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Reload Thread: Single Sub Wiring for 2Ohm load?

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    marcopolo's Avatar
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    Single Sub Wiring for 2Ohm load?

    Just a theoretical question (to broaden my knowledge):

    If I had a single voice coil sub with the Impedance of 4Ohms, and a amp that would be 2 Ohm stable, could I wire an ordinary 4 Ohm resistor in paralel with the sub in order to power from the amp as a 2Ohm load (for more power) ?

    Thanx.



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    resister would eat power...if you bridged the amp to the single 4 ohm sub the amp would see a 2 ohm load cause 4 ohm mono = 2 ohm stereo 2 ohms mono = 1 ohm stereo.....remember bridging is two channels so the applicable mono load that is safe will be double the impedence of the stereo rating



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    Thanx.



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    Originally posted by audiolife
    resister would eat power...if you bridged the amp to the single 4 ohm sub the amp would see a 2 ohm load cause 4 ohm mono = 2 ohm stereo 2 ohms mono = 1 ohm stereo.....remember bridging is two channels so the applicable mono load that is safe will be double the impedence of the stereo rating

    WTF???

    If the amp is 2 ohm stable MONO, that means more than likely each channel is 1 ohm stable stereo. Ok I think that is what you meant., I think.

    But if you bridge an amp that is 2 ohm, you are bridging the amp not the sub. The sub is still a 4 ohm sub. And the amp will only see it as 4 ohms, not as 2 ohms.

    Now if you did like he said and put a 4 ohm resistor in parallel with the sub, yes it would see a 2 ohm load.




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    when you bridge an amp you are wiring 2 channels in series to make 1 thus when BOTH CHANNELS (now being one) the impedence is seen as 1/2 across the outputs.
    (If I had a single voice coil sub with the Impedance of 4Ohms, and a amp that would be 2 Ohm stable, could I wire an ordinary 4 Ohm resistor in paralel with the sub in order to power from the amp as a 2Ohm load (for more power) ? )
    lets face it when people see numbers there is a difference in "stable" and putting out with 90% meaning 2 ohm stable stereo...now if you are talkin class d mono blocks its diff cause you dont have to bridge the amp also the resister as i said before would be pretty stupid to run. way back in the day they used accumatches (funky impedence inductor coils) that you could "set" the impedence up without losing power..thing is with this set up the speakers and amps fell to alot of voltage spikes thus they never really cought on



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    Audiolife, man.. you know your stuff. Do you sit there and read books or something? (If so, what books?) :p



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    Ok I see what you were saying, Yea you are right.




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    Well, thanx to all of ya!

    It seemed stupid to me too, do wire up a resistor, since it is a "parasite" - meaning it eats up some power.

    I didn't think it will flame up such a debate! As I said, it was just a hypothetical question.

    Thanx anyway!!!



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    Originally posted by EarDrummin.
    Audiolife, man.. you know your stuff. Do you sit there and read books or something? (If so, what books?) :p
    no not really i just been doin this awhile. competed won lost repped a few lines went to school for eet and i am mecp certified its just basic stuff..u learn the electrical side of it it all falls together



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