Ok, about a month and a half ago i installed all new speakers in my car. I had the stock head unit in , every thing was working great, tehy sounded awsome. Then i installed a used sony head unit. well about a week ago my front drivers side speaker went out. well i listened to all the speaker seperately and it turns out that it didnt go out, the wofer of the speaker stopped. The tweeter was still going putting out highs but the woofer stopped. Since it first hapened, it keeps going in and out. When it IS playing, ceartain freqencies hit at medium levels and there is a kind of knocking/ popping sound. Its very annoying and I'd REALLY like for it to stop. today i even took the speker out to see if it was blown, then I tried my old stock speaker, just to see if it was the head unit, and it was only the speaker that had the problem. Whats wrong? I can not think of anything else, my passenger side front GXR6 works flawlessly and they have the same power load. I do not have the slightest idea whats wrong.