Ohm's

[iceman1110 10+ year member]

Just wondering if this is normal or if something is weird. I have a 15" rl-p dual 4 ohm. It's wired in the box already in parallel and I put my multimeter on it and it says 1.4ohm. Shouldn't it be at 2?

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[netherland24 5,000+ posts]

thats fine...

 

[SAG3 5,000+ posts]

close enough

and you'll probably get more power out of your amp

 

[iceman1110 10+ year member]

close enoughand you'll probably get more power out of your amp

Just waiting for it to get here //content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif

 

[lifted95blaze 10+ year member]

ohms are hardely ever what there said to be, most 4 ohm coils are around 3.7, as long as its in the ballpark

 

[thch 10+ year member]

Just wondering if this is normal or if something is weird. I have a 15" rl-p dual 4 ohm. It's wired in the box already in parallel and I put my multimeter on it and it says 1.4ohm. Shouldn't it be at 2?

when the coil is not in motion, the impedance will be Re.

notice that tapping the cone will mess up the impedance reading.

 

[iceman1110 10+ year member]

when the coil is not in motion, the impedance will be Re.
notice that tapping the cone will mess up the impedance reading.

I had to try that to see if it did, it went up to 9-10 ohms when I did it. Cool stuff.

 

[CBFryman2 5,000+ posts]

OMFG!!!!!!

Impeadance is resistance to flow of ALTERNATING CURRENT!!!!! which will ALWAYS be higher than Resistnace which is resistance to flow of DIRECT CURRENT...you measured resistance...hence it being lower than Impeadance which is rated as NOMINAL impeadance as impeadance is constantly changing with frequincy and voltage due to the fact that as current increases impeadance drops and the higher the frequincy the greater the conductor is affected by inductance.

it is also affected by the enclosure which it operates in.

this board is n00bx land centreal

 

[CBFryman2 5,000+ posts]

and tapping the cone causes a flase reading only because you are creating a small (very small) voltage by moving the coil through the magnetic feild.

 

[thch 10+ year member]

OMFG!!!!!!...and voltage due to the fact that as current increases impeadance drops...

this board is n00bx land centreal

there has to be an appropriate word for this.

in anycase, in linear devices you don't see the voltage or current really being an issue. basically, as current increases voltage increases (or decreases for negative resistance).