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  #13  
Old 05-25-2013, 01:02 PM
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Re: Factory Speaker Impedance

Any suggestions for me to try and help him? It just sucks that he bought a brand new 2013 and the sound is sub-par.
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  #14  
Old 05-25-2013, 01:05 PM
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Re: Factory Speaker Impedance

The only way to do it right is start checking connections. I would start at the subwoofer if that is the only issue that you both notice. Are you sure it has the sub back there? Can you actually see it when you look into the grille? Hell, maybe they forgot to put it in....I had that happen on a Titan pickup. The sub was never installed from the factory even though I had it optioned that way.
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  #15  
Old 05-25-2013, 01:13 PM
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Re: Factory Speaker Impedance

LMAO I hope it's there! But I guess we should really open it up and check.
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  #16  
Old 05-25-2013, 01:15 PM
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Re: Factory Speaker Impedance

I would, who knows. Like I said, I've seen it myself when it comes to a missing subwoofer .
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Old 05-25-2013, 01:26 PM
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Re: Factory Speaker Impedance

Quote:
Originally Posted by sswails View Post
Alpine System. I was messing around with my meter and decided to check the resistance value. Here is what I got.
Center speaker appears to be 2 ohm ( 2.1 )
Front 6x9's tested at 2 ohm (2.1 )
Front Tweeter tested at 6 ohm ( 6.1 )
Factory Sub tested at Dual 2 ohm ( 2.2 )
What you are measuring is the speakers resistance, not its impedance. They are not the same thing. A speakers impedance changes with frequency and cannot be measured by just connecting up a multimeter to the terminals and taking a reading.

As a rough and ready guide to get somewhere close to knowing the actual impedance from the measured resistance you need to multiply the result by 1.3. Even so, this is not really that accurate.

For a more concise description take a look at epanorama.net/Speaker impedance
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Old 05-25-2013, 01:29 PM
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Re: Factory Speaker Impedance

No, I understand it's DC resistance, but it still close enough that you can figure it out. DC Resistance is fairly close to the actual average impedance of the driver. You're correct about impedance changing through out the frequency. Just figured it was easier for most to understand.
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Old 05-25-2013, 02:51 PM
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Re: Factory Speaker Impedance

So in reality from your measurements all but the tweeter are nominally 4 ohm speakers. Compatible with 99.9% of replacement speakers.

Tweeters are often a higher impedance as the greater value works as an attenuator and allows the tweeter to cope with a much higher input power than is actually needed. Typically an average tweeter with an actual 4 ohm impedance would only need a tenth of the power that an average bass speaker does (yes, I know that efficiency can also have a large bearing on this). By making them a higher impedance it does away with the need for a proper crossover.
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Old 05-25-2013, 03:02 PM
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Re: Factory Speaker Impedance

So are we saying the door speakers are 4 ohm?
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Old 05-25-2013, 03:07 PM
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Re: Factory Speaker Impedance

Yep, pretty much as close to a nominal 4 ohms as any car speaker that is rated at 4 ohms is.
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  #22  
Old 05-25-2013, 03:26 PM
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Re: Factory Speaker Impedance

No, they are 2ohm as most factory speakers tend to be. I comparison, the speakers I currently have lying around measure in the mid 3's to 4. Trust me, they are 2ohm.
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Old 05-25-2013, 03:28 PM
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Re: Factory Speaker Impedance

Heck, the door speaker bounce between 1.7 to 2.1.
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Old 05-25-2013, 03:32 PM
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Re: Factory Speaker Impedance

I'm having trouble understanding that statement. Your own measurements show the DC resistance to be 2.1 ohms, the rough guide multiplication factor converts this to 2.73 ohms (which is only a rough guide but still well above 2 ohms) so I have no doubt at all that if the impedance was measured properly at the standard 400Hz the true value would be far closer to 4 ohms than it would be to 2 ohms.
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