Stock '03 speaker question, impedence

[elleonleo]

Hi,
I'm hoping to replace my stock liberty speakers. They are from the basic sound system, not the infinity premium kit. I'm not replacing the head unit.

1. Do I need to match impedences?

2. If so what impedence are these original speakers? Crutchfield says Jeep only uses 2ohm but I've heard on here that the base system is 4ohm.

3. Does anyone have any recommendations for good speaker replacements for the base sound system?

Thanks everyone!

 

[hardluck]

Hmm , ive never payed any attention to impedences , any 150 watt+ 3 way sounds good , but i always change my head unit ,


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[02redKJ]

Either 4 Ohm or 8 Ohm will work fine. 2 Ohm speakers are not nearly as common and therefore will be harder to find. In fact I have never seen any 2 Ohm speakers for sale anywhere before. Why are you changing the speaker? Did it blow? Or weather aging? Or ??? Do you plan on changing the head unit too? Are you changing a single speaker or a pair?

By the way... 2 4 Ohm speakers in parallel is 2 Ohm. 2 4 Ohm speakers in series is 8 Ohms.

 

[eradicator006]

I'm just going by memory here but I think the door speaker and the dash speaker are each 4 ohm wired in parallel for a 2 ohm load. I'm pretty sure this is how it was on my non-premium stock system.

 

[elleonleo]

thanks everyone.

so, I'm replacing speakers because 3 of them went bad all of a sudden. Fairly rare occurence I'm pretty sure but I narrowed down the problem and I know I need to replace them...SO i'm going to replace all 4 (and not the two front tweeters)

But, just to be clear: A 4 ohm speaker will be fine for BOTH front and back being powered by the original head unit?? Or perhaps do I need a 2 ohm speaker in the back and 4 ohm speakers in the front since it is getting wired in parallel with the tweeter?

Maybe I'm getting too hung up on the specifics but I just don't want to under or overpower whatever speakers I do get and this is my first time replacing speakers.

Thanks again everyone.

 

[02redKJ]

I would be more concerned about the wattage handling rating of the speaker than the Ohm value. Ohms measures impedance, otherwise known as resistance. A 2 Ohm load rated at 100 watts, is going to handle as much power as a 4 Ohm speaker rated at 100 Watts. If your head unit is rated at 50 Watts, both speaker examples will work just fine. I typically double the power output of the head unit and that is the speakers I install. IE 150W head unit/Amp, 300W speaker. Also remember that there is an RMS value as well as peak power value. RMS is Root-times- the Mean-Squared, or .707 times the peak. If the speaker is rated at 150W peak, its RMS will be 150*.707=106.5W RMS and the head unit is rated at 75W RMS, then you will need to take the 75W and multiply it by 1.414 to find the peak power which will be 75*1.414=106.5. That is what I double, because it is the peak power that usually will blow a speaker. In this example I would buy 200W speakers instead. Although a 150W speaker may work in this situation, I err on the side of caution. I hope some of my electronics engineering helped you some, and I hope I explained it in a way that is easy to understand. If you have more questions, please feel free to ask.

Bottom Line... I would not be too worried about the Ohm value as long as you have the wattage covered, you should be fine, and have a decent sounding stereo system. If you were going for the baddest and best sound you could get, you would not be keeping the head unit. I understand. I am keeping mine too. It sounds plenty good for my taste, and my days of Bass bumping have long past. LOL

Good Luck, and keep us posted on what you decide to do.

Edit: If you do need info on a higher end system, then let me know. I have done some pretty sweet systems in the past.

 

[elleonleo]

Thanks so much for the help.

How can I find out the output ratings of the stock amp? I took it out and searched the partnumber online but I could not find any specs. Any suggests? Or any actual speaker suggests you know work well?
Thanks