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  #1  
Old 10-14-2010, 12:25 PM
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Default Someone please clarify this for me.

Ohm rise.
Could someone explain ohm rise for me?
What causes it? Can it be prevented?

My 2 JL 10w7's are wired to 1.5ohms right now. But is it really running @ around 2ohms?

If i want to run something @ 1 ohms, should i just set my subs to .5 ohms?
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Old 10-14-2010, 12:32 PM
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The reason the resistance changes is because of the structure of the speaker. If your speaker kept close to the same resistance throughout the frequency range, you'd get vastly different SPL across the frequency range. Mind you the drivers impedance is a variable impedance, not a set impedance.
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Old 10-14-2010, 12:46 PM
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Impedance rise is caused when the coil moves in a magnetic field. The only reason you get a single value when you put a DMM on the terminals of the woofers is because they're not moving. Try pushing on the cone and watch the meter. You'll see different resistance values. It is also caused by the way the woofer loads in the box, the way the air flows in/out/around the box, etc. There are several factors to it. You cannot prevent it. The only way to find what impedance you're rising to is to clamp your amp's power output at several frequencies to establish your impedance curve. Then you'll have a better idea what kind of rise you're getting over the frequency range of your woofers/box/setup.
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  #4  
Old 10-14-2010, 01:00 PM
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Just get rid of them for something that don't use a plastic coil former, they sound good tho
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Old 10-14-2010, 01:05 PM
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Quote:
Originally Posted by atomic_bronco2 View Post
Just get rid of them for something that don't use a plastic coil former, they sound good tho

whats that have to do with it? all subs are going to have this issue.
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Old 10-14-2010, 01:58 PM
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So when i buy 2 DVC sub and want to run it @ 1ohm.
Should i get a dual 4?
or dual 2? cause in reality after rise dual 2 will be close to 1 ohm?
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Old 10-14-2010, 02:01 PM
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D2 in parallel will give you 1 ohm. D4 in parallel will give you 2.
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Old 10-14-2010, 02:05 PM
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wonder if there's any way to predict impedence rise of a given setup (with any accuracy) for those of us that don't have access to a clamp meter
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Old 10-14-2010, 02:10 PM
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due to the amount of variables going on, i really don't think there is.
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Old 10-14-2010, 02:11 PM
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Quote:
Originally Posted by thisistiny View Post
So when i buy 2 DVC sub and want to run it @ 1ohm.
Should i get a dual 4?
or dual 2? cause in reality after rise dual 2 will be close to 1 ohm?
2 x D4's gives you 1 ohm. 2x D2's gives you .5 ohms (all parallel). There's no way of knowing what your rise will be until you build your setup. You could wire down to .5 and you may rise to .75 or you may rise to 7.5 ohms. You won't know until you build. Plus, impedance rise changes with frequency. So at your peak, your rise may be to 4 ohms, but at some other frequency your impedance may even go down, hence why running amps at .5 that aren't designed to be run there is not a good idea.

Quote:
Originally Posted by bd5034 View Post
wonder if there's any way to predict impedence rise of a given setup (with any accuracy) for those of us that don't have access to a clamp meter
Not that I know of. Maybe one of the more experienced competitors would have some info on that.
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