The original stock speakers are of poor quality.  It is highly recommended to replace them with aftermarket speakers, as you will surely end up with better sound!  With the age of the vehicles, the original speakers will typically have crumbling foam surrounds.  The crumbling foam will cause the speaker to produce very bad noises.  The original stock speakers are 4Ω - this is the standard impedence of most aftermarket car audio speakers, so replacements are easy to find.

Like the speakers, the rest of the stock, original stereo electronics is poor.  It is recommended to replace the stereo headunit, and bypass (or replace) the stock original amplifiers.

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