Most factory stereos or even high-end systems protect speakers by reducing their sub harmonic output when cracking the volume on high. If you’re looking to get past this bottle neck in your system then you’ll want to install a Bass Enhancer then adds more bass at high volume levels while keeping your bass response balanced at low volume.
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Founded in 1999, the OnlineCarStereo.com team has worked to put together one of the largest selections of car audio/stereo in this country.