BMW M4 Speaker Size

Rear Side Panel Speaker

Center Dash Speaker

Front Door Panel Speaker

Rear Speaker

Below Seats Speaker

BMW M4 Speaker FAQ

Which BMW M4 speakers should I upgrade first for the biggest sound improvement?

Start with the front door panel 4 inch component speakers. These handle most of your mid-range frequencies and vocals - replacing them typically delivers the most noticeable upgrade. The BMW M4 uses a component system up front, so you're getting separate woofers and tweeters which generally sounds cleaner than coaxial setups. After the fronts, consider the 8 inch subwoofer below the seats if you want more bass impact. The rear speakers matter less since you're usually sitting in front, though the 4 inch coaxials back there can add some fill if you carry passengers often.

What's the difference between the coaxial and component speakers in my BMW M4?

Your M4 has component speakers in the front doors - that means separate 4 inch woofers and 1 inch tweeters working together. Components usually sound more detailed because each driver handles its specific frequency range without compromise. The rear and side panels use coaxial speakers where the tweeter sits mounted in the center of the 4 inch woofer. Coaxials are simpler to install and generally less expensive, but components typically offer better imaging and clarity. The center dash also runs coaxials, probably around 15-25 watts RMS handling. When upgrading, component systems often justify the extra cost if you're serious about sound quality.

Can I replace just the tweeters in my BMW M4 without changing the other speakers?

You could replace just the 1 inch tweeters, but it's not usually the best approach. Tweeters and woofers in component systems are designed to work together - they're crossover-matched for specific frequency handoffs, typically around 2.5-4 kHz. Mixing different brands or specifications might create volume imbalances or frequency gaps. The BMW M4 has tweeters in multiple locations: front doors, rear panels, rear side panels, and center dash. If one tweeter is blown or damaged, matching the replacement to your existing woofers becomes important. Better to upgrade the complete component set in the front doors first, then work on other locations if needed.

What power handling should I look for when upgrading BMW M4 speakers?

The factory speakers in your M4 probably handle around 20-40 watts RMS, maybe 60-80 watts peak. When upgrading, look for aftermarket speakers that can handle 50-75 watts RMS for the 4 inch drivers. The 8 inch subwoofer below the seats might handle 100-150 watts RMS depending on your audio package. Don't obsess over maximum power ratings - they're often inflated marketing numbers. Focus on RMS (continuous) power handling instead. Your BMW M4's factory amplifier puts out moderate power levels, so extremely high-power speakers won't necessarily perform better. Efficiency ratings around 87-92 dB sensitivity work well with most factory head units and amps.