Audi 100 Speaker Size

Dashboard Speaker

Rear Deck Lid Speaker

Audi 100 Speaker FAQ

What speakers should I replace first in my Audi 100 - the 6.5-inch rear deck or 4-inch dashboard speakers?

Replace the 6.5-inch rear deck speakers first. They handle most of your bass response and midrange warmth, typically around 25-60 watts RMS at 4 ohms. The dashboard 4-inch speakers mostly fill in treble detail - around 15-25 watts RMS. Your Audi 100's rear deck placement gives better acoustic coupling with the cabin space. Component speakers work exceptionally well here since you can mount tweeters separately for imaging. Though coaxials might be easier if you're keeping the factory mounting locations.

Can I install component speakers in both the Audi 100 rear deck and dashboard locations?

The rear deck lid accepts components easily - separate the woofer and tweeter for better staging. Dashboard mounting gets tricky though. Those 4-inch openings work better with full-range or coaxial designs. Component tweeters need proper angling and the Audi 100 dashboard doesn't always provide ideal tweeter placement options. You might end up with tweeters firing into your knees rather than your ears. Stick with quality coaxials up front, components in back. Crossover frequencies around 3-4kHz typically work well for this split configuration.

What's the difference between coaxial and full-range speakers for the Audi 100 dashboard position?

Full-range speakers use a single driver to cover the entire frequency spectrum - usually 80Hz to 20kHz in a 4-inch size. Coaxials mount a separate tweeter on the woofer cone, creating distinct frequency separation around 3-5kHz. The Audi 100's dashboard position benefits from coaxials since you get dedicated treble projection. Full-range speakers sometimes beam their highs oddly. Though some audiophiles prefer full-range for phase coherence. Impedance stays at 4 ohms either way. Power handling differs - coaxials might handle 20-30 watts while full-range tops out around 15-20 watts in 4-inch format.

How do I verify my Audi 100 speaker sizes before ordering replacements?

Measure the mounting hole diameter, not the speaker frame. The 6.5-inch rear deck speakers should have mounting holes around 5.5 inches. Dashboard speakers measure closer to 3.5 inches for true 4-inch drivers. Check mounting depth too - the Audi 100 rear deck typically accommodates 2.5-3 inches of speaker depth. Dashboard space runs tighter, maybe 1.5-2 inches maximum. Pull one speaker out first. Some aftermarket speakers use metric measurements that don't translate perfectly. The mounting screw pattern matters as much as diameter - count the holes and measure their spacing.