Been doing some research over at the Hyundai Forums site and Dimensions have been mentioned. In fact, Harman International is the main supplier to Hyundai/Kia. Harman International makes JBL and Infinity speakers. Most of their speakers are 2 ohm and just the trick for upgrading a Hyundai/Kia OEM head unit. From what I understand, most of the new OEM systems are lower ohm rated than several years ago. By upgrading to the JBL or Infinity speakers you will get better sound than any 4 ohm speaker out there.