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Bavarian Soundwerks' Mobile Electronics Forum
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Old 01-01-2011, 11:26 PM   #1
shadow330
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speaker impedance question

This question is actually for my chevy tahoe, I need someone who understands speakers to help me out. I recently installed Infinity 6030cs component speakers in my front doors with a new Kenwood 994 head unit. Now I am looking to upgrade my rear sub to a deacent 10", install rear door speakers and an amplifier. My question is, since my new front door speakers are 2 ohm, do the rest of my speakers have to be 2 ohm, I have not purchased my 5 channel amp yet. I hope someone is willing to help out with something other than an e46 question.
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Old 01-01-2011, 11:30 PM   #2
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The rears don't HAVE to be 2 ohm. It would be optimal if they were. I believe Infiniti is the only company to make 2 ohm door speakers. The fronts will just be louder than the rears because they will be getting roughly twice the power that the rears will be recieving. Hope that makes sense. It can definitely be done.
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Old 01-01-2011, 11:33 PM   #3
shadow330
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Thanks, that does help, the rear doors are not that important to me since there is usually nobody in the back, just didnt want a lack of sound completely, how about my sub?
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Old 01-01-2011, 11:39 PM   #4
E46_330i_Stud
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I didn't even have rear speakers in my previous car. They are basically for fill anyways unless your riding in the back. The sub can be 2 or 4. The sub channel should be class D while the other 4 are probably class A/B. Meaning it's like having a 4 channel full range amp and a mono subwoofer amp built into the same chassis for convenience. I personally would go for a 2 ohm sub as well just to get the most potential and power from the amp and setup. You can always adjust the sub gain if it's to much.
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Old 01-02-2011, 12:04 AM   #5
shadow330
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Thanks for all your help, I really appreciate it.
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Old 01-02-2011, 12:19 AM   #6
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Don't mention it. PM me if you hit any issues with install or just have questions. Im decently knowledgeable in the car audio area.
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Old 01-03-2011, 01:08 AM   #7
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i really can't top the advice that was already given..
2 ohm front and 4 ohm rear fill sounds like a good idea.. i always put the fader in a car to the front.. even if you do have passengers, having the rear speakers as loud as the front just makes the people in the back not able to hear anything.

but let's look into this subwoofer question.. you have a 330ci? what are you thinking? just throwing a box with a 10" in the trunk? or something more integrated?
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Old 01-03-2011, 12:06 PM   #8
shadow330
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No, this is actually for my tahoe, my 330ci is next for a sound system, and I dont think I want anything as heavy as a 10" in my 330, Im not lookin for a whole lot of bass in either, just something to sound better than factory, I was thinking about 8" in the tahoe, and possible the same in the 330 if I can find a place to put it, if I can have a box made that looks right for the car I would probably be willing to go that route.
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Old 01-04-2011, 03:20 AM   #9
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Lest you foregt, a 3dB difference in sensitivity between the fronts and rears will make those speakers twice as loud, overcoming any impedance differences. Basically you are going to have to EQ the whole lot to get it flat anways, after the speakers have run in. Of course be carefull with 2Ohm (nominal) load speakers on your amp. It doesn't take much for that to drop to 1 Ohm for brief periods, which is basically a short across your amp outputs, making it get pretty damn hot. Amp must be 2 Ohm stable.
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