To compensate for added resistance from factory-installed speaker wiring, these component speakers feature 3-ohm voice coils that ... while the 1/2" silk dome tweeters with neodymium magnets ...

Speakers and amplifiers alike are usually rated around 8 ohms, but that's not always the case. If your receiver is rated at 6, for example, does that mean you can't connect 8 ohm speakers?