I need a rough estimate of power at .5 ohms

flogger11 · Post by **flogger11** » Sat Jun 07, 2008 9:28 pm

Easiest way: Take two of your voicecoils, wire them in parallel to one side of your amp, do the same for the other voicecoils. Enjoy.

KHPower · Post by **KHPower** » Sat Jun 07, 2008 9:53 pm

flogger11 wrote:Easiest way: Take two of your voicecoils, wire them in parallel to one side of your amp, do the same for the other voicecoils. Enjoy.

Thanks man , Stipud and you have pretty much cleared this for me and I thankyou guys and everyone else

But , I like to fully understand things I have another question that is confusing me , here goes:
Because my amp is 2 channels that is like 2 amps in one. Both see there own ohm load. For some reason i thought if i ran a 1 ohm load on each channel of the amp that the amp would see two 1 ohm loads and combine them down to .5 ohms. Maybe I am confusing myself because i also thought if you wired subs in parallel (like we have talked about) that would lower the ohm load of a particular sub.

So if I parallel the 2 voice coils and each of them being 2 ohm they would then in parallel be 1 ohm and each channel would see 1 ohm.

Let me make this easy LOL if each channel has a 1 ohm load on it , the amp will see 1 ohm total and not combine the channels and try to push .5 ohms right?

Sorry for all the questions but thankyou all

flogger11 · Post by **flogger11** » Sat Jun 07, 2008 9:56 pm

Yep, each channel will have its own 1 ohm load...

KHPower · Post by **KHPower** » Sat Jun 07, 2008 10:28 pm

flogger11 wrote:Yep, each channel will have its own 1 ohm load...

Awesome! Thank You. I am so glad I can use the stuff i have on hand. I've been blowing alot of coin lately and wasnt looking forward to dropping a huge chunk.

I tried discussing this on the realm of excursion but it seems most the time I never get a answer or people will just make fun and what not and a simple qustion ends up turning into something else. Thats why i love this forum , more laid back professionals

flogger11 · Post by **flogger11** » Sun Jun 08, 2008 4:40 am

Two 2 ohm voicecoils in series would give a four ohm load, not what you are looking for. Wire two voicecoils in parallel (then showing a 1 ohm load) to one side of the amp and then do the same for the other side. Man, you are getting super confused. What one side of the amp sees for a load has nothing to do w/ the other unless you bridge it.

KHPower · Post by **KHPower** » Sun Jun 08, 2008 6:34 am

flogger11 wrote:Two 2 ohm voicecoils in series would give a four ohm load, not what you are looking for. Wire two voicecoils in parallel (then showing a 1 ohm load) to one side of the amp and then do the same for the other side. Man, you are getting super confused. What one side of the amp sees for a load has nothing to do w/ the other unless you bridge it.

That answerd my question exactly! Now I know exactly what to to.
I dont know what I was thnking , about the amp combining the ohms of each channel. I will do some wiring later on the amp and test the ohms with a DMM and see my results. it gets confusing looking at all the coil hookups on the sub 1,2 + 1,2- and 3,4- 3,4+ , and what I really dont like and this is a flaw of the manfacturer :there is a dot on each coil that has a indent and then its has a painted dot to show positive or negative. Well all of the coils host this painted dot and they are all red for positve! So you have to look very hard for the + and negative because someone or some machine messed up and put positive paint on all of em.

On a side note I can see how one not familiar with the wiring of this sub could do alot of damage to this thing.

KHPower · Post by **KHPower** » Wed Jun 11, 2008 8:49 am

UPDATE:

Today I wired up the sub to the best of my knowledge. I paralleled Positve 1and 2 to negative 1 and 2 and then did the same to the other set of coils. I then tested the wire lead for the ohm load and I got 1.0 ohm once and then it fell to 0.9 and both sets of paralleld coils measured 0.7 to 0.9 ohms each.

I was going to ask why I didnt get a straight 1.0 ohm on DMM? Is it because the wire is causing resistance?

I figured this was right read out I would get 0.7 to 1.0 so I hooked up both channels on the ZX500 to test and she ran nicely for the power I gave it which was low.

Does this sound about right for the ohm load?

Post by **Jacampb2** » Wed Jun 11, 2008 9:12 am

The basic answer is DC resistance (what you measure with your multimeter) is not the same thing as impedance. Impedance is a function of dc resistance and the interacting magnetic fields of the speaker. Impedance changes as the speaker moves, and the manufacturer will typically list it's average or it's impedance at a specific frequency. Normally DC resistance is not as high as the listed impedance. That is likely why your readings are lower than expected. Most manufacturers also provide a DC resistance spec as well.

Anyhow, it is nothing to be worried about. It sound like you got it right.

Later,
Jason

Post by **fuzzysnuggleduck** » Wed Jun 11, 2008 9:15 am

Edit: I was wrong, but read this link:

http://www.teamrocs.com/technical/pages ... edance.htm

Post by **stipud** » Wed Jun 11, 2008 9:18 am

Yes, that sounds right. Impedance varies depending on the frequency it is playing, so they give it a "nominal" rating. DC resistance is also different than nominal impedance of a speaker, so it's normal for the numbers to be slightly off.

KHPower · Post by **KHPower** » Wed Jun 11, 2008 9:26 am

Great info guy's now I gotta make sure the amp isnt producing a stereo signal