The 30 inch version gets you an 8 inch sub while the 40 inch version packs a 10 inch subwoofer.
Energy's new Power Bar and Power Bar Elite are different from most soundbars in that they utilize a true two-way speaker design. They utilize a .78 inch tweeter and two 3 inch bass drivers to provide sound and boast a 3D Surround mode to simulate a 5.1 home theater system.
The Power Bar Elite measures in at 40 inches long, offers a 40Hz to 20kHz frequency response and a 10 inch side-firing subwoofer. The Power Bar - not elite - only goes down to 50Hz and comes with an 8 inch sub.