What am I doing wrong

[Marchant89]

I have tried and tried multiple enclosures and 2/3 15s I never can quite seem to get past 147db on a musical build.  Just built a new enclosure for 3 Fi ssds at 11.25 cubic feet and still can hit much past 145 on music.  Running a crescendo bc6k on 3 Fi ssds.  Here is a clip on YouTube 

 

[Marchant89]

Currently wired at 1.33 390 amp alt xs3400 secondary and a duralast agm up front voltage usually doesn’t dip below 12.5

 

[pnutz37]

I have a bunch of questions:

Is the 11.25 cubic ft Net or Gross?

What's your port area?

What frequency did you get your 147?

What do you have the enclosure tuned to?

[Marchant89]

@pnutz37Port is currently 114”,  if I did the math right 25 x 4 3/4.  I would imagine the 11.25 is without displacement.  147 is at 39hz on a sine sweep box is tuned at 32hz 

[Marchant89]

I tried port up as well no worthy changes on meter

[Marchant89]

This also maybe a really stupid question can you mix slot with aero if more port area is needed and can’t be adjusted on box?

[Never Enough Bass]

Most people chasing numbers are tuned higher I've heard but I don't chase numbers I chase not being able to breathe 

[Marchant89]

@Never Enough Basswell I thought those were related.  I’m not competing just trying to get loud

[killerc998]

11.25 with out displacement could become 7 with port, bracing, and subs accounted for.  My box is a hair under 10 before and 7.5 after tuned to 36. The lower the hrz the longer the port, and the more space gets eaten. 

[Marchant89]

Here is what it looks like