The most dramatic improvement you will ever make to any audio system is by adding a subwoofer. Why? Dynamic bass is heard as well as felt! It adds emotion to the music. A great subwoofer makes an impression on everyone. Diamond Audio offers five different series of subwoofers. Each as unique as the people who use them. From the patented TDX^TM technology of the HEX Pro, to the shallow mount convenience of the HEX Shallow, installers the world over have been raving about the flexibility of Diamond Audio subwoofers for years.