Alfa Romeo 164 Front Door Panel Speaker Size
The Alfa Romeo 164 front door panel accommodates a 4 inch speaker size. Midrange units are the compatible audio types for the front door panel location. These specifications cover the 1991 model year system.
| Year | Type | Size (inch) |
|---|---|---|
| 1991 | 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 front door panel of the 1991 Alfa Romeo 164 accommodates a 4-inch speaker cutout, a relatively compact mounting diameter that constrains cone surface area and limits low-frequency displacement.
- Door panel locations are typically recessed within a baffle cavity formed by the inner door skin and trim panel, which affects the acoustic loading on the driver and influences rear-wave behavior.
- A 4-inch driver in a door panel position operates within a partially enclosed rear volume created by the door cavity, which can provide some acoustic boundary support but also introduces reflections from the door's inner metalwork.
- The 4-inch diameter specified for this location corresponds to a speaker size whose usable frequency range generally spans the upper-bass through upper-midrange bands, roughly 200 Hz to 5 kHz depending on driver design.
- At 4 inches, cone excursion and surface area are insufficient to reproduce deep bass frequencies with meaningful output, making the front door panel of the 164 unsuitable for low-frequency reinforcement at the factory-specified size.
- The midrange type listed as compatible for the 1991 Alfa Romeo 164 front door panel designates a driver engineered specifically for the reproduction of vocals, instruments, and harmonics occupying the middle portion of the audible spectrum.
- Midrange drivers are typically designed with a relatively stiff cone and controlled excursion to minimize distortion across their intended passband, prioritizing tonal accuracy over broad frequency extension.
- Midrange speakers in a door panel position benefit from forward-facing directional output aimed toward the cabin, though reflections off window glass and door surfaces can introduce comb filtering at higher frequencies within the midrange band.
- The midrange type is generally used within a multi-speaker system where a separate woofer handles low frequencies and a tweeter handles high frequencies, positioning the door panel driver as a dedicated band-pass element in the front stage.