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My left channel cuts in and out (not completely on and off, but less than half the volume of the right.) I notice it mainly when excelerating hard or hitting bumps mid corner. It used to be every now and then, but now much more often. It is very annoying to have the speakers closest to my ears cutting in and out where they can hardly be heard. I had a car stereo dealer install a speaker to line level converter to the factory head unit (to run a sub), so I'm wondering if that's the problem. If any of you have had similar problems I'd really like to know.
 

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I know this is a long shot. I've been searching this site for this problem and a solution. My 2001 IS 300 with stock stereo is doing exactly this.
But no-one replied to this for 4 years so what hope is there of someone helping diagnose it? We'll see.
Bizarrely is only does it when playing CDs, the radio works fine through both channels.

Any help musch appreciated.
 

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well i always hear that the stock radio is a pile so the best thing to do is if the car is still under waranty is get it replaced free if not then just buy a cheapo headunit somewhere or good if u got the money and have it installed
 

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If the problem only occurs under some sort of acceleration (lateral, forward, etc) the problem is likely connection related. Double check all the wire connections (especially the LLC). Tug on the wires a bit (not too hard) to make sure they are securely connected. That's about all the help I can try to give.
 

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i had a similar problem with my passenger tweeter. It would screech the most horrible sounds randomly once in a while, even fi the car was off and the keys out of the ignition. The main problem was that every time I took it into the dealer, it started acting normal again (of course!). Eventually I got it in and made the valet reception guys cover their ears in pain from the noise. Turned out to be a short, they replaced it immediately.

Moral of the story: take it in to the dealer to get looked at, hopefully its covered under warranty
 
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