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Car speakers are easy to upgrade, but fitment and power ratings cause most mistakes.
This guide explains the basics before you shop our 6.5-inch and 6×9 picks.
Last updated: October 30, 2026.
Check the Size First
Common sizes include 6.5-inch, 6×9-inch and 4×6-inch. Confirm your vehicle before buying, including mounting depth.
RMS vs Peak Power
RMS shows continuous power handling; peak is a larger short-term number. Match RMS to your radio or amp.
Coaxial vs Component
Coaxial speakers put the tweeter on the woofer and are drop-in. Component speakers separate the tweeter for better imaging but need more installation.
Sensitivity
Higher sensitivity plays louder from a low-power factory radio.
Frequently Asked Questions
Do I need an amp for aftermarket speakers?
Not always, but higher-RMS speakers benefit from one.
Are component speakers better?
They can image better but cost more and take more work.
What wire should I use?
See our wire gauge guide.
Bottom Line
Check fitment, match RMS to your power source, and choose coaxials for easy swaps or components for better imaging.
