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A 6.5-inch car audio speaker with a 4Ω impedance and an RMS power rating of 30W is a common specification for a mid-range woofer in a car audio system. This size is commonly used in car audio systems and is suitable for most standard speaker mounting locations.
The 4Ω impedance rating indicates the electrical resistance of the speaker. It affects how much power the speaker draws from the car's amplifier. Make sure your car's amplifier is compatible with a 4Ω speaker or adjust the wiring configuration accordingly.
The 6.5-inch speaker specified as a "woofer" indicates that it is primarily designed to reproduce lower frequencies, such as bass and mid-bass sounds. It will provide better bass response compared to smaller speakers but may not reproduce very low frequencies as well as larger subwoofers.
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