i beleive the box has aroun 4 cubic feet of airspace with 3 inches of port on each side. box is tuned to 48hz. the sub is tuned to 70 something i beleive. we did play music thru it at already (before you told me this) and we got a 149.7db. we put in a hertz disc and its sweet spot was around 55hz or so if i remember right. with the hertz disc we couldnt break 146db. i beleive the sub may have just been hot after the first run with music. do you beleive that the sub will hold up okay to daily music as long as i keep it down?? im thinking about possibly adding a second DMX to get the power to a better level. what do you think of the box?? and this sub has amazing impact... im very impressed. let me know what you think. thanx
With an enclosure that is 4 cubes, you need a minimum of 48sq.in of port area. I personally would go with around 60in^2 of vent area.
Subwoofers can not be tuned....it's the enclosure that is tuned. SPL is all about testing. You have to take into consideration the transfer function of the vehicle also, not just the enclosure tuning. If you did a 149dB with music then you need to find out what frequency that 149 was at.
Also keep in mind that power (high volume) will also change the SPL reading. You may do a 149dB @ 1/2 volume, and then do a 150dB 1 click lower. Also when burping, instead of straight out burping at full tilt, you may get a better # by rolling the volume (I do).
As far as power to the (a) DMX, 5000watts for burps and 1500watts for music.