Mercedes-Benz 400E Speaker Size

Dashboard Speaker

Rear Deck Lid Speaker

Mercedes-Benz 400E Speaker FAQ

What speakers should I replace first in my Mercedes-Benz 400E?

Replace the 5.25 inch rear deck speakers first. They handle most of your mid-bass output and will give you the biggest sound improvement for your money. The rear deck location in the 400E typically gets better airspace than the 4 inch dashboard speakers. Dashboard speakers are more about filling in vocals and upper frequencies anyway. You'll probably notice the difference immediately with the rear speakers - especially if you're running something around 50-60 watts RMS at 4 ohms.

Can I install component speakers in the Mercedes-Benz 400E dashboard location?

Stick with coaxial or full-range speakers for the 4 inch dashboard spots. The space constraints make component installation tricky - you'd need to find somewhere for the crossover and figure out tweeter mounting. Coaxial speakers work better here since they're designed as a complete unit. Look for something with a good frequency response range, maybe 80Hz to 20kHz. The dashboard position actually helps with stereo imaging when you use quality coaxials instead of trying to force components where they don't belong.

What's the difference between coaxial and full-range speakers for the 400E rear deck?

Coaxial speakers have a separate tweeter mounted on top of the woofer cone - usually gives you better high frequency extension and clarity. Full-range speakers use a single cone to cover the entire frequency spectrum, which can sound more cohesive but might lack some sparkle up top. For the 5.25 inch rear deck position in your Mercedes-Benz 400E, coaxials tend to work better because they can handle that 2kHz to 15kHz range more effectively. The rear deck gets decent bass response anyway, so you want those highs to balance things out.

How much power do I need for Mercedes-Benz 400E speaker upgrades?

Plan for around 40-75 watts RMS per channel at 4 ohms. The 5.25 inch rear speakers can probably handle up to 80 watts RMS without issues, while the 4 inch dashboard speakers should stay closer to 50 watts maximum. More important than peak power is clean power - a good 50 watt amplifier will outperform a cheap 100 watt unit every time. The factory wiring in the 400E should handle moderate power increases without modification. Just make sure your amp isn't clipping because that's what actually damages speakers.

Will aftermarket speakers fit the factory Mercedes-Benz 400E mounting points?

The 5.25 inch rear deck speakers should drop right in with standard aftermarket units. Most manufacturers use the same bolt pattern for this size. The 4 inch dashboard speakers might need adapter brackets depending on the brand - the Mercedes mounting isn't always exactly 4 inches. Measure the actual cutout diameter first. Sometimes it's closer to 3.5 inches or has an odd mounting depth. Pioneer and Alpine usually have good fitment data for European cars like the 400E, but always verify before ordering.