I use two subwoofers. one is Rythmik F12 and another is a passive Rockford FOSGATE Punch 10 subwoofer. one is ported and another is sealed. Integration is done via DAW ( my main player) for precise time alignment and crossover. Here is the video captured by binaural mics. You need a good headphones to actually hear the difference.
Rythmik vs cheap subwoofer; Sealed vs ported subwoofer.