Volvo 740 Rear Door Panel Speaker Size
The Volvo 740 rear door panel accommodates a 4 inch speaker size. The compatible type for the audio system is midrange. These specifications cover the years 1990 to 1992.
| Year | Type | Size (inch) |
|---|---|---|
| 1992 | Midrange | 4 |
| 1991 | Midrange | 4 |
| 1990 | 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 Volvo 740 accommodates a 4-inch speaker opening across the 1990, 1991, and 1992 model years.
- A 4-inch driver in a door panel occupies a shallow, space-constrained cavity where cone excursion and enclosure volume are limited by the door's internal structure.
- Door panel mounting positions speakers within a reflective, irregular enclosure formed by the door's inner and outer metal skins, which affects resonance and rear-wave behavior.
- The Volvo 740 rear door panel's 4-inch aperture constrains the diaphragm surface area, which directly limits low-frequency displacement capability compared to larger formats.
- A 4-inch speaker in a door location sits closer to the lower seat occupant's ear level, influencing the perceived stereo imaging angle relative to front-mounted drivers.
- Midrange drivers are designed to reproduce the frequency band roughly between 300 Hz and 5 kHz, covering the core of human vocal intelligibility and the fundamental tones of most acoustic instruments.
- The Volvo 740 rear door panel's designation of midrange as the compatible type indicates the installation is suited to a driver optimized for cone pistonic motion in the mid-frequency band rather than extended bass excursion or high-frequency dispersion.
- Midrange speakers typically use a relatively stiff cone and a moderate surround to maintain controlled movement across the vocal band, which is relevant to door panel installations where unwanted vibration from door hardware can color reproduced sound.
- In a rear door panel position, a midrange driver does not operate as a full-range source; the upper frequency limit of a midrange unit means high-frequency content above approximately 5 kHz is not reproduced at that location.
- The 4-inch diameter is a geometry associated with relatively high sensitivity across the midrange band due to a favorable ratio between cone mass and surface area at those frequencies.