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ohm load?


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oxygen65 
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Posted: August 28, 2006 at 6:36 PM / IP Logged  
im trying to figure out the ohm load for some subs. but the only place that i can find a chart is on jl audio's website and here on 12 volt but the one on 12 volt says somethin diffrent that jls site. also the jl site is only for 6 subs. im looking to hook up around 8 maybe more maybe some less. but i dont kno how to figure a the ohm load. they are going to be dual 4 ohm voice coils. so if anyone knows a site that has a chart for a lot of subs and the ohm loads they create that would be great or could someone please just tell me how to figure it out doing math. thanx
cloak559 
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Posted: August 28, 2006 at 8:23 PM / IP Logged  

I would suggest hooking up at least two amplifiers.  Its going to be real hard to find an amp that will put out enough power for eight subs...You can run 4 subs in series/parallel for a 2ohm load on each amp...You could also run 4 amps @ 2ohms each...

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aznboi3644 
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Posted: August 28, 2006 at 9:25 PM / IP Logged  
Well what subs are these???
A 1000 watt rms amp can easily power 8 crappy weak subs...
forbidden 
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Posted: August 28, 2006 at 9:59 PM / IP Logged  

List the number of subs and the voice coils. I can then give you a diagnosis of how to attack this disease.

Top Secret, I can tell you but then my wife will kill me.
Flakman 
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Posted: August 28, 2006 at 10:49 PM / IP Logged  
That is strange that JL's site would say something different. Though they tend to use 3 ohm subs, that might be the cause for the discrepancy.
The Flakman
I feel strange. I have deja vu and amnesia at the same time.
John | Manteca, CA
oxygen65 
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Posted: August 29, 2006 at 6:42 PM / IP Logged  

they are dual 4 ohm voice coils, i know that i could hook 8 of them up to 2 amps and run them at 2 ohms to each amp, but i was wondering what else i could do becuse im not saying 8 is what i want, if i can do more than i want to do more, i would really liketo run them all of one amp so thats why i need a chart or somoene to tell me how to do the math in order to do it.

i was thinking between 6-10 subs. is there anyone that can help?

Flakman 
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Posted: August 29, 2006 at 6:57 PM / IP Logged  

The most helpful thing might be to learn how to calculate parallel and series resistance. Once you have that down, you can figure out how you want your final load regardless of the amount of speakers. It just seems to me that you are asking for a lot of time involved in mapping out the possible configurations for 6 to 10 DVC subs. Of course, I could be wrong, there may be a chart out there....or someone may have the time to map it out for you.

"Give a man a fish, feed him for a day..."

The Flakman
I feel strange. I have deja vu and amnesia at the same time.
John | Manteca, CA
oxygen65 
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Posted: August 29, 2006 at 7:03 PM / IP Logged  

well that amp i was thinking of using is an phd5000 which i think is more power than i will need, but that is besides the point and i know that it is going to be pricey and that is why im trying to figure out to go with that amp or do i need more than one amp.

and flakman if you would read what i wrote before i simply asked someone if they could tell me how to calculate the series and parallel resistance then i would not be having this problem, so if you know it then i would like to kno what it is so i can do the math myself and figure it all out. im not asking other people to really do it for me im just asking for the formula to do it.

Flakman 
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Posted: August 29, 2006 at 7:24 PM / IP Logged  

Understodd oxygen.

Series is easy, simply add up the resistance. R1 + R2 + R3 = Total R  (4 + 4 + 4=12)

Parallel is a little more complicated.   1/(1/R1 + 1/R2 + 1/R3) = Total R  1/(1/4 + 1/4 + 1/4) = 1.33   An easy way that may help is, when having two of the same resistance paralleled, their resistance is than halved. 2 - 4 ohm VC would equal 2 ohm. To maintain a 4 ohm load with 4 ohm DVC subs: Wire both VCs of each speaker in series to make both speakers 8 ohm total. Then wire them together in parallel to bring the set of two subs down to 4 ohms.

I don't know if that was clear enough...maybe someone can word it better. I keep reading it and not liking how I wrote it. Maybe it's just me. Let me know.

The Flakman
I feel strange. I have deja vu and amnesia at the same time.
John | Manteca, CA
oxygen65 
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Posted: August 29, 2006 at 9:20 PM / IP Logged  
ok see now thats what confuses me. becuse using that, that gives me the same things that the calculator on thsi website does, but on jl audios website it says that by wireing 2 dual 4 ohm voice coils together in parallel it says that it is going to make a 1 ohm load? so which one is right?
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