Lexus GS400 Speaker Size

Front Door Panel Speaker

Rear Door Panel Speaker

Rear Deck Lid Speaker

Lexus GS400 Speaker FAQ

What size speakers fit in the front doors of a Lexus GS400?

6.5 inch speakers mount in the front door panels. You can install either coaxial or component speakers in this location. Component systems typically deliver better sound separation since the tweeter mounts separately from the woofer. Coaxial speakers might be easier to install though - everything's in one unit. Most aftermarket 6.5 inch speakers should fit the factory mounting points in your Lexus GS400.

Can I upgrade the rear door speakers in my Lexus GS400 to components?

Yes, the rear doors accept 6.5 inch component speakers along with coaxial and full-range options. Component speakers in the rear can enhance your soundstage width. However, you'll need to verify tweeter mounting locations since the factory setup varies. The rear doors in the Lexus GS400 seem designed to accommodate different speaker types, which gives you flexibility for upgrades.

What's the subwoofer situation in a Lexus GS400?

There's a 10 inch subwoofer mounted in the rear deck lid. This location actually works well for bass distribution throughout the cabin. If you're upgrading, measure the mounting depth carefully - deck lid installations can be tricky with clearance. A replacement 10 inch sub should handle 150-300 watts RMS depending on your amplifier setup. The factory location suggests the Lexus GS400 was designed with decent low-frequency response in mind.

Should I replace front or rear speakers first in my Lexus GS400?

Start with the front door speakers. You spend most listening time facing forward, so front 6.5 inch upgrades deliver the most noticeable improvement. The front doors in your Lexus GS400 handle mid-range and vocal frequencies that you hear most clearly. Rear speakers mainly fill in ambient sound. That 10 inch rear subwoofer probably still sounds decent if it's working properly, so prioritize the fronts first.

What impedance should I look for in Lexus GS400 replacement speakers?

Stick with 4-ohm speakers for the 6.5 inch positions. Most factory systems in the Lexus GS400 expect this impedance load. Using 8-ohm speakers might reduce output from your head unit. The 10 inch subwoofer location could handle different impedances depending on whether you're using the factory amp or adding an aftermarket one. Check your existing speakers if possible - they'll usually have impedance marked on the magnet.

Do I need an amplifier for speaker upgrades in a Lexus GS400?

Not necessarily for the 6.5 inch door speakers. The factory head unit should drive most aftermarket speakers adequately - maybe 15-25 watts RMS per channel. The 10 inch subwoofer benefits more from dedicated amplification though. Deck lid subs need proper power to move air effectively in that location. If you notice the new door speakers sound weak, then consider adding an amp. The Lexus GS400 factory system isn't terrible, so start simple and add power if needed.