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All versions of the 2002 Chevrolet Avalanche come with the same speaker setup: 6-3/4 inch speakers in the front and rear doors. This setup is common and easy to upgrade if desired. While the speakers and head unit were good back then, after nearly two decades, they may show signs of age. If you're thinking of upgrading the head unit, you can choose from various options from brands like Boss, Sony, JVC, Pioneer, Alpine, Kenwood, and others for around $100 or a bit more with features like auxiliary input and Bluetooth. Consider adding new speakers too; the upgrade should only take you a short afternoon.
in the 2002 Avalanche, the length is actually 6.5 inches.
In the front and rear doors of a 2002 Chevy Avalanche, you'll find 6.75-inch speakers.
6.5-inch speakers. Identical to the ones used in the Silverado.