The Oldsmobile Regency rear deck lid accommodates a 4x10 inch speaker size across all listed model years. Compatible types for the location include full-range audio units. These specifications cover the 1997 to 1998 system range.
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 deck lid is the installation location across both listed model years, a position typically characterized by a flat, horizontal surface spanning the width of the vehicle's trunk area, sitting beneath the rear window.
Mounting in a rear deck lid orients speakers to fire sound upward toward the rear window glass and into the cabin, a placement that naturally reflects and diffuses audio toward front and rear passengers.
The 4x10 inch dimensions describe a rectangular speaker footprint, a format historically associated with domestic American full-size sedans, where the elongated shape fits the shallow but wide cavities common in rear deck structures of that era.
A 4x10 inch speaker's rectangular cone area distributes low-to-mid frequency reproduction across a wider surface than a circular cone of similar diameter, which affects how sound pressure develops within the deck cavity.
The 4x10 inch format occupies a relatively large mounting area, which means the deck lid must accommodate a correspondingly wide cutout and sufficient depth clearance for the speaker basket and magnet assembly beneath the surface.
Full-range drivers are designed to reproduce the entire audible frequency spectrum-from low bass through midrange to high treble-within a single speaker unit, without requiring a crossover network to divide frequencies among separate drivers.
In a rear deck lid position, a full-range driver handles all frequencies at that location independently, meaning no separate tweeter or woofer is specified alongside the Oldsmobile Regency's listed rear deck lid speaker for the 1997 and 1998 model years.
The rear deck lid location places speakers at approximately ear level or slightly above for rear-seat passengers, which affects the perceived tonal balance and stereo imaging experienced in that seating position.
Full-range compatibility in a 4x10 inch driver for a rear deck application means the speaker must manage low-frequency excursion as well as high-frequency cone rigidity, both of which are influenced by the physical constraints of the elongated cone geometry.