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4 ohm and 8 ohm speakers

I have an RCA surround sound system - model no. RT2760. The receiver is RT2760 home theatre receiver., Receiver and speakers are 4 ohm. Equipment specs = amplifier section: RMS output power: dolby mode with 10% total harmonic distortion. All front, center and rear channels are 120 watts 1 KHz, 4 Ohm. The subwoofer channgel is 120 watts (100 Hz 4 Ohm) Total RMS output power, dolby digital mode: 720 W. I want to replace at least the center and subwoofer speakers). What are my options. Can I use 8 ohm speakers (or 6 or ?) with my 4 ohm receiver?

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  • 4 more comments 
  • 25 or 4 to 8 Dec 10, 2007

    You stated "...Two 8 ohm speakers wired in parallel will have a total impedance of 4 ohms. So, if I want to have a different center channel speaker I would do what? Get two speakers rated at 8 ohm each and wire them in parallel and connect to the receiver? If so, exactly how do I do that (explain 'wired in parallel') versus wired in series, and the difference. Also, what about an active subwoofer (8 ohm or ?); okay to connect it to my receiver and fire it up and go? Can I also connect a center channel speaker to an active subwoofer and power the center channel directly from the subwoofer? If so, what do I need to do in that case. Finally, would it just be best to find another 4 ohm center channel and subwoofer? If so, where can I find 4 ohm speakers?

  • 25 or 4 to 8 Dec 10, 2007

    You stated 'a active sub woofer has its own volume and inputs on the speaker'. Would it be best to buy an active subwoofer (which connects to my receiver?) and then connect my center channel speaker directly to the subwoofer? Is there any impedence issues in what you are suggestig (does it matter what ohm each speaker would have to be). Would I still have to connect the center channel speaker to my receiver? Lastly, would it be best to replace my existing 4 ohm center channel and subwoofer with other 4 ohm speakers? If so, point me in the right direction of where I can find replacement 4 ohm speakers (or does it matter with the active subwoofer?).

  • 25 or 4 to 8 Dec 10, 2007

    Comment by 25 or 4 to 8, posted on Dec 10, 2007
    You stated 'a active sub woofer has its own volume and inputs on the speaker'. Would it be best to buy an active subwoofer (which connects to my receiver?) and then connect my center channel speaker directly to the subwoofer? Is there any impedence issues in what you are suggestig (does it matter what ohm each speaker would have to be). Would I still have to connect the center channel speaker to my receiver? Lastly, would it be best to replace my existing 4 ohm center channel and subwoofer with other 4 ohm speakers? If so, point me in the right direction of where I can find replacement 4 ohm speakers (or does it matter with the active subwoofer?).

  • 25 or 4 to 8 Dec 10, 2007

    Please disregard my third reply; it was posted twice.

  • 25 or 4 to 8 Dec 14, 2007

    The idea of paralleling two 8 ohm speakers to achieve 4 ohm may be a good solution, thanks for your input. What I really need is a good source(s) of where I can purchase individual 4 ohm surround sound speakers; speakers that are ready to wire into my receiver and go, not just the 'guts' of a speaker but ones ready to plug and play. I have had trouble finding a company, or companies, that carry the speakers I need. Any help on where to find would be helpful. Lastly, can I use an actice subwoofer in place of the passive subwoofer I currently am using; does it need to be 4 ohm, and can I attach additional speakers to the active subwoofer without drawing power and/or resistance from my receiver? (i.e.; the active subwoofer would provide all the power I would need).

  • miyaba Padella Dec 29, 2013

    you can add but it will not give effect of 8ohms becuse your reciver is design to recive 4 ohms only

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No , placing 8 ohm speakers on a 4 ohm system is not advisable must use 4, even though it will work for a while the extra resistance (ohms) in speaker will end up cooking the output transisiters in amp.

Voltage = Current x Resistance

You could use something like this to reduce out put to speaker.

or wire two speakers say for centre channel together instead, but you need to wire them in parrellel not series...ie centre positive to positive of one 4 ohm then that to other 4 ohm positive and same with negitive.

Parallel..........Two 8 ohm speakers wired in parallel will have a total impedance of 4 ohms

Posted on Dec 09, 2007

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  • Soulvisitor
    Soulvisitor Dec 09, 2007
  • Soulvisitor
    Soulvisitor Dec 09, 2007

    If one replaces a 4ohm with a 8 ohm that channel ie centre will be putting out more power than the other balanced channels, so I guess you could reduce output on that channel and let the amp run at a strain and hope the circiut cut out saves the amp from any possible damage

  • Soulvisitor
    Soulvisitor Dec 10, 2007

    centre wiring would parrallel ie positive out of amp to a 8 ohm speaker positive terminal then to positive of another 8 ohm then the same with negitive line result is a 4ohm speaker













    all said and done why not just get the correct speakers for the amp ie 4ohm



    link to purchase 4ohm speaker

  • Soulvisitor
    Soulvisitor Dec 14, 2007

    Thanks for rating furion, I think I'll leave your subwoofer questions to him.



    Cheers S.

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You can plug in higher ohm speakers , the higher the ohm the higher the resistance is, it is a danger when you plug lower ohm speakers into a higer ohm Amp , at a high volume that will cause them to blow , the center speaker would be fine to use a higer ohm speaker , your best choice is to buy a Active Subwoofer, which means the sub has it's own power supply , and u can blast the thing as much as u like , thn u can turn the bass down on all the other speaker's so u can play it louder , and have the sub turned up has high as u like , this is the best way to get great sound with high volume , buy a Active sub woofer , any active subwoofer is ok , a active sub woofer has its own volume and inputs on the speaker ,

Posted on Dec 09, 2007

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  • Geoff Smith
    Geoff Smith Dec 09, 2007

    With a Active Sub you can also plug other speakers into the back of the sub without using any power from the Amp ,

  • Geoff Smith
    Geoff Smith Dec 09, 2007

    Well thats all nice , never had a problem doing the method i suggested , never cooked a amp , i agree if you were to plug in all speakers with a higher ohm's you could short the output transisiters, that is not going to happen with 1 center speaker , with that model amp it has a inbuilt safety switch , which will shut down the amp if there are any overload problems , i am telling you from my own experience not from what i read in forums

  • Geoff Smith
    Geoff Smith Dec 10, 2007

    beofrei give you anymore advice, may i ask what you are trying to do? if i were to guess when you watch movies you having a hard time hearing voice /talking in the movies??? adding more or a larger center speaker will not help this , the truth is with the type of system you have there, the speakers are made for the Amp and give you the correct sound, spending money on a good Active sub woofer will make that system sound very powerful , because u can turn down the bass on all the speakers which will allow you to turn them right up with a clear sound , and you can use the active sub to control your bass sounds from there on , this method will allow you to hear voice's e.c.t alot more clear

  • Geoff Smith
    Geoff Smith Dec 14, 2007

    yes you can replace the passive sub with a active sub, and can be any sub, 4 ohm e.c.t , as far as finding the speaker to buy , it should not be hard at all , try second hand places , unless u want to buy online , then just use google there will be plenty of places to buy from online , the problem with mixing 2 speakers to the one channel to reduce and split the ohm's is the watts of the speakers will also be reduced , and they will not be as loud , u may get them as loud but they will be sound distorted, atleast not as clear anyway ,

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