Lexus RX400h Speaker Size

Front Door Panel Speaker

Overhead Speaker

Rear Door Panel Speaker

Cargo Area Speaker

Lexus RX400h Speaker FAQ

Which speakers should I replace first in my Lexus RX400h for the biggest sound improvement?

Start with the front door panel 6.5 inch speakers. These handle most of your music's midrange and vocal frequencies - replacing them delivers the most noticeable upgrade. Look for component speakers rated around 75-100 watts RMS with 4-ohm impedance. The front doors in the RX400h have decent mounting depth, so you've got options. After the fronts, tackle the rear door panels with matching 6.5 inch speakers to maintain sound balance throughout the cabin.

Can I install component speakers in all door locations of my Lexus RX400h?

Yes, both front and rear door panels accept component speakers. The 6.5 inch openings work well with most aftermarket component sets. You'll need to find mounting spots for the tweeters though - the RX400h doesn't always have dedicated tweeter locations. Some people mount them in the door panels near the mirrors, others use the existing overhead 3.5 inch locations if they're not being used. Component separation gives you better imaging than coaxials, especially in the front stage.

What's the deal with the 10 inch subwoofer location in the Lexus RX400h cargo area?

The cargo area houses a factory subwoofer in some RX400h models. It's typically an 8-ohm unit powered around 150-200 watts. If you're upgrading, you might want something with more punch - look for aftermarket 10 inch subs that can handle 300-500 watts RMS. The location works well for bass response since it's in an enclosed space. Just verify your amp can drive whatever impedance you choose. Some installations benefit from a sealed enclosure to maintain tight bass response.

Should I bother upgrading the 3.5 inch overhead speakers in my Lexus RX400h?

Depends on your priorities. These overhead speakers typically handle ambient fill and sometimes rear channel information. They're usually full-range or coaxial types rated maybe 20-40 watts. If you've already upgraded your door speakers and subwoofer, then yes - complete the system. Otherwise, focus your budget elsewhere first. The 3.5 inch size limits how much bass these can produce anyway. Look for speakers with good frequency response in the 80Hz-20kHz range if you do upgrade them.

What impedance should I look for when replacing speakers in my Lexus RX400h?

Stick with 4-ohm speakers for the door locations. The factory amplifier in the RX400h expects this impedance load. Going to 8-ohm speakers might reduce your power output, while 2-ohm loads could stress the amp. For the subwoofer location, you have more flexibility - 4-ohm or 8-ohm both work depending on your amplifier setup. If you're adding an aftermarket amp, match the speaker impedance to what your new amp handles best. Most quality aftermarket speakers come in 4-ohm versions anyway.