Pontiac GTO Rear Door Panel Speaker Size
The Pontiac GTO rear door panel accommodates a 6.5 inch speaker size across all listed model years. Compatible types for the location include midbass and full-range units. The specifications cover the years 2005 to 2006.
| Year | Type | Size (inch) |
|---|---|---|
| 2006 | Midbass / Full-Range | 6.5 |
| 2005 | Midbass / Full-Range | 6.5 |
Speaker Types
| Type | Description |
|---|---|
| Midbass | A driver tuned for upper bass and lower midrange, roughly from 80 Hz to 500 Hz. It has longer cone travel than a full-range unit, which supports stronger bass in doors and panels. |
| Full-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 door panel location in the Pontiac GTO positions speakers within the door cavity, where the speaker fires into the cabin from a low lateral angle, placing the driver closer to the listener's ear level than a dash or rear deck installation would.
- Door panel cavities introduce acoustic reflections from the door's internal structure, which can color the sound and affect imaging depending on speaker mounting depth and baffle surface.
- A 6.5 inch driver in a door panel installation occupies a mid-sized footprint that balances cone surface area for lower-frequency output with the physical constraints of the door cavity's depth and diameter clearances.
- The 6.5 inch cone diameter produces enough radiating surface to move air efficiently in the lower midrange and upper bass frequencies, which are the frequency ranges most relevant to a door-mounted position.
- The Pontiac GTO rear door panel's structural depth and mounting ring diameter must accommodate a 6.5 inch speaker's basket width and mounting depth, both of which vary by manufacturer and must be verified against the door's available clearance.
- A midbass driver in the rear door panel location is tuned to reproduce lower midrange and bass frequencies, typically from approximately 80 Hz to 500 Hz, contributing body and warmth to the overall soundstage from the rear of the cabin.
- A full-range driver in the rear door panel location reproduces a wider frequency spectrum, generally from around 60 Hz to 20 kHz, allowing a single driver to handle both low and high frequencies without a dedicated tweeter in the same location.
- The rear door panel position, as opposed to a front door or dash location, places the speaker farther from the primary listening position, which affects the time-arrival characteristics of sound reaching front-seat occupants.
- Both the 2005 and 2006 model years of the Pontiac GTO share identical rear door panel speaker size and type compatibility, indicating no change in the door panel's physical mounting cavity between those 2 model years.
- A 6.5 inch midbass driver in the rear door panel is typically crossed over with a high-pass filter to prevent overexcursion from very low bass frequencies that the cone and suspension may not be mechanically suited to reproduce at that mounting location.