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In a 2000 Chevrolet Blazer, the factory-installed speakers are 6-¾ inches in the front and rear doors. Additionally, there are 1-inch tweeters in the A pillars as part of the front stage setup. To switch out the stock speakers, you'll have to take off the door panels to access them. While the 6-¾" size is commonly found in stock systems, most aftermarket manufacturers only make 6.5-inch woofers. To work around this, you can either look for a stock replacement speaker or use an adapter to fit the smaller speaker in the larger factory hole. Adapters are simple to use and affordable, making them the preferred option for most people when upgrading.
The Chevy Blazer 2000 has 4x6" speakers with 2 ohms for the corner dash, 6-3/4" speakers with 2 ohms for the front door, and 6-1/2" speakers for the rear door.
The back doors measure 5.25 inches, the front doors are 6.5 inches, and the dashboard accommodates a 4x6-inch speaker.
In a 2000 Blazer LS, the dashboard speakers are sized at 4x6 inches, the door speakers at 6.5 inches, and there are 6x9-inch speakers located behind the seats on the sides.