied
    Re: Series / Parallel switching for Speaker Cabinet

    Originally posted by PFDarkside View Post
    This is only true with solid state power amps.
    Nope, It's quite OK

    https://mesa-boogie.imgix.net/media/...d%20Hookup.pdf

    Leave a comment:


  • PFDarkside
    replied
    Re: Series / Parallel switching for Speaker Cabinet

    Originally posted by regan View Post
    So long as the impedance of the cab is greater than the impedance of the amp you can use it.

    If you wire the cab at 16 ohms you can use it with 4,8, & 16 ohm amp outs
    This is only true with solid state power amps.

    Leave a comment:


  • regan
    replied
    Re: Series / Parallel switching for Speaker Cabinet

    Oh so it is,I missed that sorry

    Leave a comment:


  • devastone
    replied
    Re: Series / Parallel switching for Speaker Cabinet

    Originally posted by regan View Post
    this is just giving you one (2 speakers together) load at 16 ohms or 2 individual loads (2 speakers in stereo) at 8 ohms each
    It's 4 ohms mono on the left top jack.

    Leave a comment:


  • regan
    replied
    Re: Series / Parallel switching for Speaker Cabinet

    Originally posted by Darg1911 View Post
    Depending on the existing input type/size, this could be your easiest solution. It was virtually a drop in for one of my cabinets. If the input dish is smaller, the cabinet back can pretty easily be enlarged to accomodate.

    https://www.tubesandmore.com/product...lay-monostereo


    this is just giving you one (2 speakers together) load at 16 ohms or 2 individual loads (2 speakers in stereo) at 8 ohms each

    Leave a comment:


  • regan
    replied
    Re: Series / Parallel switching for Speaker Cabinet

    So long as the impedance of the cab is greater than the impedance of the amp you can use it.

    If you wire the cab at 16 ohms you can use it with 4,8, & 16 ohm amp outs

    Leave a comment:


  • ArtieToo
    replied
    Re: Series / Parallel switching for Speaker Cabinet

    Originally posted by Dave Locher View Post
    What kind of switch should one use?
    Simple DPDT on-on. But, obviously, rated for the power. A typical AC power switch would be more than sufficient.

    Leave a comment:


  • IM4Tone
    replied
    Re: Series / Parallel switching for Speaker Cabinet

    Originally posted by Darg1911 View Post
    Depending on the existing input type/size, this could be your easiest solution. It was virtually a drop in for one of my cabinets. If the input dish is smaller, the cabinet back can pretty easily be enlarged to accomodate.

    https://www.tubesandmore.com/product...lay-monostereo


    Originally posted by IM4Tone View Post
    This doesn't look right to me, but maybe I'm just not following your diagram correctly. HERE (7th from top) is a diagram for a DPDT switch to achieve 16 or 4 ohms (8 ohms isn't available with this configuration). Switch boxes are available for sale that are pre-wired.
    Exactly!

    Leave a comment:


  • Darg1911
    replied
    Re: Series / Parallel switching for Speaker Cabinet

    Depending on the existing input type/size, this could be your easiest solution. It was virtually a drop in for one of my cabinets. If the input dish is smaller, the cabinet back can pretty easily be enlarged to accomodate.

    https://www.tubesandmore.com/product...lay-monostereo


    Last edited by Darg1911; 06-21-2019, 05:37 AM.

    Leave a comment:


  • Dave Locher
    replied
    Re: Series / Parallel switching for Speaker Cabinet

    What kind of switch should one use?

    Leave a comment:


  • ArtieToo
    replied
    Re: Series / Parallel switching for Speaker Cabinet

    The way to switch two speakers between series and parallel, is exactly the same as how to switch a humbucker between series & parallel. Use the Duncan diagram and pretend one speakers wire is +black and -white, and the other speaker is +red & -green. Use a slightly heavier duty switch, however.

    Click image for larger version

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    Last edited by ArtieToo; 06-17-2019, 08:33 PM.

    Leave a comment:


  • IM4Tone
    replied
    Re: Series / Parallel switching for Speaker Cabinet

    This doesn't look right to me, but maybe I'm just not following your diagram correctly. HERE (7th from top) is a diagram for a DPDT switch to achieve 16 or 4 ohms (8 ohms isn't available with this configuration). Switch boxes are available for sale that are pre-wired.

    Regarding "And does it matter whether the tip or ring of the speaker cable goes to positive on the speaker?" .....If you are using this cab as a stand alone only, the importance is that both speakers are wired +/- the same to eliminate phase cancelling. If you plan on using this cab with another, tip is +, barrel is -. So, best to wire tip to +.

    Leave a comment:


  • andyg_prs
    started a topic Series / Parallel switching for Speaker Cabinet

    Series / Parallel switching for Speaker Cabinet

    Hi,

    I have a 2 x 12 speaker cab that is 16 ohms. It is two 8 ohm speakers in series. I use it with an Engl Ironball that has a 16 ohm output.

    I also want to use the cab with an amp that only has 4 and 8 ohm outputs. Putting the two 8 ohms in parallel will give me 4 ohms.

    So, I can re-wire for impedence matching for either amp, but not both.

    I've tried to sketch out the wiring for a switch to flip from one mode to the other.....can anyone confirm if this is correct? And does it matter whether the tip or ring of the speaker cable goes to positive on the speaker?

    Click image for larger version

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    Thanks,
    Andy
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