2nd Gen Non-Engine/Transmission Stock infinity speakers - ohm rating?

[KLockliear]

Just wondering if these happen to be 4 ohm... where I could replace them without changing the deck yet.

 

[Wiredawg]

Check w/ Crutchfield

Keith:



Check w/ Crutchfield, they always seem to know the answer. A friend used the cheap ones from WalMart in the plastic bubble packaging. Worked great.



Wiredawg

 

[rblomquist]

Keith,



When I bought my truck I found out the right speaker was bad. I replaced it with a Sony from Wal-mart and it's been working great for almost 2 years now. I still have the other Sony speaker to use in case the left side infinity craps out.



You should be able to drop a typical off-the-shelf speaker in and be good to hook... ...









***Guess the Air Force Guys are taking care of Keith on this one***

 

[Cooker]

Yes, they can be replaced without changing the deck. The decks are the same between the Infinity and Non-Infinity equipped trucks. One problem you may run into is powering the OEM tweeters. You will need to figure out the wiring if you do not retain the OEM amplifier on the Infinty speakers. It is not all that difficult as I have done it before, just a little time consuming.

 

[RBratby]

if you take a fluke meter to it put it on ohm it will give you the resistance. then you will know. just my 2 cents

 

[ronco]

Originally posted by RBratby

if you take a fluke meter to it put it on ohm it will give you the resistance. then you will know. just my 2 cents

RBratby, speakers are rated at impedance, not necessarily resistance (ohms). The difference between resistance and impedance is impedeance is frequency derived. A speakers impedance changes with it's input frequency. I don't think you can measure impedance with an ohm meter. HTH





Ronco

 

[John - K5AWO]

Well, to get really technical, an ohm meter does read 'impedance', it just the ohmic value of direct current flow.



Although in the electronics world, impedance nearly always refers to the resistance of a device to the flow of an alternating current.



In the case of the speaker, its' impedance should rise with increasing frequency. The manufacturer should state at what frequency the value was derived at.



Normally, it would be at 1000 cycles as that is the mid-range of normal hearing and intelligibilty. ( 300-3000 cycles )



Yeah, I know, you young f#@ts still hear things over 20,000 cycles

 

[E7mack96]

with an ohm meter, an 8 ohm usually reads near 6 and a 4 ohm will read about 3.



Most auto audio uses 4 ohm and most home audio uses 8 ohm.

 

[RBratby]

an 8 ohm speaker will read 8 ohms not 6 ohms. the reason being is there are 6 ohm speakers i have them on my home audio system. speakers are read in impediance but a voice coil is read in ohms. that is what the question was about what is the ohm rating of oem speakers so they could be replaced.

 

[lil red cummins]

i love the technical discussion, but that was not keiths' question.



basically keith, as long as the replacement speaker you use is the same ohm rating or HIGHER, you should have no problem.



you normally only have a problem when the resistance goes too low. this could happen if you took 2 speakers and connected them in parallel.



too low a resistance will look more like a "short circuit" to some amplifiers. most these days however have protection circuits to avoid amplifier damage.



jim

 

[Rman]

Originally posted by RBratby

an 8 ohm speaker will read 8 ohms not 6 ohms. the reason being is there are 6 ohm speakers i have them on my home audio system. speakers are read in impediance but a voice coil is read in ohms. that is what the question was about what is the ohm rating of oem speakers so they could be replaced.

man that's way off the mark. I'll prepare a little of a response later, I have to go right now.

 

[KLockliear]

Originally posted by lil red cummins

basically keith, as long as the replacement speaker you use is the same ohm rating or HIGHER, you should have no problem.

jim

Thanks Jim. The question was, does anyone know what it is? I know how to measure it... I just don't want to pull the door panels and speakers to find out.

 

[Rman]

It's 4 ohm's keith.

 

[Rman]

for those that care here's the scoop on impedance and resistance.



All speakers have impedance that varies by frequency. Resistance as most everyone knows is the nature of an object to resist current flow. IMPEDANCE however, is a bit different, it is dependent on reactance and frequency... in fact impedance generally only occurs in AC circuits, I say generally because fluctuating DC circuits also have it, (AC circuits with DC bias).



A coil increases resistance as the frequency gets higher, where a capacitor is opposite and increases resitance as the frequency gets lower. This reactance is neccessary for crossovers to function. Crossover's work by combining the both coils and capactors to block frequencies from going to tweeters or woofers depending on the respective frequency.



OK, so the big speaker issue with "resistance". Manufacterers rate these speakers at an OHM value, and is achieved by placing a DC current across the voice coil, this inturn gives a "resistance" of 4, 6, 8 ohms etc... This coil almost never operates at that impedance... I say impedance because when an ac signal is applied "resistance" becomes impedance. When it is, it's called at resonance... a whole othe rball of yarn to talk about. The voice coils impedance is constantly fluctuating because the frequency constantly changes. The dc resistance of a 4 ohm speaker will vary depending on a ton of things, but generally it's somewhat close. 3. 2 vice 4 Ohms or something like that, heat, and circuit content, heck uncalibrated equipment can cause variances. 4 ohms is not a lot of resistance.



Anyway fellas there you have my lesson. 4 ohm's are common in vehicles, 8 in homes, although 6 is gaining popularity.