Mitsubishi Sigma Dashboard Speaker Size
The Mitsubishi Sigma dashboard accommodates a 4 inch speaker size and 3.5 inch speakers across the model's production span. Compatible audio types for these locations include midrange and full-range units. The specifications cover the 1989 to 1990 model years.
| Year | Type | Size (inch) |
|---|---|---|
| 1990 | Midrange | 4 |
| 1990 | Full-Range | 3.5 |
| 1989 | Full-Range | 3.5 |
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. |
| 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 Mitsubishi Sigma dashboard accommodates 2 distinct speaker sizes across the listed model years: 3.5 inch and 4 inch.
- Dashboard locations are typically shallow-mount environments with limited depth clearance, meaning mounting depth is a critical factor for speaker compatibility in the Sigma's dashboard positions.
- The dashboard placement positions speakers near the windshield and at ear level for front occupants, which influences how high and mid frequencies are projected into the cabin.
- The 4 inch size appears in the 1990 Sigma dashboard as a midrange-compatible position, and a speaker of that diameter produces a cone surface area suited to reproducing the middle portion of the audible frequency spectrum, roughly 500 Hz to 5,000 Hz.
- A midrange driver is a speaker type designed to handle only the middle band of frequencies, relying on separate woofers and tweeters in a multi-component system to cover bass and treble reproduction.
- Because midrange drivers are optimized for a narrow frequency band, the 1990 Mitsubishi Sigma 4 inch dashboard position is not intended to function as a standalone audio source in the absence of accompanying low- and high-frequency drivers.
- The 3.5 inch size is listed for both the 1989 and 1990 Sigma dashboard, and a speaker of that diameter has a relatively small cone area, which limits low-frequency output but supports upper-midrange and treble reproduction in a confined dashboard cavity.
- A full-range driver is a speaker type engineered to reproduce a wide span of audible frequencies within a single driver, typically covering bass, midrange, and treble without requiring additional components.
- In a dashboard location, a full-range driver in the 3.5 inch size functions as a self-contained audio source, which is practical given the space constraints common to dashboard enclosures in compact or mid-size vehicles.
- The small cone diameter of a 3.5 inch full-range driver means low-frequency response is naturally limited by physics, and bass reproduction in a dashboard-mounted position of the Sigma is accordingly constrained.
- Dashboard speaker cavities are generally integrated into the vehicle's molded instrument panel, which means aftermarket speaker mounting dimensions, including diameter and depth, must conform closely to the factory cutout specifications.