BMW 328is Rear Door Panel Speaker Size
The BMW 328is rear door panel accommodates a 4 inch speaker size. Midrange units are the compatible audio types for the rear door panel location. These specifications cover the 1996 model year.
| Year | Type | Size (inch) |
|---|---|---|
| 1996 | Midrange | 4 |
Speaker Types
| Type | Description |
|---|---|
| Midrange | A driver for the middle of the audible range, typically from about 300 Hz to 5,000 Hz, where vocals and most instruments sit. It is often paired with a tweeter and a woofer. |
Additional Notes
- The rear door panel location in the 1996 BMW 328is accommodates a 4-inch speaker opening, a relatively compact mounting cavity characteristic of door panel installations where spatial constraints are defined by the inner door structure and trim panel depth.
- Door panel speaker positions are typically recessed within a molded cavity, meaning the mounting depth and baffle dimensions of the speaker must align with the available clearance between the inner door skin and the trim panel surface.
- A 4-inch driver in a rear door panel position operates within a confined acoustic space, where the door cavity itself functions as a partial enclosure, influencing low-frequency reinforcement and overall output behavior.
- The 4-inch diameter specified for the BMW 328is rear door panel corresponds to a cone surface area suited to reproducing midband frequencies, generally covering the range where vocal presence, instrumental detail, and upper harmonic content are concentrated.
- Midrange is the speaker type listed as compatible with the 1996 BMW 328is rear door panel, a designation referring to drivers engineered specifically to reproduce the middle portion of the audible frequency spectrum, typically spanning approximately 300 Hz to 5 kHz.
- Midrange drivers are acoustically designed with a focused frequency bandwidth in mind, meaning the cone materials, surround compliance, and motor structure are optimized for clarity and linearity within that band rather than extended bass or high-frequency reproduction.
- A midrange driver installed in a rear door panel position contributes to the spatial imaging of the cabin by reinforcing the frequencies most associated with vocal intelligibility and tonal body of acoustic instruments.
- The rear door panel location places the speaker at a lower position relative to the listening height of seated occupants, a geometric factor that influences the directional arrival angle of midrange frequencies at the listener's ear.