One of the reasons Audioengine active and passive speakers have such amazing bass in such a small package are the designs of the bass ports on each speaker. These aren’t just holes or slots in the cabinets, but specifically shaped openings with tubes designed with precise calculations. The result is incredible low end with minimal audible air turbulence. These are effectively mini-subs built into each speaker, allowing Audioengine speakers to be used with or without a separate subwoofer. It's also worth mentioning that we don’t use any enhancement circuits to add fake bass, so what you’ll hear is real bass- low and clean.