TOPPING E70V AKM DAC. The ‘V’ in the name of the Topping E70V is a reference to the VELVET SOUND technology of AKM DACs. You can read more about the technology, here. Most of you are already familiar with this technology, reminding you that it has been around for quite a long time, and Astell&Kern pioneered its marketing in portable devices. The E70V is named with the letter ‘V’ in its name, referring to the VELVET SOUND technology of AKM DACs. The E70V comes with the revised flagship DAC chip 4499EX and the price is $449$.