BMW 228i Speaker Size

Rear Side Panel Speaker

Center Dash Speaker

Front Door Panel Speaker

Rear Deck Lid Speaker

Below Seats Speaker

BMW 228i Speaker FAQ

What BMW 228i speakers should I upgrade first for the biggest sound improvement?

Start with the front door 4-inch component speakers. These handle most of your midrange frequencies and vocals - around 250Hz to 4kHz typically. The BMW 228i front doors already have separate tweeters, so you're working with a proper component setup. Replace both the 4-inch drivers and 1-inch tweeters together for best results. You might see 15-20 watts RMS handling with decent aftermarket units. The center dash speakers come next, but honestly? The front doors make the biggest difference since that's where most stereo imaging happens.

Can I replace just the BMW 228i tweeters without touching the other speakers?

You could replace just the 1-inch tweeters, but it's not ideal. The BMW 228i has tweeters in multiple locations - front doors, center dash, rear deck, and rear side panels. Each tweeter is typically crossed over around 3-4kHz. If you upgrade only tweeters, you might get harsh sound or poor integration. The factory crossover network expects specific impedance, usually 4 ohms. New tweeters might be 8 ohms or have different sensitivity ratings. Better to upgrade the whole component set in each location. Though if budget's tight, start with front door tweeters since those affect the soundstage most.

What's the difference between the rear deck and rear side panel speakers in the BMW 228i?

The rear deck speakers are 4-inch coaxial full-range units with separate 1-inch tweeters. Rear side panels also use 4-inch coaxials but these might be positioned differently for sound dispersion. Both locations probably handle similar frequency ranges - maybe 80Hz to 15kHz for the coaxials. The side panels could provide better stereo separation since they're not firing up from the deck. However, rear speakers in the BMW 228i are mainly for fill and ambiance. You're not getting serious imaging from either location. The deck position might give slightly more bass response due to the larger mounting surface acting as a baffle.

Why does my BMW 228i have an 8-inch subwoofer under the seats?

BMW mounted an 8-inch woofer under the seats to handle low frequencies without taking up trunk space. This location probably gives response down to 40-50Hz, though it's not a true subwoofer setup. The under-seat position provides decent bass distribution throughout the cabin. It's likely a passive radiator or ported design to maximize output in that confined space. Power handling is probably modest - maybe 50-80 watts RMS. The BMW 228i's under-seat woofer works with the factory amplifier's crossover settings. If you're upgrading, consider whether this location gives you enough bass or if you need a proper trunk-mounted subwoofer for deeper extension.