BMW 740Ld xDrive Speaker Size

Center Dash Speaker

Front Door Panel Speaker

Rear Door Panel Speaker

Rear Deck Lid Speaker

Below Seats Speaker

BMW 740Ld xDrive Speaker FAQ

Which speakers should I replace first in my BMW 740Ld xDrive for the biggest sound improvement?

Start with the front door panel components. Replace both the 4-inch coaxial component speakers and 1-inch tweeters together since they work as a matched system. These handle most of your music's midrange and highs - around 80Hz to 20kHz typically. The front stage creates your stereo imaging, so upgrading here first gives you the most noticeable improvement. After that, consider the 8-inch subwoofer below the seats if you want more bass response below 100Hz.

What's the difference between the coaxial component speakers in front doors versus the full-range coaxials elsewhere in my BMW 740Ld xDrive?

Component speakers separate the tweeter from the woofer, allowing better placement and crossover tuning. Your front doors use this setup with dedicated 1-inch tweeters mounted separately from the 4-inch mid drivers. The rear doors and dash use full-range coaxials where the tweeter sits directly on the woofer cone. Components typically offer better soundstage and frequency separation, but they're more complex to install. Full-range speakers are simpler but may have some frequency overlap issues around the crossover point.

Can I upgrade just the tweeters in my BMW 740Ld xDrive without changing the other speakers?

You could replace the 1-inch tweeters independently, but it's not ideal. The existing tweeters are likely matched to work with the 4-inch drivers at specific crossover frequencies - usually around 3-4kHz. Installing aftermarket tweeters with different sensitivity ratings (maybe 89dB vs 92dB) or impedance could create volume imbalances. The dash and rear deck tweeters might be easier to replace since they're separate from the full-range speakers. However, you'll get better results upgrading complete component sets rather than mixing old and new drivers.

Why does my BMW 740Ld xDrive have so many 4-inch speakers instead of larger ones?

Space constraints mostly. The door panels, dash, and rear deck areas can only accommodate 4-inch drivers while maintaining the interior design. Smaller speakers also tend to have better off-axis response, which matters in a car where listeners aren't positioned optimally. Multiple 4-inch speakers can actually move more air collectively than fewer large ones. The 8-inch subwoofer below the seats handles the low frequencies that 4-inch drivers can't reproduce effectively - typically below 80-100Hz. This multi-driver approach allows each speaker to focus on its optimal frequency range.