BMW 328d Speaker Size

Center Dash Speaker

Front Door Panel Speaker

Rear Door Panel Speaker

Rear Deck Lid Speaker

Below Seats Speaker

BMW 328d Speaker FAQ

Which BMW 328d speakers should I replace first for maximum sound improvement?

Start with the front door panel 4 inch component speakers. These handle most of your mid-range frequencies and vocals - probably the most noticeable upgrade. The BMW 328d uses a component setup in front doors, meaning the tweeter and woofer work together. Replace both the 4 inch driver and 1 inch tweeter as a matched pair. Look for components rated around 60-80 watts RMS with 4-ohm impedance. The front stage creates your primary soundstage, so this gives you the biggest bang for your buck.

Can I replace just the BMW 328d tweeters without changing the main speakers?

You could, but it's not ideal. The 1 inch tweeters in your BMW 328d are likely matched to specific crossover points - usually around 3500-4000 Hz. Swapping only tweeters might create frequency gaps or overlaps. The front door uses component setup, rear doors and center dash use coaxial or full-range. If you're determined to do tweeters only, stick with similar sensitivity ratings - probably 89-92 dB. But honestly? You'll get better results replacing the whole component set in front doors first.

What's the difference between the rear door and center dash speakers in my BMW 328d?

Both locations use 4 inch drivers with 1 inch tweeters, but they serve different purposes. Rear door speakers provide ambient fill and rear passenger coverage. Center dash speakers... well, they're positioned for specific imaging depending on your BMW 328d's audio system configuration. The rear doors are labeled as coaxial full-range, while center dash might be similar. Power handling is probably around 40-60 watts for these locations. The mounting depth could vary though - center dash typically has less space behind it.

Should I upgrade the 8 inch subwoofer below the seats in my BMW 328d?

That 8 inch driver below the seats handles your low-end - typically 20-120 Hz range. Whether it needs upgrading depends on your bass preferences. BMW 328d factory subs are usually adequate for most listeners. If you want more punch, look for 8 inch subs with higher power handling - maybe 150-200 watts RMS instead of the factory 80-100 watts. But check your amplifier first. The factory amp might be limiting factor, not the speaker itself. Sometimes adding sound deadening around the sub enclosure gives better results than swapping the driver.

Do all the tweeters in my BMW 328d need to be the same brand?

Not necessarily, but it helps with consistency. Your BMW 328d has 1 inch tweeters in four locations - front doors, rear doors, center dash, and rear deck. The front door tweeters should definitely match their corresponding 4 inch components. For the others... similar frequency response curves would be ideal. Most aftermarket tweeters cross over around 3000-5000 Hz anyway. If you're replacing everything gradually, at least keep the front stage matched as a priority. The rear fill speakers are less critical for perfect matching.