Lexus SC400 Speaker Size

Front Door Panel Speaker

Rear Speaker

Rear Deck Lid Speaker

Lexus SC400 Speaker FAQ

What speakers should I replace first in my Lexus SC400 for the biggest sound improvement?

Start with the front door panel 4-inch speakers. These handle most of your vocal frequencies and midrange content. The front speakers typically get more use than rear components, so upgrading them first gives you immediate improvement in clarity and staging. Look for 4-inch component speakers rated around 50-75 watts RMS with 4-ohm impedance. The rear 4-inch coaxials can wait since they mainly provide fill. That 10-inch rear deck subwoofer... well, if bass is your priority then maybe reconsider the order.

Can I install component speakers in the front doors of my Lexus SC400?

Yes, the Lexus SC400 front door panels are already set up for component speakers. You'll need separate tweeters and woofers instead of coaxial units. Mount the 4-inch woofers in the existing door locations and find tweeter mounting spots - usually in the door panel or A-pillar. Component systems typically offer better imaging since you can position tweeters at ear level. Expect crossover frequencies around 3000-4000 Hz for proper separation. Just verify your amplifier can handle the component system's power requirements.

What's the difference between coaxial and full-range speakers in the Lexus SC400 rear position?

Both terms describe the same basic concept for the rear 4-inch speakers in your Lexus SC400. Coaxial means the tweeter sits mounted on top of the woofer cone. Full-range indicates these speakers attempt to reproduce the entire frequency spectrum from one driver location. The rear speakers handle frequencies roughly from 80 Hz to 20 kHz, though the 4-inch size limits deep bass output. These speakers provide ambient fill and maybe some stereo width. Don't expect much below 100 Hz from 4-inch drivers regardless of the marketing claims.

Should I upgrade the 10-inch subwoofer in my Lexus SC400 rear deck?

That depends on your bass expectations and the current subwoofer's condition. The 10-inch rear deck location offers decent bass extension, probably down to 40-50 Hz with proper enclosure design. If the original subwoofer still works, you might just need amplification improvements. Replacement 10-inch subs should handle 100-200 watts RMS for meaningful upgrade. Consider the deck lid mounting challenges though - some aftermarket subs require different mounting depths or enclosure volumes. The Lexus SC400 deck space might limit your options more than the front door speakers.