Mitsubishi Galant Rear Deck Lid Speaker Size

Additional Notes

• The rear deck lid is a horizontal mounting surface positioned along the shelf behind the rear seats, beneath the rear window, placing speakers in a rearward-facing or upward-facing orientation that projects sound into the cabin from behind the occupants.
• Mounting locations on a rear deck lid are typically flush or semi-recessed into the panel surface, meaning available depth clearance and cutout diameter are critical factors for speaker fitment in addition to the nominal speaker diameter.
• The 6x9 inch size is an oval format, with its elongated cone providing a larger radiating surface area than most round speakers in the same class, which supports stronger low-midrange output and greater cone excursion for bass reinforcement from the rear deck position.
• Full-range speakers, as the sole compatible type listed for 6x9 inch fitments in the Mitsubishi Galant rear deck, are designed to reproduce the full audible frequency spectrum from a single driver, covering low-midrange through high frequencies without requiring additional tweeters or crossovers in the same location.
• The 6.75 inch round size has a slightly smaller radiating area than the 6x9 oval format, but retains sufficient cone surface to handle midbass and midrange frequencies effectively, making rear deck placement acoustically suitable for filling the cabin with mid-frequency content.
• Midbass speakers, listed as a compatible type for the 6.75 inch and 6.5 inch sizes in the Mitsubishi Galant rear deck lid, are optimized for the frequency range roughly between 80 Hz and 500 Hz, focusing on the lower midrange and upper bass frequencies rather than the full spectrum.
• When a midbass driver occupies the rear deck, high-frequency reproduction at that location depends on supplemental tweeters mounted elsewhere in the vehicle, as midbass drivers roll off significantly in the upper frequency ranges.
• The 6.5 inch round size, listed for the 1989-1993 model years, is one of the most common round speaker formats and is acoustically well-suited to midrange and midbass duties from a rear deck location, where the enclosure formed by the trunk cavity behind the panel can influence low-frequency loading.
• The 5.25 inch size listed for the 1988 model year has a smaller cone area relative to the 6.5 inch and 6.75 inch sizes, which generally results in a higher low-frequency rolloff point, making rear deck bass reinforcement more limited at that size compared to the larger formats found in later model years.
• The rear deck lid location places speakers at a distance from the front occupants, which acoustically introduces a time-delay differential relative to front-mounted speakers, a factor relevant when integrating rear deck drivers into a multi-speaker system.
• The horizontal orientation of rear deck speakers directs sound upward toward the headliner before it reflects into the cabin, which affects the perceived soundstage and stereo imaging compared to door-mounted speaker positions.
• The Mitsubishi Galant rear deck lid accommodates 2 distinct opening sizes across the model range - the oval 6x9 inch cutout and the round formats - meaning the mounting template and cutout geometry differ between model years using different sizes.