My newly installed Kicker Comp C12 subwoofer sometimes makes a hugely loud, hugely annoying sound when I first turn the car on. It doesn't seem to stop, or get any softer when I turn down the volume to zero on the head unit. Usually I unplug the sub, and leave it for a while, then later it seems to be working perfectly again. I was wondering if it's the amp messing up or the subwoofer, and what I could do to make it NOT do that?
maybe you need to try a new location for your ground
check your grounds, and check your RCAs. One of the wires could be loose.
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Why is my Kicker subwoofer / amp making annoying noises?