GMC C/K Series Pickup Rear Door Panel Speaker Size
The GMC C/K Series Pickup rear door panel accommodates a 6.5 inch speaker size across all listed model years. Compatible speaker types for the location include midbass and full-range units. The specifications cover a range of years from 1990 to 1999.
| Year | Type | Size (inch) |
|---|---|---|
| 1999 | Midbass / Full-Range | 6.5 |
| 1998 | Midbass / Full-Range | 6.5 |
| 1997 | Midbass / Full-Range | 6.5 |
| 1996 | Midbass / Full-Range | 6.5 |
| 1995 | Midbass / Full-Range | 6.5 |
| 1994 | Midbass / Full-Range | 6.5 |
| 1993 | Midbass / Full-Range | 6.5 |
| 1992 | Midbass / Full-Range | 6.5 |
| 1991 | Midbass / Full-Range | 6.5 |
| 1990 | 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 GMC C/K Series Pickup positions speakers within the lower section of the door structure, placing the acoustic output source at approximately seat-level height relative to occupants in the rear seating area.
- Door panel mounting situates speakers within an enclosed cavity, where the door's internal sheet metal acts as a rear boundary that influences bass loading and low-frequency output efficiency.
- A 6.5 inch driver diameter represents a mid-sized woofer cone area large enough to move sufficient air for meaningful low-frequency reproduction while still fitting within the spatial constraints of a door panel cutout.
- The 6.5 inch cone diameter in a door panel location allows the driver to produce frequencies from the upper bass range through the midrange, typically spanning roughly 60 Hz to 5 kHz depending on driver construction.
- At door panel height, a 6.5 inch speaker radiates sound upward and inward toward the cabin, with the door's angle and surface geometry affecting the dispersion pattern reaching rear-seat occupants.
- The midbass type, as listed for the GMC C/K Series Pickup rear door panel, is a driver designed to reproduce the lower portion of the midrange and upper bass frequencies, generally operating between approximately 80 Hz and 500 Hz without extending into treble reproduction.
- A midbass driver in a door panel location reinforces the low-frequency body and warmth of the audio signal reaching rear passengers, with the door cavity providing additional acoustic volume that supports bass extension.
- The full-range type listed for the rear door panel is a single driver designed to cover a wide frequency band, from bass through treble, without requiring a separate tweeter to reproduce high-frequency content.
- A full-range driver in the rear door panel of the C/K Series Pickup allows a single speaker to handle the entire audible spectrum at that location, with cone geometry and whizzer cone designs typically used to extend high-frequency dispersion.
- The door panel mounting depth and cutout diameter must accommodate the speaker's basket dimensions and magnet clearance, with 6.5 inch referring to the nominal cone diameter rather than the total basket outer diameter.