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The 2003 Chevy TrailBlazer comes with different speakers installed. There are 6-3/4" OHM speakers in the front and rear doors, as well as tweeter speakers in the back of the trunk and the dash. These are the standard speakers that come with the vehicle. Some higher trim levels offered larger speakers and a more powerful amplifier as optional upgrades. However, since this car is almost 20 years old, it might be better to invest in newer speakers rather than other upgrades. A new set of speakers would cost around $300, plus installation unless you prefer to wire them yourself.
The speaker size for the front and rear doors of a 2003 Chevy Trailblazer is 6.75 inches.
Will the DD audio interior speaker set fit in all four doors? I just bought two pairs of DD audio replacement speakers for my 2003 Chevy Trailblazer LT. I know the front doors are 6.5 inches, but I'm unsure if the rear doors are 5.25 inches.