The 2003 Chevy TrailBlazer has a couple of different speakers in it. In the front and rear doors, the car haS6-3/4" OHM speakers. In the back of the trunk and in the dash of the car has tweeter speakers. These are the speakers on the default trim of the vehicle. Larger speakers, as well as a more powerful amplifier were an option for some of the higher trim levels, but seeing as this is a nearly 20-year-old car it is likely better to buy newer speakers than to anything else. A new set of speakers would likely run You around 300 dollars, plus install if You don't take it to a shop to have them wire them.
Nathaniel M.
April 9, 2020
The 2003 chevy trailblazer speaker size for the front and rear door is 6-3/4".
Justin
October 20, 2022
So will a set of DD audio interior speakers work in all 4 doors Ijust ordered two pairs of DD audio replacement speakers for my 2003 Chevy trailblazer LT and I know the front doors are 6.5 but I thought maybe the rear doors were 5.25
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