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In August 2000, the ninth-generation Corolla was introduced in Japan, with edgier styling and more technology to bring the nameplate into the 21st century.

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Hooked up a 4 ohm speaker in the 6 ohm rear speaker receiver.

I recently bought after market speakers, they are 4 ohm Speakers. The Toyota Corolla 07 I am driving has 6 ohm capability to the rear speakers. When my car is idling the speakers draw to much power and it's revolutions are half as much as they should be down to about 500. Would putting an amplifier that had 2 or 4 ohm capability help? Or would that just make things worse?

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I'm not sure how putting speakers in to a car would cause the problems you are describing. It is possible that the problem existed before but you're just noticing it now due to the changes you made. Cars idle around the 800rpm mark, and if an auto, and in drive will idle around 500rpm.

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Hi @vulkus ,

For my info would extra load on the alternator slow the motor at idle?

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It shouldn't do, I used to run a set of 100 w spotlights directly off my battery when I was young and stupid.... And that was an old Fiat 128 '70's model and that never caused the revs to lower. This Corolla has probably an 80 amp alternator which should be enough to handle most things on the car. I am going to assume that the problem lays in the amplifier and not the speakers. From what I've just read and I'm far from up in the electronics field. But if the car is rated to 6 ohm's then you can use 6 or higher but never lower, as it causes to much power back to the amp and thus causes damage.

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Hi @vulkus

Cheers,

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