HDX Series Speakers. The speakers that are built to keep up! Our HDX Series has been such a game changer, that we needed coaxials to keep up with the fantastic subwoofers, that we have developed. With these HDX series speakers, we achieved that. With a 3.5" Midrange, 5.25" Coaxial, 5x7" Coaxial 6.5" Coaxial, and of course, the beefy 6x9" Coaxial; you have a variety of options to achieve this upgraded sound with. When we were developing this line, we knew we needed it to look just as good as it sounds, while still remaining affordable. When you need confidence putting in new speakers in stock locations, that you can send good power to; HDX series is the way to go!