2 ohm sub reads 1.8 ohms

[Xanthous 10+ year member]

My alpine swr-1222d reads 1.8 ohms, i bought it used. I've heard a lower # means the coils been hurt.

Thoughts?

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[09civic 5,000+ posts]

no, its completely fine.

 

[Falcons 5,000+ posts]

throw it away

dont confuse him lol. the ohms on a sub can fluctuate between .3-.4 ohms either way. your good bro. if you see crazy numbers like 13, then it randomly goes to 5, then 6 then 10, thats a blown coil.

 

[brynm 10+ year member]

What you are reading is the dc resistance (dcr) which is lower than the subs impedance. Sub is fine.

 

[mylows10 5,000+ posts]

sub is fine they dont always read exactly 2ohm or 1 ohm

 

[Xanthous 10+ year member]

Alright thanks guys. Would it read higher or lower if it was blown?

 

[Bassin Buick]

Alright thanks guys. Would it read higher or lower if it was blown?

depends. it can go both ways , usually ends up in a higher number though , or infinite number because the coil is open.

 

[KyleBechtold 5,000+ posts]

is this just one coil? if so your all good..

 

[Xanthous 10+ year member]

is this just one coil? if so your all good..

they are dvc subs.

 

[audioholic 5,000+ posts]

What you are experiencing is the difference between a speaker's published/nominal impedance, and its actual impedance. Subs are published as 1ohm, 2ohm, 4ohm, 8ohm, etc to simplify the specs for the average consumer. But the actual impedance of a speaker is rarely exactly a whole number. This is because the impedance of a speaker is determined by its voice coil (the size/type/length of the wire in the coil, and the mat'l type used to make that coil). The manufacturer builds the coil to meet certain specs they want to achieve (like coil height, winding width, number of layers, flat wound or not, etc). In other words, if they want a 8-layer coil that is 2" tall with a certain gap distance, they are going to wind the coil to meet those specs. They will not turn it into a 9-layer coil, or change the whole geometry of the motor to make the coil 2.1" tall, jsut to hit some nominal whole number when measuring actual coil resistance (impedance). Thus if the manufacturer builds the coil to meet all their specs, and the result is a 1.8ohm resistance, they will simply publish it as a "2ohm coil".

 

[brynm 10+ year member]

What you are experiencing is the difference between a speaker's published/nominal impedance, and its actual impedance. Subs are published as 1ohm, 2ohm, 4ohm, 8ohm, etc to simplify the specs for the average consumer. But the actual impedance of a speaker is rarely exactly a whole number. This is because the impedance of a speaker is determined by its voice coil (the size/type/length of the wire in the coil, and the mat'l type used to make that coil). The manufacturer builds the coil to meet certain specs they want to achieve (like coil height, winding width, number of layers, flat wound or not, etc). In other words, if they want a 8-layer coil that is 2" tall with a certain gap distance, they are going to wind the coil to meet those specs. They will not turn it into a 9-layer coil, or change the whole geometry of the motor to make the coil 2.1" tall, jsut to hit some nominal whole number when measuring actual coil resistance (impedance). Thus if the manufacturer builds the coil to meet all their specs, and the result is a 1.8ohm resistance, they will simply publish it as a "2ohm coil".

Just a nitpick... He is not measuring impedance with a meter he is reading the dc resistance of the wire in the coil.

 

[kramer_212 10+ year member]

welcome to the less than perfect world we live in.