sir. you are seriously mistaken.
36-40hz is the worst tuning that we guys do here in pakistan.
30hz tuning is going to give a more flatter response from 35 to 80/90Hz...
whereas 37-40hz tunings will give a peak, which kills music.
and besides, this is a compact design. around 2.2cuft internal. it will never be boomy. infact it will be tight and quite accurate. you can ask JZ..
30hz tuning in an oversized enclosure is going to be boomy and give loads of bass which would not be good for regular music.
also, the vent area is not too much in this box. hence the subwoofer stays within control, and does not bottom out. picks up good highs as well...