Determine Ohm?

[95BlackGA 5,000+ posts]

I have a cheap DMM, and I want to determine what ohm load some of my speakers have. What setting do I put it on?

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[Immacomputer 10+ year member]

It's best to just use the math. Using a DMM will give you the Re or the DC Resistance, which is NOT the same as the actual impedance your amp will see.

How many subs do you have and what voice coil configuration are they?

To determine the final load for coils or speakers in series is like this:

R1 + R2 + R3 + R4 = Rtotal ; where R represents the resistance of each speaker or coil.

For parallel wiring, this is how you determine the final load:

1/R1 + 1/R2 + 1/R3 + 1/R4 = 1/Rtotal

It's pretty simple math and google can basically do it for you. You can also google calculators if you **** at math.

 

[IgnoreMe 5,000+ posts]

It's best to just use the math. Using a DMM will give you the Re or the DC Resistance, which is NOT the same as the actual impedance your amp will see.
How many subs do you have and what voice coil configuration are they?

To determine the final load for coils or speakers in series is like this:

R1 + R2 + R3 + R4 = Rtotal ; where R represents the resistance of each speaker or coil.

For parallel wiring, this is how you determine the final load:

1/R1 + 1/R2 + 1/R3 + 1/R4 = 1/Rtotal

It's pretty simple math and google can basically do it for you. You can also google calculators if you **** at math.

i believe your missing the numerator which should be 1. like this

at least thats what ive been taught. or maybe im misunderstanding you...or it could be that i didnt listen close enough when i was taught lol

 

[IgnoreMe 5,000+ posts]

nvm i just did the math. same thing just written differently

 

[thch 10+ year member]

the formulas are the same. The first versions leaves everyting as conductances (1/R). the second converts the form to give resistances.

 

[IgnoreMe 5,000+ posts]

the formulas are the same. The first versions leaves everyting as conductances (1/R). the second converts the form to give resistances.

im more visual so i guess it helps to see it as a "picture" if you will.

btw, nice quote in the sig. fox news //content.invisioncic.com/y282845/emoticons/crap.gif.7f4dd41e3e9b23fbd170a1ee6f65cecc.gif

 

[AK SloPok 10+ year member]

For the record, I used a DMM once all of my subs are connected to make sure I am in the right "ballpark" this can identify an issue before you hook it up to the amp.

 

[bose301s 5,000+ posts]

It's best to just use the math. Using a DMM will give you the Re or the DC Resistance, which is NOT the same as the actual impedance your amp will see.
How many subs do you have and what voice coil configuration are they?

To determine the final load for coils or speakers in series is like this:

R1 + R2 + R3 + R4 = Rtotal ; where R represents the resistance of each speaker or coil.

For parallel wiring, this is how you determine the final load:

1/R1 + 1/R2 + 1/R3 + 1/R4 = 1/Rtotal

It's pretty simple math and google can basically do it for you. You can also google calculators if you **** at math.

And the actual impedance varies by frequency, so a 4 ohm rating is really just a weighted average. Doing the DC resistance is just about as accurate.