BMW 535is Speaker Size

Front Kick Panel Speaker

Rear Deck Lid Speaker

BMW 535is Speaker FAQ

What speakers should I replace first in my BMW 535is for better sound quality?

Replace the front kick panel speakers first. These 4 x 6 inch coaxials handle most of your music's critical midrange frequencies and vocals. Front speakers typically receive 60-70% of the audio signal from your head unit, so upgrading them delivers the most noticeable improvement. The rear deck speakers can wait - they mainly fill in ambient sound. Focus your budget on quality front replacements with higher power handling, maybe 50-75 watts RMS instead of the stock 15-20 watts.

Why does my BMW 535is have the same speaker size in both front and rear locations?

The 4 x 6 inch format was common in late 80s luxury cars because it provided decent bass response in compact spaces. BMW likely chose this size for both positions to simplify manufacturing and parts inventory. However, the kick panel location actually works better acoustically - speakers fire toward your ears rather than reflecting off surfaces. The rear deck placement tends to muffle sound through seat backs and creates phase issues. Same size doesn't mean same performance in different locations.

Can I upgrade to component speakers in my BMW 535is kick panels?

Probably not without significant modification. The 4 x 6 inch opening is designed for coaxial full-range speakers where the tweeter mounts in the center of the woofer. Component systems need separate tweeter mounting locations, which the BMW 535is kick panels don't provide. You'd need to cut new tweeter holes or find surface-mount positions. Stick with high-quality coaxials - modern ones with silk dome tweeters and better crossovers will still dramatically improve over stock speakers. Look for 4-ohm impedance to match your factory wiring.

What power handling should I look for in BMW 535is replacement speakers?

Target 40-75 watts RMS for the 4 x 6 inch speakers. Your factory head unit probably outputs around 15-20 watts per channel, so you have headroom for future amplifier upgrades. Higher power handling usually means better build quality and less distortion at normal volumes. Don't get caught up in peak power ratings - they're marketing numbers. RMS power tells you what the speaker can handle continuously. The coaxial design limits power somewhat since the tweeter shares the same basket as the woofer.