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How to get to1 ohm, on six 4 ohm subs.

Printed From: the12volt.com
Forum Name: Car Audio
Forum Discription: Car Stereos, Amplifiers, Crossovers, Processors, Speakers, Subwoofers, etc.
URL: https://www.the12volt.com/installbay/forum_posts.asp?tid=78845
Printed Date: May 08, 2024 at 6:22 PM


Topic: How to get to1 ohm, on six 4 ohm subs.

Posted By: mikemcd620
Subject: How to get to1 ohm, on six 4 ohm subs.
Date Posted: June 07, 2006 at 4:32 PM

Is there like a resistor that i can use to get from .66667 ohms to 1 ohm?



Replies:

Posted By: gregory863
Date Posted: June 07, 2006 at 5:33 PM
what amp are u running?

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I can eat fifty eggs




Posted By: haemphyst
Date Posted: June 07, 2006 at 5:46 PM
No. Whatever resistor (actually, a .3 ohm resistor) you add into that will waste 1/3 of your amplifier power IN the resistor. Want to know how much that is? At 1000 watts, that's 330 watts. A .3 ohm, 350w resistor will be huge. Sounds to me like you chose the wrong woofers, mang! You need 2 ohm woofers, wired in series parallel for 1.3 ohms, but with common woofer values (8, 4, or 2 ohms) you cant get 1 ohm with 6 of them. I know JL used to make 6 ohm woofers, and DVC 6 ohm woofers, but I don't know if they still do.

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It all reminds me of something that Molière once said to Guy de Maupassant at a café in Vienna: "That's nice. You should write it down."




Posted By: mikemcd620
Date Posted: June 07, 2006 at 6:05 PM
well its a orion xtr pro 1000 and i guess ill just have to do it another way then  . . . I was going to get 2 alpine type r's or a type x, anyway, so o well. the subs that i was going to hook it to were hunks of junk anyway, but i was bored and was thinking of making a good huge box just to see how they would sound. but if it aint going to work, then screw it. maybe ill run a diamond d6 or something idk, do you think that will be too much power? cuz if i go with the alpines then it'll be fine but you COULD give them more power.




Posted By: gregory863
Date Posted: June 07, 2006 at 6:59 PM
i've had lots of guys say that the impedence will rise high enough with just the wire connections that .6666 would be ok on a real 1ohm stable amp. i would have to have 1-0 wiring to the amp and a high output alternator to try it though. you could parrell three woofs and series it to get around a 2.6 ohm load. is you amp 2 or 1 ohm stable? that would be cool with the right box. also these 6 woofs are single voice coil or dual? cuz if they're dual 2 ohm you could paralell 3 1ohm loads to around .5 and series that to 1.

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I can eat fifty eggs




Posted By: geepherder
Date Posted: June 07, 2006 at 9:40 PM
I like the sig- I was thinking of changing mine to "I can eat fifty-one eggs."  Just kidding- can you humor us and tell us a story behind that?

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My ex once told me I have a perfect face for radio.




Posted By: Steven Kephart
Date Posted: June 08, 2006 at 1:29 AM

gregory863 wrote:

i've had lots of guys say that the impedence will rise high enough with just the wire connections that .6666 would be ok on a real 1ohm stable amp.

That is possible.  Also keep in mind that impedance ratings are many times inaccurate.  Just measure the DCR of different subwoofers with 4 ohm ratings and you will see values all over the place.  It is possible that those subs impedance won't go below 1 ohm, even though the math shows a final impedance of .6 ohms. 





Posted By: gregory863
Date Posted: June 09, 2006 at 12:06 PM
ya'll need to watch cool hand luke. especialy you big box types. try to be like luke.

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I can eat fifty eggs




Posted By: gregory863
Date Posted: June 09, 2006 at 6:17 PM
yeah steve but measuring with a regular meter is kind of iffy. i think that a meter that will give you a truly accurate reading of the impedance of a woof cost's around 2k or so. i know just about every meter i've ever used reads a 4ohm woof at around 5 ohms.

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I can eat fifty eggs




Posted By: geepherder
Date Posted: June 09, 2006 at 7:55 PM
I did a search on Google and found the reference.  That's funny.  I did the gallon of milk in thirty eight minutes once.

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My ex once told me I have a perfect face for radio.




Posted By: aznboi3644
Date Posted: June 09, 2006 at 11:23 PM
But....did you throw up...lol me and friends at school have the "gallon challenge" once in a while...Everyone ends up puking.




Posted By: Steven Kephart
Date Posted: June 09, 2006 at 11:46 PM

gregory863 wrote:

yeah steve but measuring with a regular meter is kind of iffy. i think that a meter that will give you a truly accurate reading of the impedance of a woof cost's around 2k or so. i know just about every meter i've ever used reads a 4ohm woof at around 5 ohms.

Sure if you want to measure the impedance curve.  But all we are concerned with is the lowest the impedance will drop so the amplifier won't be strained beyond it's design.  That is technically what the impedance rating is.  Also keep in mind that with a multimeter you aren't measuring the impedance, but the DC resistance.  Impedance is the total resistance produced by resistance, inductance, and capacitance in an AC circuit and it varies with frequency.





Posted By: gregory863
Date Posted: June 10, 2006 at 10:40 AM
so with the bullet proof wiring and power i described this guy could run this .66666 impedance but the 1-0 wiring and high out put alternator would cost more than new woofs.

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I can eat fifty eggs




Posted By: geepherder
Date Posted: June 10, 2006 at 10:26 PM
Nope, didn't puke, but wished that I could.  Man did that hurt.

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My ex once told me I have a perfect face for radio.




Posted By: aznboi3644
Date Posted: June 11, 2006 at 2:13 AM
Damn...no puking...i gotta give you props for that.





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