Amp 4 Ohm Speakers 8 Ohm miss-match

Discussion in 'Amps [BG]' started by mgivens78, Dec 30, 2013.


  1. mgivens78

    mgivens78

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    Quick question for electronics gurus...I have a pre-Fender SWR Redhead 4 Ohm combo and purchased 2 Eminence speakers to beef up the sound and they are 8 Ohms. Can I used them and what issues could i expect with the mis-match Ohms?
    Thanks for the help; I'm new to forum and this is my first post. GREAT site!
     
  2. B-string

    B-string Gold Supporting Member

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    Are you using the new speakers as replacements in the combo? If you are chance are good the original speakers were wired in parallel and those two new 8 ohm speakers wired in parallel will again be a 4 ohm load.

    Welcome to TB!
     
  3. mgivens78

    mgivens78

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    Yes I am using them as replacements. I will check the speaker Ohms and the wiring when I get into the replacement. I hope you are right and all will be perfect.
    Thanks B-String!
     
  4. B-string

    B-string Gold Supporting Member

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    I think you will find the original speakers are 8 ohm units. The only two ways to get a 4 ohm load from two speakers is parallel 8 ohm units or series wire 2 ohm speakers. Ordering 2 ohm special wound speakers would be VERY expensive to the manufacturer and limit where else they could be used. :)
     
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  6. BassmanPaul

    BassmanPaul Gold Supporting Member

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    The only caveat that I see is that, mounted in the combo, your new drivers might actually be a downgrade. You need to measure the internal sizes of the speaker compartment, plug them into a box design program such as WinISD and see if your particular box needs to be tweaked.
     

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