Audioengine HD6 Powered SpeakersModern. In the classic sense. HD6 captures the spirit of of the world's most iconic speakers and blends it with the soul of a cutting edge connected machine. With support for the aptX HD audio codec built in, you can enjoy truly high resolution audio with all the convenience of a Bluetooth connection Efficient Integrated Design The speaker cabinets, drivers, bass port designs, amplifiers, and passive crossovers are all tuned together for the HD6.