how to determine ohm load?
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=29879
Printed Date: May 14, 2025 at 1:13 AM
Topic: how to determine ohm load?
Posted By: soundquality
Subject: how to determine ohm load?
Date Posted: April 07, 2004 at 3:20 AM
I am sure that you guys think this is going to be a stupid question I am wanting to know with out going to a site of any sort how do you guys determine the determine the ohm load? thanks and I hope this question is OK to ask
Replies:
Posted By: mobile1
Date Posted: April 07, 2004 at 3:45 AM
there are mathmatical equations to determine this. it is simplified in the parallel and series section on this page
Posted By: soundquality
Date Posted: April 07, 2004 at 4:11 AM
but can you tell me what the ohm load of a setup with 5dvc 4ohm is? if so can you explain how you figured it out (without looking at a chart or forumla) you are the best thanks I am a girl too so Im not the best at this I understand alittle but I would like to know how to figure it out with out a equation (in my Head) thank you Mobile 1
Posted By: Ketel22
Date Posted: April 07, 2004 at 4:15 AM
you need to know the load of the sub's or speaker's voice coil or coils. if you run a direct line from one voice coil to the amp of h/u the ohm loador impedence is that of the voice coil. if you run a series circuit during the wire run to the amp you effectively half the impedence (raise the number by multipuls of two for every series circuit) when you run a parallel circuit in the wire run from the voice coils to the amp or h/u you effectively raise the impedence (divide the original voice coil's impedence by 2) ------------- Quad L Handyman services
Posted By: Ketel22
Date Posted: April 07, 2004 at 4:19 AM
you asked for the impedence of 5 4ohm dvc, i assume you are refering to subs. you need to tell or depect how you wired the voice coils. you could have the subs wired any where from .4 ohms if you ran it all in parallel to 40 ohms if you ran them all in series. if you elaborate on how you wired the speakers i can help you further.
imo. being a female is no excuse for anything.
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Quad L Handyman services
Posted By: soundquality
Date Posted: April 07, 2004 at 4:20 AM
lets try it with 4 4ohm svc = 1ohm load 4 4dvc=2 but now then 5 how are you going to get that answer???
Posted By: soundquality
Date Posted: April 07, 2004 at 4:22 AM
am sorry for my error sir, that would make a difference wouldnt it, I was meaning parrell
Posted By: Ketel22
Date Posted: April 07, 2004 at 4:24 AM
from those anwsers you have everything run in parallel, is this for an actual setup or just hypothetical. if an actual set up i could help you alot more if you gave me the desired ohm load, or the load your amp is stable at. ------------- Quad L Handyman services
Posted By: soundquality
Date Posted: April 07, 2004 at 4:28 AM
hypothetical if thats ok, I understand that a amp is stable at certain ohm loads, this maybe be a dumb thing to be asking but I am just racking my brain trying to figure out the ohm load of any given setup, other than your basic setups if you know where I am coming from thanks for taking your time to help me Ketel
Posted By: soundquality
Date Posted: April 07, 2004 at 4:32 AM
Ketel is this a dumb thing to be asking? do you have too memorize everything in order to be able to come up with a ohm load for any certain setup, or like say for yourself does it take a second or two to come up with a ohm load if asked in person?
Posted By: Ketel22
Date Posted: April 07, 2004 at 4:36 AM
5 dual 4 ohm subs in parallel would come out to a 0.4 ohm load on your amp, most amps are not stable at less than 2 ohm with the exceptions of corse.
if you think of the number voice coils instead of the number of subs the problems become easier. if you have 4-4ohm voice coils in series you would have a 16 ohm load, just add the impedences together. if you take those same 4-4ohm voice coils and put them in parallel you would end up with a 1 ohm load, easy way to figure is the impedence over the number of voice coils.
in your situation with 5 dual 4ohm voice coils you would have a total of 10-4ohm voice coils. by putting the impedence of the voice coils over the number of voice coils you will get 0.4 ohms with would be the impedence if you ran all of the voice coils in parallel.
everything gets a little more complicated when you start using series and parallel together but the same rules apply except the circuits become like a single voice coil with the lower or higher impedence. if you ran 4-4ohm voice coils in a parallel-series you would take the first two voice voils and put the impedence over the number of voice coils, which will become 2ohms this then would be treated as if it where a single voice coil in your thinking instead of the two in parallel.
if confused i can try to elaborate more.
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Quad L Handyman services
Posted By: Ketel22
Date Posted: April 07, 2004 at 4:38 AM
the only dumb questions are the ones un asked, you can only learn from your questions and mistakes, this is why the forum was created to join the world in teaching each other and aiding each other with things we do not yet know. and to help those who want to enter the car audio world to learn from our mistakes rather than to have to make the same ones again. ------------- Quad L Handyman services
Posted By: soundquality
Date Posted: April 07, 2004 at 4:42 AM
:-) the one that got me was the 3rd paragraph :-) are you meaning like say 5-4dvc 4ohm is like 10-4ohm subs :-) thats it right, thank you I feel like I am dumb now that was simple thank you sir for your help, I was thinking that it was going to be a long hard road for me to figure this out. thanks again K ;-)
Posted By: Ketel22
Date Posted: April 07, 2004 at 4:44 AM
i havent decided if your up really late or really early but no problem
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Quad L Handyman services
Posted By: soundquality
Date Posted: April 07, 2004 at 4:48 AM
just up late how about you? 5am almost
Posted By: Ketel22
Date Posted: April 07, 2004 at 4:52 AM
almost midnight, never can sleep b4 2am for some reason :-P but this is what pm is for not the forum, not to be mean. but feel free to pm me ------------- Quad L Handyman services
Posted By: soundquality
Date Posted: April 07, 2004 at 4:53 AM
working nights are not any fun at all.
Posted By: Ketel22
Date Posted: April 07, 2004 at 4:54 AM
well welcome to the 12volt forum
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Quad L Handyman services
Posted By: soundquality
Date Posted: April 07, 2004 at 4:57 AM
Thank You
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