if a coil read 3.0 is it a 2 or 4 ohms

[bonesninja 5,000+ posts]

forget about it

 

[bonesninja 5,000+ posts]

bonesninja , alxmlr789 , Anonymous User , btdickey99 , dadydolas , dillinja666 , Etac , jmanpc , luvinthebass , morgans432 , NDMstang65 , rollerdj , shortyg83

party is over guys...go do something productive

 

[shortyg83 10+ year member]

I would say it is dual 4 ohm. Most subs I have that are dual 2 ohms normally read 1.5 or around there. So 2.9 per coil would be closer to a 4 ohm coil

 

[bonesninja 5,000+ posts]

heres the answer i guess i was looking for

quoted from squeak

"You are measuring something other than the nominal impedance, as lilmaniac pointed out.

What you are measuring with your DMM is called the Re (or DCR, the terms are essentially interchangeable). The Re (DCR) is the "Direct Current Resistance" of the voice coil. The DCR is relatively static and is, simply put, the resistance of the coil at rest.

The rated nominal impedance is a different beast. Impedance is the opposition to the flow of alternating current and will vary based on things such as the frequency of the signal the speaker is playing. The "rated" nominal impedance of a speaker is basically an average of what load the speaker will present to the amplifier over it's intended operating range. So while it may be "rated" for an nominal impedance of 4ohm, depending on frequency the actual load presented to the amplifier may be higher (or slightly lower) than 4ohm.....and at the speaker's resonant frequency (Fs) the load could be significantly higher than the rated nominal impedance......30ohm or more depending on the speaker. Impedance also increases as frequency increases due to factors such as inductance.

Most 4ohm speakers will have a DCR in the range of 3.0 - 3.8ohm"

 

[luvinthebass 5,000+ posts]

squeak here is the car audio God for info, it's amazing

 

[bonesninja 5,000+ posts]

yeah but he knows shit about women

 

[luvinthebass 5,000+ posts]

Currently Active Users Viewing This Thread: 13 (11 members and 2 guests)

luvinthebass , 22mountaineer , Anonymous User , btdickey99 , dadydolas , dillinja666 , Etac , rollerdj , RyanM923 , shortyg83 , XaznKewLguyX

party is over fellas

 

[dadydolas 10+ year member]

bonesninja , alxmlr789 , Anonymous User , btdickey99 , dadydolas , dillinja666 , Etac , jmanpc , luvinthebass , morgans432 , NDMstang65 , rollerdj , shortyg83


party is over guys...go do something productive

i actually enjoy the info more than the arguements

thanks

besides its christmas where is the holiday spirit?

 

[RAM_Designs 5,000+ posts]

You've been installing systems for 21 years, yet you didn't know that it was a 4ohm coil?

noob.

 

[bonesninja 5,000+ posts]

You've been installing systems for 21 years, yet you didn't know that it was a 4ohm coil?
noob.

yup...i'm a noob

 

[luvinthebass 5,000+ posts]

maybe a noob at figuring out resistance

round 2

 

[Haunz 10+ year member]

21 years installing and 8000+ posts on this site and STILL dosen't have a clue..... but is more then ready to chew out luvthebass ??

are you a complete retArd or out of your 8000+ posts did you actually post something useful? i've been doing this for A LOT longer than you have and i know all about amps, subs, ohms etc. what i asked has nothing to do with the amplifier. I wanted to know if 2.9 on a coil is considered 4 ohm or 2ohms

In reality the nominal impedance of the coil is going to be pretty close to it's DCR.... the reason the coil reads 2.9ohms at rest but is considered a 4ohm coil is because of a little thing called power compression....

At a working temperature both the nominal impedance and the DCR will be alot closer to 4ohms.... //content.invisioncic.com/y282845/emoticons/wink.gif.608e3ea05f1a9f98611af0861652f8fb.gif

 

[bonesninja 5,000+ posts]

i'm not an installer if that helps you feel better....and i do have a clue, and i chewed him out for posting something that is unrelated to the original question. I never claimed to know it all...just alot. but like i said, i'm not an installer, just a fanboy of car audio

 

[bonesninja 5,000+ posts]

21 years installing and 8000+ posts on this site and STILL dosen't have a clue..... but is more then ready to chew out luvthebass ??





In reality the nominal impedance of the coil is going to be pretty close to it's DCR.... the reason the coil reads 2.9ohms at rest but is considered a 4ohm coil is because of a little thing called power compression....

At a working temperature both the nominal impedance and the DCR will be alot closer to 4ohms.... //content.invisioncic.com/y282845/emoticons/wink.gif.608e3ea05f1a9f98611af0861652f8fb.gif

and i don't really need to know all of that in order to install things. most mainstream stuff...which is all anyone ever brings to me, is usually labelled so i just go what is on the labels as far as nom. imp. goes

 

[Immacomputer 10+ year member]

In reality the nominal impedance of the coil is going to be pretty close to it's DCR.... the reason the coil reads 2.9ohms at rest but is considered a 4ohm coil is because of a little thing called power compression....
At a working temperature both the nominal impedance and the DCR will be alot closer to 4ohms.... //content.invisioncic.com/y282845/emoticons/wink.gif.608e3ea05f1a9f98611af0861652f8fb.gif

That's not true at all and it will vary over frequency. Also, power compression is a very small factor for impedance rise.