Hi Mika it's not tuned, it's a sealed enclosure.
It is sealed enclosure and we are not talking of the same 'tuning' as in vented. Sealed ofc has tuning freq which is comparable to volume and in this case it is 38Hz.It's tuned to 38Hz, and ur in-room response is flat to 18 ?? :scratch:
After re-reading, this explains it better for me, I wouldn't be getting that sort of room gain at all :cunning:+ Frequence response rolloff better suited for massive room gains at lower end.