Right now I have a 3.7 cu ft net box with a square port 15.5 in. by 2 in. and a elemental designs 160v.2 driver in it and am contemplating building 2- 6.0 cu. ft. net vented boxes tuned to 18 hz with the shiva-x 12 drivers and am hopeing for similar or better performance. Not unhappy with sub I have now, just bored and want to do something different. :daydream: