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Reload Thread: Just a question about impedance rise.... Does nominal impedance matter?

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    Just a question about impedance rise.... Does nominal impedance matter?

    Here is the question coming from a noob, brace yourself.

    Does nominal impedance matter as to how much rise or drop there is?
    Example- useing numbers from n3w_3ra's post
    Quote from initial clamp
    Wired to 1 ohm nominal :

    1170 Watts @ 12.5 volts
    1.97 ohms after impedance rise

    Wired to 0.5 ohm nominal :

    1490 Watts @ 11.1 volts
    0.85 ohms after impedance rise


    Ok, so considering there was a rise of .97 when nominal impedance was at 1ohm and rise of .35 from .5ohm. So would it be ignorant to assume possibly with a higher nominal impedance a rise or fall of impedance would be more drastic? Say If I were to wire 4 subs to a 2ohm load think it would rise more than it would with a .5ohm load?

    And please note this is all just theoretically speaking/asking/whatever. Im using this knowledge toward buying a matching amp for my current build. Have 4 dual 4ohm subs on the way and am debating on final impedance to pair with an amp or 2. Either Choice A: Get a large powerful amp (2500+@ 2ohm) and run on 2ohms. Choice B: Get a well made smaller amp (2500+) and run at .5ohm. Or Choice C: a couple of amps and run each pair of subs at 4ohms.
    Also note if it appears im taking this too far out of proportion ill just do what i been thinking, just say fug it buy a lanzar opti4001d and run at .5 ohm for 4000 watts.



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    No bass now but its on the way.
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    Re: Just a question about impedance rise.... Does nominal impedance matter?

    Help a supporting vendor with the purchase of your opti4001 ill even throw in a zero gauge Amp kit for $35




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    Re: Just a question about impedance rise.... Does nominal impedance matter?

    Thankyou and i will keep that in mind!



    Current Setup
    totaled the dodge when a young punk pulled out infront of me doing 60. So the big boom is gone.
    Now in the jeep wj limited. Stock infinity gold system with all alpine speakers and tweeters.
    No bass now but its on the way.
    Reff's- Buck, BassAddictj
    Check my E bay account {rickyp2007} for more feedback (120+)

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    Re: Just a question about impedance rise.... Does nominal impedance matter?

    box rise rarely matters for daily music pounding.

    It is most relevant when playing a test tone in large boxes, like an spl competition perhaps?



    All day I'm clippin'
    voltage be dippin'
    I don't give a damn,
    cause my trunk always hittin'!

    creating a proper sound wave. Step one, turn it up until clipping. Step two, done.

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    Re: Just a question about impedance rise.... Does nominal impedance matter?

    ok i figured i was thinking too much on it. I was just trying not to cheat my obsidian subs. there rated at 600watts conservatively each and i was considering the opti4001 at .5ohm would produce 4000 watts. so that means 1000watts to each subwoofer but counting for possible rise I will probably never get the full 4000 or 1000 per sub. and thats ok for me.



    Current Setup
    totaled the dodge when a young punk pulled out infront of me doing 60. So the big boom is gone.
    Now in the jeep wj limited. Stock infinity gold system with all alpine speakers and tweeters.
    No bass now but its on the way.
    Reff's- Buck, BassAddictj
    Check my E bay account {rickyp2007} for more feedback (120+)

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    Re: Just a question about impedance rise.... Does nominal impedance matter?

    The impedance your amp sees will not be a flat value. It's going to be different at different frequencies (typically the highest near turning) and lower with frequencies away from tuning. In other words - near tuning is where your woofer impedance will rise the most (and thus the lowest power), but at a frequency - say 10hz above or below tuning, impedance is going to be a lower value - and thus the woofers will see more power...

    So yes, it's totally conceivable your woofers will see the full output of the amp - but there's going to be time that they are only see a fraction of the power as well.




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    Re: Just a question about impedance rise.... Does nominal impedance matter?

    Quote Originally Posted by n8skow View Post
    The impedance your amp sees will not be a flat value. It's going to be different at different frequencies (typically the highest near turning) and lower with frequencies away from tuning. In other words - near tuning is where your woofer impedance will rise the most (and thus the lowest power), but at a frequency - say 10hz above or below tuning, impedance is going to be a lower value - and thus the woofers will see more power...

    So yes, it's totally conceivable your woofers will see the full output of the amp - but there's going to be time that they are only see a fraction of the power as well.
    THAT is exactly what I was wondering. Awesome answer man. I do appreciate it! Now I feel safe feeding 1000 watts each when rated 600. The subs will recieve the whole 1kw but only at certain frequencies. It wont be recieveing 1kw continuously unless its playing continuous tones around tuning and less at tuning fq. This makes alot more sense. I figured there was some kind of simply way to put it.



    Current Setup
    totaled the dodge when a young punk pulled out infront of me doing 60. So the big boom is gone.
    Now in the jeep wj limited. Stock infinity gold system with all alpine speakers and tweeters.
    No bass now but its on the way.
    Reff's- Buck, BassAddictj
    Check my E bay account {rickyp2007} for more feedback (120+)

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