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Old August 3rd, 2007, 09:15 PM   #1
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Question about Impedances

Ok, so I have a really old rockford fosgate p4004 which was repaired at the factory and sent back to me.

It's rated at:
100W x 4 @ 2 ohm min OR
50w x 4 @ 4 ohm


My rear speakers are 4 ohm, and my fronts are 2 ohm. What effect does this have on the power/sound output (can the impedances be mixed?), and is there any kind of consequence to the amp? My amp originally died on me and I had no clue why, maybe this was the reason?
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Old August 3rd, 2007, 10:14 PM   #2
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Quote:
Originally Posted by OUTATIME
Ok, so I have a really old rockford fosgate p4004 which was repaired at the factory and sent back to me.

It's rated at:
100W x 4 @ 2 ohm min OR
50w x 4 @ 4 ohm


My rear speakers are 4 ohm, and my fronts are 2 ohm. What effect does this have on the power/sound output (can the impedances be mixed?), and is there any kind of consequence to the amp? My amp originally died on me and I had no clue why, maybe this was the reason?
There shouldn't be any effect on the amp as long as it's not below 2 ohms stereo on all 4 channels.

What could affect the amp is that you have a short on your wiring or a blown speaker that will fall below the 2 ohm impedance stability.

Get access to a digital multimeter and do either a.) resistance test with ohms or b.) continuity test to see if your speakers are grounding out. This is a for sure troubleshooting test to prevent amp failure.
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Old August 4th, 2007, 08:32 AM   #3
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Does it have any kind of adverse effect on sound output? Will the fronts be louder than the rear or something since there's less resistance?

I feel like an idiot, im a computer engineering major, i should know this.
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Old August 5th, 2007, 11:36 PM   #4
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Does it have any kind of adverse effect on sound output? Will the fronts be louder than the rear or something since there's less resistance?

I feel like an idiot, im a computer engineering major, i should know this.
Yes, there is no good way to do what you want to do. The 2 ohm speakers would get twice the power of the 4 ohm speakers. And its not like your starting off with alot of power anyways....

Uhhhh... Your best bet would be to get two seperate two channel amps, or if the amp has individual gain controls for each channel, that would work too.. Just drop the louder speakers down to about half power, and the quiet ones at full...

But dam, 50w a channel? im running a little over 100w into my stock speakers, and sometimes its not enough...

Last edited by ericspda; August 5th, 2007 at 11:40 PM..
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Old August 6th, 2007, 07:32 AM   #5
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Yes, there is no good way to do what you want to do. The 2 ohm speakers would get twice the power of the 4 ohm speakers. And its not like your starting off with alot of power anyways....

Uhhhh... Your best bet would be to get two seperate two channel amps, or if the amp has individual gain controls for each channel, that would work too.. Just drop the louder speakers down to about half power, and the quiet ones at full...

But dam, 50w a channel? im running a little over 100w into my stock speakers, and sometimes its not enough...
Well, yes, there is a gain for the front and rear so I could do that. And I'm not really into loads of power, I just want a decent amount of power over an aftermarket HU, hopefully this will do the job. Unfortunately when I bought the speakers I only looked at wattage and didn't think too much about impedances assuming all infinity kappa speakers should have the same impedances.
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Old August 6th, 2007, 09:11 PM   #6
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^ then go for it man, should work alright
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