Dual SA-8 V2 tweak my box

What I HOPE to attain is a great sounding sub stage (I have two SA-8s) that gets REAL low and is real tight. What makes my goal a bit different than most requests is that I don't care about volume (SPL), I will never put a meter on it to check my SPL... I want low extension, and tight bass with very little hump in the response curve (I realize it is nearly impossible to get a flat sound from a ported box).

Vehicle : 2013 Jeep Wrangler Unlimited soft top
Location in the vehicle: back cargo area
Space available (Length x Width x Height): 37.5 x Any x Any
Subwoofer make and model: SA-8 V2
Subwoofer Size: 8 inch
Number of Subwoofers: 2
Type of Port (Kerfed, Slot, Aero, etc.): Aero would be cool but slot works too
What type of music do you like?: Acoustic bass /w Jazz, but also rap and rock.
Is your goal SPL or Everyday Music?: Good tight SQ
Tuning Freq (Hz): Whatever works best
Volume : Whatever works best

My current box has these dimensions (outside dimensions with 3/4" MDF, includes port)

37.5 x 12 x 11.5 About 1.4 CF

Port dimensions

2 x 34 x 10 (I calculate it is tuned to about 28 hz )

My impressions of my box is that it might be tuned too low and I worry about damaging the subs (over extension). The volume is fine and I can make it quite a bit louder if I like. that is not a problem. It tries to create those notes that you cannot hear but can feel, sometimes I think my enginge is stuttering and my steering wheel is shaking but I cannot hear the subs.. kinda cool. I would like to get the box much smaller and tighten up the bass a bit.

Edited September 18, 201311 yr by pat_smith1969