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The 2018 Nissan Altima offers five different audio setups to choose from. You can select a model with or without the premium Bose audio system, with or without navigation, and with either 4 or 6 speakers. Regardless of your choice, you can expect to have a center dash speaker, a corner dash tweeter, rear deck corner speakers measuring 6 inches by 9 inches, and rear door speakers measuring 6-3/4 inches. The size of the front door speakers depends on the specific audio configuration you choose. Fortunately, these speaker sizes are commonly available, making it easy to upgrade if desired. While the Bose audio system is high-quality and not recommended for replacement, the standard systems may not meet everyone's expectations in terms of performance.
The front doors of the 2018 Nissan Altima are equipped with 6.75-inch speakers.