BMW 640i xDrive Gran Coupe Speaker Size

Center Dash Speaker

Front Door Panel Speaker

Rear Door Panel Speaker

Rear Deck Lid Speaker

Rear Side Panel Speaker

Below Seats Speaker

BMW 640i xDrive Gran Coupe Speaker FAQ

Should I upgrade the front door speakers first in my BMW 640i xDrive Gran Coupe?

Replace the front door 4-inch component speakers first. These handle most of your music's midrange frequencies and vocals - you'll notice the biggest improvement here. The front doors use component speakers which means separate tweeters and woofers, giving you better sound staging than the coaxial speakers in other locations. Look for components rated around 40-60 watts RMS with 4-ohm impedance. The 1-inch tweeters can stay stock initially since upgrading the 4-inch drivers will improve overall clarity.

What's the difference between the coaxial speakers in my BMW 640i xDrive Gran Coupe?

Your BMW has two types of coaxial speakers - component and full-range. The front doors use component coaxials which typically offer better separation between frequencies. Rear doors, center dash, and deck lid use full-range coaxials that combine everything into one 4-inch driver. The rear side panel also gets 4-inch full-range speakers. Component systems usually handle power better and create more accurate imaging, though the difference might be subtle depending on your factory amplifier output.

Can I replace just the 8-inch subwoofer under the seats?

Yes, but verify your BMW 640i xDrive Gran Coupe's factory amplifier setup first. The under-seat 8-inch driver handles frequencies typically between 40-120 Hz. Most aftermarket 8-inch subs need 100-300 watts RMS and 4-ohm impedance to perform well. Your factory amp might not provide enough power for significant improvement. The location limits airspace too, so sealed enclosure subs work better than ported designs here. Consider if the factory integration allows for impedance changes.

Why does my BMW 640i xDrive Gran Coupe have so many 1-inch tweeters?

BMW uses multiple tweeters for better high-frequency distribution throughout the cabin. Front door, rear door, center dash, and rear deck tweeters create wider soundstaging. Each 1-inch tweeter handles frequencies above 3-4 kHz. The center dash tweeter fills in the gap between left and right channels. Rear deck tweeters add ambient high frequencies for passengers. You could upgrade them, but they're usually crossed over pretty high - maybe 5 kHz and up - so midrange improvements from the 4-inch speakers will be more noticeable.

Should I upgrade rear speakers in my BMW 640i xDrive Gran Coupe?

Focus on front speakers first, then consider rear upgrades. Your rear doors have 4-inch coaxial full-range speakers plus 1-inch tweeters. The rear deck lid mirrors this setup. Some models also have rear side panel 4-inch speakers. Rear speakers mainly provide ambience and fill for passengers, not primary listening. If you do upgrade, match the impedance to your front speakers - usually 4 ohms. The rear speakers probably receive less power from your factory amp anyway.