BMW 328i Center Dash Speaker Size
The BMW 328i center dash location accommodates a 1 inch speaker size and 4 inch speakers. Compatible audio types for the center dash include tweeters and midrange units. These specifications cover a range from 2007 to 2015.
| Year | Type | Size (inch) |
|---|---|---|
| 2015 | Tweeter | 1 |
| 2015 | Midrange | 4 |
| 2014 | Tweeter | 1 |
| 2014 | Midrange | 4 |
| 2013 | Tweeter | 1 |
| 2013 | Midrange | 4 |
| 2012 | Midrange | 4 |
| 2011 | Tweeter | 1 |
| 2011 | Midrange | 4 |
| 2010 | Tweeter | 1 |
| 2010 | Midrange | 4 |
| 2009 | Midrange | 4 |
| 2008 | Midrange | 4 |
| 2007 | Midrange | 4 |
Speaker Types
| Type | Description |
|---|---|
| Tweeter | A small driver built for high frequencies, typically from about 2,000 Hz to 20,000 Hz. It adds treble detail and clarity and is usually mounted near ear level or aimed at the listener. |
| 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 center dash location in the BMW 328i sits at the forward centerline of the cabin, positioning speakers along the horizontal axis between driver and front passenger to create a focused stereo image toward the windshield.
- A center dash installation typically occupies a shallow, constrained cavity within the dashboard structure, which limits the depth available for speaker basket and magnet assembly.
- The 4-inch midrange driver is the consistent fitment across all model years listed for the BMW 328i center dash position, indicating the location is dimensionally sized around a 4-inch mounting diameter.
- A 4-inch driver operating as a midrange unit handles the vocal and instrumental frequency band, generally covering the range from approximately 300 Hz to 5,000 Hz, where much of the tonal definition and harmonic content of audio material is concentrated.
- Positioning a midrange driver at the center dash places the primary vocal and tonal frequency source near ear level and toward the front of the cabin, reinforcing a stable, centered soundstage.
- The 1-inch tweeter appears at the center dash position for the 2010, 2011, 2013, 2014, and 2015 BMW 328i model years, indicating the location accommodates a secondary high-frequency driver in addition to the 4-inch midrange during those years.
- A 1-inch tweeter is designed to reproduce high frequencies, typically from around 2,000 Hz to 20,000 Hz, and the small diaphragm diameter supports the wide dispersion pattern necessary for high-frequency content at close listening distances.
- Placing a 1-inch tweeter at the center dash allows high-frequency energy to radiate forward and upward toward the windshield, contributing to perceived airiness and detail in the upper register of the audio spectrum.
- The pairing of a 1-inch tweeter and a 4-inch midrange at the same center dash location indicates the mounting space accommodates 2 discrete driver cutouts within the same dashboard panel for the years in which both sizes are listed.
- The 4-inch midrange, given its cone area and typical resonant frequency characteristics, is generally not well suited to bass reproduction, which is consistent with a center dash location that does not support the enclosure volume required for low-frequency output.
- The shallow depth characteristic of a center dash cavity is acoustically relevant to the 1-inch tweeter, as dome tweeters of that size require minimal mounting depth compared to larger cone drivers, making them compatible with tight dashboard installations.
- For the 2012 BMW 328i center dash, the specifications list only the 4-inch midrange without a corresponding 1-inch tweeter, distinguishing that model year from adjacent years in the series.