BMW 528i Speaker Size

Front Door Panel Speaker

Rear Deck Lid Speaker

Center Dash Speaker

Rear Door Panel Speaker

Below Seats Speaker

Front Kick Panel Speaker

BMW 528i Speaker FAQ

Which speakers should I replace first in my BMW 528i for the biggest sound improvement?

Start with the front door panel speakers. The 4 inch coaxial/component speakers in your BMW 528i handle most of the midrange frequencies you actually hear. Replace these before touching tweeters or rear speakers. Look for speakers rated around 50-75 watts RMS with 4-ohm impedance. The front door location gives you the most direct sound path to your ears, so upgrades here make the biggest difference. Rear deck speakers can wait - they mostly fill in ambient sound.

Can I install component speakers in my BMW 528i front doors instead of coaxials?

Yes, the front door panels in BMW 528i models typically accommodate both coaxial and component setups. Component systems separate the tweeter from the woofer, giving you better imaging. You'll need to mount the tweeter separately - usually in the existing tweeter location or door panel. The 4 inch woofer goes in the main door speaker location. Make sure your aftermarket components can handle the factory amplifier output, usually around 25-40 watts. Component speakers often need crossovers, which might require some creativity for mounting in the BMW 528i door panel space.

What's the difference between the 1 inch tweeters and 4 inch speakers in my BMW 528i?

The 1 inch tweeters handle high frequencies above 3000Hz - think cymbals, vocal clarity, upper harmonics. The 4 inch speakers cover midrange and some bass, roughly 80Hz to 5000Hz. In your BMW 528i, the tweeters are positioned for direct high-frequency dispersion while the 4 inch units do the heavy lifting. If you're upgrading, the 4 inch speakers will give you more noticeable improvement. Tweeters matter more for fine-tuning after you've upgraded the main drivers. Some people replace tweeters first because they're easier to access, but that's backwards thinking.

Should I upgrade the 8 inch subwoofer under the seats in my BMW 528i?

The under-seat 8 inch woofer in your BMW 528i provides bass extension below what the door speakers can handle. It's not a true subwoofer - more like a mid-bass driver covering maybe 40-200Hz. Upgrading this can tighten up bass response, but you're limited by the enclosed space under the seat. Look for 8 inch drivers with higher sensitivity ratings, around 88-92dB. Power handling should match your factory amplifier, probably 75-100 watts RMS. Don't expect earth-shaking bass from this location though. If you want real low-end, you'll need a proper subwoofer installation elsewhere in the BMW 528i.