The Mazda CX-9 rear door panel accommodates a 6x8 inch speaker size in the listed location. Full-range units are the compatible type for the audio system. The specifications cover the years 2007 to 2017.
A single driver that reproduces bass through treble without a separate crossover network. It is the simplest replacement option and is common in factory audio systems.
Additional Notes
The rear door panel location in the Mazda CX-9 positions speakers within the lower portion of the rear passenger doors, placing the drivers at seat level relative to rear occupants.
Door panel mounting integrates speakers into a cavity within the door structure, which affects low-frequency loading and the acoustic boundary conditions around the cone.
The 6x8 inch oval format is used across all listed model years of the Mazda CX-9 rear door panel, meaning the mounting cutout dimensions remain consistent throughout the 2007-2017 production span covered by the specifications.
A 6x8 inch oval driver has a cone surface area that approaches or exceeds that of a standard 6.5 inch round speaker, giving the format greater low-frequency displacement capability than its shorter axis alone would suggest.
The elongated oval shape of a 6x8 inch driver allows fitment in door cavities where vertical space is sufficient but horizontal depth is restricted, a geometry common in automotive door panel designs.
The rear door panel location places the 6x8 inch drivers at a lateral angle relative to rear passengers, directing cone output toward the cabin interior rather than at the floor or ceiling.
Full-range is the sole compatible type listed for the Mazda CX-9 rear door panel, designating drivers engineered to reproduce low, mid, and high frequencies from a single cone-and-tweeter assembly or a single treated cone without a dedicated crossover network.
A full-range driver in a rear door location handles the entire audible spectrum for rear-seat sound reproduction without requiring additional satellite tweeters or subwoofers at the same mounting position.
The 6x8 inch cone area supports bass and lower-midrange reproduction, which in a door panel location reinforces the low-frequency content perceived by rear passengers seated in close proximity to the driver.
Full-range drivers span roughly 50 Hz to 20 kHz in operational terms, though cone mass and suspension in the 6x8 inch format typically produce a response weighted toward the lower portion of that range.
The door panel cavity acts as an enclosure for the rear face of the cone, and the volume and sealing quality of that cavity influence the bass extension and midrange coloration of the 6x8 inch full-range driver installed within.